After you performed the freeze-thaw cycle to lyze the bacteria, you pelleted the debris using a centrifuge. You expected the supernatant to fluoresce, but the pellet also fluoresced. Two reasons why this pellet fluoresces green are:
1. Auto-fluorescence of the bacterial pellet
2. Some bacteria remained viable and active after the freeze-thaw cycle.
Auto-fluorescence refers to the natural or inherent fluorescent properties of certain biological and chemical structures, which could be cells, proteins, or other biomolecules. A bacterial pellet containing auto-fluorescent compounds may fluoresce under UV light. Some proteins, such as flavins and some riboflavin compounds, are auto-fluorescent. However, the bacterial pellet may also fluoresce due to the second reason.
The second reason why the pellet fluoresced green some bacteria may remain active and viable after a freeze-thaw cycle, especially when not adequately frozen. It means that the bacteria could still produce the fluorescent protein, causing the pellet to fluoresce.
Additionally, since the pellet contains some bacterial debris, other cellular materials could fluoresce, contributing to the pellet's fluorescence.
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Why are dideoxyribonucleoside triphosphates used during DNA sequencing?
(a) They cannot be incorporated into DNA by DNA polymerase.
(b) They are incorporated into DNA particularly well by DNA polymerases from thermophilic bacteria.
(c) Incorporation of a dideoxyribonucleoside triphosphate leads to the termination of replication for that strand.
(d) Dideoxyribonucleoside triphosphates are more stable than deoxyribonucleoside triphosphates.
(c) Incorporation of a dideoxyribonucleoside triphosphate leads to the termination of replication for that strand.
Dideoxyribonucleoside triphosphates are used during DNA sequencing because their incorporation into the growing DNA strand leads to the termination of replication for that particular strand. This happens because dideoxyribonucleoside triphosphates lack the 3'-OH group necessary for the formation of a phosphodiester bond between the nucleotides. As a result, when a dideoxyribonucleoside triphosphate is incorporated into the growing DNA strand, the DNA polymerase is unable to add any further nucleotides, leading to the termination of replication at that point. This allows for the determination of the sequence of the DNA strand.
dideoxyribonucleoside triphosphates (ddNTPs) are used in DNA sequencing because they lack the 3'-hydroxyl group present on deoxyribonucleoside triphosphates (dNTPs). When a ddNTP is incorporated into a growing DNA strand by DNA polymerase, the lack of the 3'-hydroxyl group prevents the addition of the next nucleotide. This results in the termination of replication for that strand. By using a mix of dNTPs and ddNTPs labeled with different fluorescent tags, researchers can determine the sequence of the DNA strand based on the terminated fragments generated during the sequencing reaction.
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Learning Task 6: Complete the chart. Copy this in
your answer sheet.
Answer:
Canopy
Sub-canopy
Understory
Floor of the forest
Explanation:
Canopy refers to the aboveground portion of a plant or crop such as stem, leaves, branches and flowers etc.
Sub-canopy refers to those plants which are present below the trees due to their lower size such as small trees and large shrubs etc.
Understory is the vegetation that is present on underlying layer in a forest such as herbs etc.
Floor of the forest is mainly consists of shed vegetative parts of shrubs and trees, such as leaves, branches, bark, and stems etc. These parts exists in various stages of decomposition present above the soil.
When assessing the skin of an unresponsive patient, you note that it has a bluish tint to it. This finding is called:
A) pallor.
B) flushing.
C) cyanosis.
D) mottling.
Cyanosis is a bluish tint to the skin caused by a lack of oxygen in the blood. It can be seen in an unresponsive patient, and usually appears as a bluish color around the lips and fingertips.
Here correct answer is C)
It can be caused by several conditions, including a drop in blood pressure, decreased respiratory function, or respiratory arrest. If cyanosis is noted in an unresponsive patient, urgent medical evaluation and attention are needed as it can be a sign of a serious underlying medical condition.
Treatment of the underlying condition is essential to prevent further complications. In some cases, the patient may need to be resuscitated or intubated to help restore normal oxygen levels.
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Explain results when the light intensity is 0 lux.
What type of resource is water? (select all that apply)
B
polluting resource
А
Natural resource
D
Renewable resource
с
Nonrenewable resource
1.) when Dr. bass works cases, either cold cases or ongoing investigation,, what is his role in the investigation?
2.) what role does body farm play in forensic science?
3.) what is the “sniffer”? Why could this development be important
4.) are insects a fool-proof way to determine time of death? Why or why not?
5:) why are family members or law enforcement personnel sometimes interested in having people live dr bass take a look at a cold case?
Answer:
1. When Dr. Bass works cases, either cold cases or ongoing investigation, what is his role in the investigation?
Dr. Bass’s role in an investigation is helping to identify the body and giving clues on how they died or how long they have been dead.
2. What role does the Body Farm play in forensic science?
The Body Farm plays an important role in forensic science because it has given all possible education and information on the decomposition of bodies.
3. What is the “sniffer”? Why could this development be important?
The sniffer is a mechanical device that you carry in your hand and walk across the grounds of the Body Farm. The sniffer will pick up some compounds of decomposing bodies.
4. Are insects a fool-proof way to determine time of death? Why or why not?
Insects are a great predictor of how long a body has been dead if the body is outside where the insects can get to it.
5. Why are family members or law enforcement personnel sometimes interested in having people like Dr. Bass take a look at old cases?
Family members and law enforcement personnel are sometimes interested in having someone like Dr. Bass because a forensic anthropologist can help solve and close cold cases even if decades have gone by.
N diploid wildflowers from a very large population are transplanted to a location in which they are reproductively isolated from the source population. Their heterozygosity is measured every generation. After 20 generations of random mating (and a constant number of offspring in each generation, N ), the heterozygosity of the isolated wildflowers is half of what it was at the start. What is your best guess of the value of N ? (Hint, if x≈0, then ln(1+x)≈x.) 3) a) A population with discrete generations experiences occasional surges and crashes in population size. In a fraction of generations r the population size is N
1
, and in the remaining 1− r generations the population size is N
2
. Adapt the formula for N
e
with varying population size,
N
1
1
+
N
2
1
+⋯+
N
k
1
k
(for k generations, with N
j
the population size in generation j ) to write an expression for the long-term effective population size of the population assuming that it meets all other Wright-Fisher assumptions. b) In the scenario in part (a), compute the effective population size if N
1
=1000, and N
2
= 1,000,000, and r=0.5. Repeat the calculation changing r to .1 and .01.
N = 1.386 Ne. and the value of N is a little over 100. After 20 generations of random mating, the heterozygosity of the isolated wildflowers is half of what it was at the start. The effective population size formula that can be used is N e = (1/2H) 2N / (2NH - H).
According to the given statement, Diploid wildflowers from a large population are transplanted to a location where they are reproductively isolated from the original population. Their heterozygosity is measured each generation. After 20 generations of random mating, their heterozygosity is half of what it was at the start. The value of N must be estimated. We know that the effective population size is the size of the population that would have the same rate of genetic drift as the actual population.
The effective population size (N e) can be expressed as shown below:
Ne = 4N 1 N 2 / (N1 + N 2) In this formula, N 1 and N 2 are the number of organisms in the two populations.
Thus, after 20 generations of random mating, the heterozygosity of the isolated wildflowers is half of what it was at the start, indicating that: Heterozygosity after 20 generations = 1/2
Heterozygosity at the start or Heterozygosity at the start = 2 (Heterozygosity after 20 generations). The effective population size formula that can be used here is:
Ne = (1/2H) 2N / (2NH - H) Where H is the heterozygosity at the beginning and N is the effective population size.
We can use the Hint given in the question to find that the above equation is approximately:
Ne = (1/4) N/ ln (2) So, N/ ln (2) = 4Ne or N = 4Ne ln (2) ≈ 1.386NeThus, N ≈ 1.386Ne.
The value of N is a little over 100, which is what we can expect.
After 20 generations of random mating, the heterozygosity of the isolated wildflowers is half of what it was at the start. Therefore, the effective population size formula that can be used is N e= (1/2H) 2N / (2NH - H).
Thus, N ≈ 1.386 Ne. and the value of N is a little over 100.
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And your Answer is Best management practices (BMPs) are methods that have been determined to be the most effective and practical means of preventing or reducing non-point source pollution to help achieve water quality goals. BMPS includes both measures to prevent pollution and measures to mitigate the pollution.
Answer:
Use Fertilizers Wisely.
Apply Pesticides Wisely.
Use Landscaping Practices that Prevent Erosion.
Wash Your Vehicle Wisely.
Dispose of Pet Waste.
Use and Dispose of Household Chemicals Safely.
Evaluate Existing Roads
anabaena is a cyanobacterium with two types of cells. one type of cell can carry out photosynthesis and the other type can carry out nitrogen fixation. however, the oxygen produced by photosynthesis inhibits the enzymes for nitrogen fixation. which structural characteristic allows the nitrogen-fixing cells to continue to function?
The nitrogen-fixing cells are still active thanks to specialized cells called heterocysts. Nitrogen from the atmosphere diffuses into the soil and becomes ammonia.
What cell is able to repair nitrogen?The symbiotic relationship between the water fern Azolla and the cyanobacterium Anabaena azollae is an illustration of this sort of nitrogen fixation. Cavities created at the base of Azolla fronds are colonized by Anabaena. In specialized cells known as heterocysts, the cyanobacteria fix a sizable amount of nitrogen there.
Which cell in cyanobacteria is in charge of fixing nitrogen?Upon removal of combined nitrogen from the growing media, some filamentous nitrogen-fixing cyanobacteria have the capacity to develop into specialized nitrogen-fixing cells known as heterocysts.
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What kind of development is common to chordates and echinoderms?deuterostomedorsalnotochord
One common developmental feature shared by chordates and echinoderms is the presence of a deuterostome pattern of embryonic development. Deuterostomes are a major group of animals characterized by a specific mode of early embryonic development.
In both chordates and echinoderms, early embryonic development follows a similar pattern known as radial cleavage. Radial cleavage refers to the cell division that occurs in a symmetrical manner, resulting in daughter cells aligned in a radial pattern. This differs from spiral cleavage, which is observed in protostomes (another major group of animals) and results in an oblique arrangement of cells.
During radial cleavage, the cells divide perpendicularly or parallel to the main axis of the embryo. This type of cleavage generates daughter cells that are aligned in vertical or horizontal planes, forming a radial symmetry. This symmetry is a fundamental characteristic of both chordate and echinoderm embryos.
Furthermore, both chordates and echinoderms exhibit a specific embryonic tissue layer arrangement known as triploblastic development. Triploblastic embryos possess three primary germ layers: the ectoderm, mesoderm, and endoderm. These germ layers give rise to the various tissues and organs in the developing organism.
The similarities in embryonic development between chordates and echinoderms reflect their evolutionary relationship as deuterostomes. They share a common ancestor, and these shared developmental characteristics provide insights into their evolutionary history. Despite their differences in adult morphology and ecological adaptations, the similarities in their embryonic development indicate a common ancestry and evolutionary heritage.
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which of the following describes the process?
A.) The model shows the process of active transport because the particles are moving from low to high concentration.
B.) the model shows the process of osmosis because the particles are moving from an area of low to high
C.) The model shows the process of bulk transport because particles are moving from high to low concentration.
D.) the model shows the process of diffusion because solute particles are moving from high to low concentration.
PLEASE HELP ME! PLEASE AND THANK YOU!!
The Florida panther was once considered to be a subspecies of cougars. Current scientists, however, have studied the Florida panther and removed the subspecies classification
Which of the following would explain why the classification of the Florida panther changed?
A.) New genetic evidence suggests a much closer relationship between the Florida panther and other cougars
B.) Advanced technologies have shown a large difference in cell structure between the Florida panther and other cougars.
C.) Study of their embryos shows major differences in the development of the Florida panther fetus when compared to other cougars
D.)Shared physiological features
between the Florida panther and other cougars were also found in newly discovered organisms in the world.
What is ATP ?
\( \: \)
Answer:
Adenosine triphosphate (ATP) is an organic compound and hydrotrope that provides energy to drive many processes in living cells, such as muscle contraction, nerve impulse propagation, condensate dissolution, and chemical synthesis.
Explanation:
describe the likely stages of dan’s or annie’s vision through their adolescence and adulthood, including what their ophthalmologists likely saw in their retinal exams.
The likely stages of Dan’s or Annie’s vision through their adolescence and adulthood, including their ophthalmologists likely saw in their retinal exams is they experience presbyopia
During childhood, they might have a keen eyesight and no vision problems and vision problems might start to show during their adolescence stage. Adolescents are prone to developing various eye conditions such as myopia, hyperopia, and astigmatism. Ophthalmologists may detect these conditions during routine eye exams. During early adulthood, Dan or Annie may experience presbyopia, which is a normal age-related eye condition. It happens when the lens inside the eye loses its elasticity and causes difficulty focusing on near objects.
The ophthalmologists may conduct an eye exam to detect presbyopia. In middle adulthood, they may encounter cataracts, which is a condition where the lens in the eye becomes cloudy and affects vision. In this stage, the ophthalmologist might see cloudy lenses in their eye exams. In later adulthood, they might develop age-related macular degeneration (AMD), which affects the central vision. Overall, the vision of Dan or Annie might go through different stages depending on their age and possible eye conditions and ophthalmologists will use various tests and procedures to detect and manage any vision problems.
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If you take a piece of white bread and chew it slowly for a long period of time, the flavor will become very sweet. This is due to the starch molecules in the bread being digested into smaller sugars that trigger a sweet sensation. Which substance is responsible for this breakdown
Given what we know, we can confirm that the substance which is responsible for this breakdown is Salivary amylase.
What is Salivary amylase?This is a very specific form of enzyme. This enzyme is found in the salivary glands of humans. Its sole function is to help break down the presence of starch in foods into simple sugars. Therefore, this is the substance responsible for that sweet sensation when chewing for extended periods of time.
Therefore, we can confirm that the substance which is responsible for this breakdown is Salivary amylase.
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Gene therapy is under development for potential future treatment of those with intellectual disability. if employed, when would this therapy be utilized?
d.During the prenatal period this therapy would be utilized.
Prenatal periodThe time leading up to birth is referred to as the prenatal period. During this time, a woman has greater dietary demands. A woman might not be getting enough nutrition since she may not be aware that she is pregnant. Additionally, she might overindulge in alcohol or caffeine, which could have an impact on the developing embryo or fetus. There are three stages of normal prenatal period, which last around 38 weeks total: germinal, embryonic, and fetal. Conception marks the beginning of prenatal period, which finishes with baby's birth. Your pregnancy is divided into three, 12-week trimesters because it takes around 40 weeks, or nine months, to generate a new life. New developments and modifications are brought about by each trimester.
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Gene therapy is under development for potential future treatment of those with intellectual disability. If employed, when would this therapy be utilized?
Answers:
a. In early or middle adulthood
b. Immediately after birth
c. When puberty begins
d. During the prenatal period
Cells with half the number of chromosomes as the original cell are formed by what process?
Answer:
Meiosis.
Explanation:
Humans have Diploid cells in our normal cells. However, sex cells contain Haploid cells. To make sex cells or gametes, meiosis needs to be performed(which multiplies the DNA and splits it into 4 daughter cells).
7. Explain how the structure of the arteries is related to their
functions? 3 marks
Answer:
1.Always carries blood away from the heart.
2.Carry blood under high pressure.
3. A type of supporting tissue called connective tissue provides strength.
4. Carry oxygenated blood, except for the pulmonary artery.\
5. Have thick muscular and elastic walls to pump and accommodate blood.
6. The channel in the blood vessel that carries blood - the lumen - is narrow.
Explanation:
hope this helped!
Why does Lumle receive the highest amount of rainfall?
Answer:
Lumle region recieve the highest amont of rainfall because of the presence of mountains to the north of this region that blocks the monsoon clouds originating from Bay of Bengal
Explanation:
Lumle region of Kaski ! It's because of the presence of mountains to the north of this region that blocks the moonsoon clouds orginating from Bay of Bengal.
Emigration is the process by which some species enter or migrate into an area. Group of answer choices True False
False, Emigration refers to the process by which individuals or members of a species leave or migrate away from a particular area.
Emigration refers to the act of leaving one's country or region to settle permanently in another. It is the opposite of immigration, which refers to the process of entering and establishing oneself in a new country.
Emigration occurs for various reasons, including seeking better economic opportunities, escaping political instability or persecution, pursuing higher education, or joining family members who have already settled in another country. People may choose to emigrate individually or as part of larger groups, such as families or communities.
Emigration has significant social, economic, and cultural implications for both the country of origin and the destination country. It can lead to brain drain, where highly skilled individuals leave their home country, resulting in a loss of talent and expertise. At the same time, emigration can contribute to remittances, as individuals send money back to their home country, which can have positive economic impacts.
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can you please define the term implementation.
The enormous difference in blood pressure value between the aorta and the right atrium is called the
The enormous difference in blood pressure value between the aorta and the right atrium is called the pressure gradient.
The pressure gradient refers to the change in pressure between two points in a fluid system. In the cardiovascular system, the pressure gradient is responsible for the circulation of blood throughout the body.
The aorta, which is the largest artery in the body, receives freshly oxygenated blood from the left ventricle of the heart and experiences high pressure due to the forceful contraction of the ventricle.
On the other hand, the right atrium receives deoxygenated blood returning from the body's tissues and has lower pressure.
The pressure gradient between the aorta and the right atrium ensures the continuous flow of blood from areas of higher pressure to areas of lower pressure. This gradient facilitates the movement of blood through the arteries, capillaries, veins, and back to the heart.
The pressure difference helps propel blood through the circulatory system, supplying oxygen and nutrients to the tissues and organs, and facilitating the removal of waste products.
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HELP PLZ I NEED IT:(
Come up with another myth about the classification of organisms. Then, give two to three reasons why the myth is untrue. Use complete sentences and support your answer with evidence, using your own words.
Your myth:
Fact:
Evidence:
Answer:
here ya go fam.
Explanation:
myth: parasitic worm
this worm was siad to crawl in your mouth whilst you sleep and live there without your knowing and steal half your food untill you starve th only way to get rid of it acourd ing to mytholgy is to eat salted meat., yes it will make you thirsty but the worm is smaller so it get three times and thirsty. after a few minutes go to a river or a body of water keep in mind it MUST be fresh in order for the worm to crawl out and drink.
this was false, becuase it was later discover that these parisitce worms where tape worms. you are welcome my friend.
Answer
A
Explanation:
how is a recombinant plasmid created? use the following terms in your reply: gene of interest, restriction enzyme, plasmid, and ligase.
A recombinant plasmid is created by using the following steps:
Step 1: Cut DNA using the restriction enzyme
Step 2: Inserting gene of interest into the plasmid using a ligase enzyme
Step 3: Introducing plasmid into bacteria
For the creation of a recombinant plasmid, a gene of interest is chosen, which is then cloned into a plasmid.
A plasmid is a small DNA molecule that is separated from chromosomal DNA and replicates independently in the cytoplasm of the cell.
The DNA molecule can then be used to transfer a gene of interest into another cell or organism.
Restriction enzymes are used to cut the DNA of the plasmid and the gene of interest.
The enzyme recognizes and cuts at specific sequences on the DNA molecule, leaving a sticky end.
The sticky ends of the plasmid and the gene of interest are then joined together by the action of ligase enzymes.
This creates a recombined plasmid that contains the gene of interest.
The recombined plasmid is then introduced into bacteria.
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the baseline phase in single system design is conducted during delivery of the intervention.
That's incorrect. The baseline phase in single system design is conducted before the delivery of the intervention.
In single system design, also known as single case design, the baseline phase serves as a control period where the target behavior is observed and measured without any intervention or treatment being implemented. This baseline data provides a basis for comparison to evaluate the effects of the intervention during subsequent phases of the study.
Once the baseline phase is completed and baseline data is collected, the intervention phase follows, where the specific intervention or treatment is implemented. By comparing the data collected during the intervention phase to the baseline data, researchers can determine whether the intervention has had an impact on the target behavior.
It's important to establish a stable baseline before implementing any intervention to ensure accurate assessment of the intervention's effects.
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An enzyme in potato cell caue oxygen to be produced from hydrogen peroxide. Cube of potato were incubated with hydrogen peroxide at different temperature. The number of bubble of oxygen releaed per minute were counted at each temperature. The table how the reult. Temperature/°C 15 25 35 45 55
number of bubble / bubble per minute 96 98 82 36 1
The reult ugget the optimum temperature for the enzyme i between which two value
Between 45 and 55 °C is where the enzyme functions best.
What's the ideal temperature for an enzyme?The majority of enzymes work best when the temperature is around 98.6 degrees Fahrenheit (37 degrees Celsius). Additionally, some enzymes work effectively at both high and low temperatures. For instance, while animals in desert environments have enzymes that can withstand higher temperatures, those in arctic environments have enzymes that can withstand lower ideal temperatures.
Because more substrate molecules can interact with the enzyme and make more product as a result, the reaction rate will quicken when more hydrogen peroxide is added to the mixture. More foam forms in your cup as you increase the H2O2 concentration in your reaction.
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A biologist spent many years researching the rate of evolutionary change in the finch populations of a group of islands. It was determined that the average beak size (both length and mass) of finches in a certain population increased dramatically during an intense drought between 1981 and 1987. During the drought, there was a reduction in the number of plants producing thin-walled seeds.
Which of the following statements might best explain the increase in average beak size in the finch population during the drought?
A. Finches with bigger beaks are better able to crack thick-walled seeds and produce more surviving offspring.
B. Finches with bigger beaks can attack and kill finches with smaller beaks.
C. Finches with bigger beaks possess more powerful flight muscles and are able to find more food.
D. Finches that crack large seeds develop larger beaks over time.
Answer:
i think is D iam not sure
Explanation:
.
What is maintaining constant internal conditions?
Answer:
Homeostasis
Explanation:
just search online lol
When a neural impulse reaches the end of an axon, it causes the tiny oval sacs at the end of the axon to release chemicals called __________.'
Answer:
When a neural impulse reaches the end of an axon, it causes the tiny oval sacs at the end of the axon to release chemicals called neurotransmitter.