All of the following are true of the lacrimal glands, except that they
a. produce most of the volume of tears.
b. are located in recesses in the frontal bones
c. produce mucus
d. produce lysozyme
e. produce watery secretions.
Answers
The lacrimal glands do all of the following, with the exception that they do not create lysozyme. The correct response is (d).
The aqueous layer of the tear film is produced by two pairs of exocrine glands known as lacrimal glands in the majority of terrestrial vertebrates and certain marine mammals. In humans, they are located in the lacrimal fossa of the orbit produced by the frontal bone, in the top lateral portion of each orbit. The medical word for inflammation of the lacrimal glands is dacryoadenitis. The lacrimal gland and lacrimal ducts work together to secrete tears. These canals connect to the lacrimal sac after these ducts transfer tears from the eye's surface. The tears from that sac are sent into the nose through the lacrimal duct. The gland is split into two sections by anatomists: the palpebral lobe and the orbital lobe. The palpebral section can be visible if the upper eyelid is everted. The smaller palpebral lobe is located along the inner surface of the eyelid, near to the eye. Fine interlobular ducts that connect the orbital and palpebral lobes of the gland are seen in the orbital lobe. Before the secreted fluid can reach the eye's surface, they combine to create three to five primary secretory ducts, joining five to seven ducts in the palpebral region.
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Related Questions
Explain how to distinguish different species by their DNA.
Answers
DNA analysis can be used to distinguish different species by comparing specific regions of their DNA sequences.
To distinguish different species by their DNA, scientists primarily focus on comparing specific regions of the DNA sequences that are highly variable among species. One commonly used region is the mitochondrial DNA (mtDNA), which is inherited maternally and has a higher mutation rate compared to nuclear DNA. Another region is the ribosomal RNA genes (rRNA), which exhibit variations among species.
The process typically involves extracting DNA samples from different organisms, isolating the target region of interest, and sequencing the DNA to determine the nucleotide sequence. The sequences obtained from different species are then compared to identify differences and similarities.
These differences can be used to create DNA profiles or genetic markers specific to each species. Advanced techniques such as DNA barcoding or whole-genome sequencing can provide more comprehensive information and aid in species identification.
By comparing DNA sequences, scientists can uncover genetic variations unique to different species, allowing them to distinguish and classify organisms accurately. This information is valuable in various fields, including taxonomy, conservation biology, forensic science, and evolutionary research.
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What can the nervous system do to increase muscle tension?
a. increase stimulation frequency
b. increase the number of active motor units
c. recruit larger motor units
d. All of the listed responses can increase muscle tension
Answers
which event is least likely to occur after a gene duplication event? both genes retain their function, but they are expressed in different tissues. one gene retains its function, while the other becomes a pseudogene. both genes retain their function, but they are expressed at different times. both genes become pseudogenes. one gene retains its function, while the other evolves to have a new function
Answers
Gene duplication events often occur as a result of errors during DNA replication or repair, which can create an additional copy of a gene. Alternatively, one copy may evolve to have a new function while the other retains its original function.
After a gene duplication event, the least likely scenario is for both genes to become pseudogenes. Gene duplication events often occur as a result of errors during DNA replication or repair, which can create an additional copy of a gene. In some cases, both copies of the gene may retain their original function and be expressed in different tissues or at different times. Alternatively, one copy may evolve to have a new function while the other retains its original function. While it is possible for one copy to become a pseudogene, it is unlikely that both copies would become non-functional as this would be disadvantageous for the organism. Therefore, the scenario where both genes become pseudogenes is the least likely to occur after a gene duplication event.
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How do the emergent properties of the cells of the gastrula direct embryonic development?
Answers
Gastrulation is the stage of embryonic development that occurs after cleavage. Cell division slows drastically during gastrulation, and cells are precisely rearranged to create three germ layers.
Gastrulation forms the three basic germ layers (ectoderm, endoderm, and mesoderm), which primes the system for organogenesis and is one of the most important developmental processes.
The embryo differentiates into three types of tissue during the gastrulation process: the ectoderm, which produces the skin and nervous system; the mesoderm, which produces connective tissues, the circulatory system, muscles, and bones; and the endoderm, which produces the digestive system, lungs, and urinary system.
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Consider the following two statements about succession.
Student 1:
Matthew - As succession begins, communities tend to be dominated by mostly K-selected species. As succession continues, r-selected species tend to compete better and therefore become more and more common.
Student 2:
Iman - As succession begins, communities tend to be dominated by mostly r-selected species. As succession continues, K-selected species tend to compete better and therefore become more and more common.
Which student is correct?
a. Provide a rationale for your answer (2 marks)
b. Provide a specific example of succession which includes at least one example of an r-selected and one example of a K-selected species. (1 mark)
Note - No marks are earned by simply agreeing with either Matthew or Iman
Answers
Glucose travels by facilitated
diffusion instead of simple
diffusion like other molecules.
Why?
A. The cell requires more glucose than the
process of simple diffusion can supply.
B. The glucose molecule is too large to
travel by simple diffusion.
C. Glucose moves by simple diffusion into
a cell.
curs in
mes,
out slightly
Answers
Answer:b
Explanation: it’s b because i got the question right
Answer:b
Explanation:
B. The glucose molecule is too large totravel by simple diffusion.
How do we have such versatile proteins in our body?
Answers
Answer:
They are very versatile and have many different functions in the body, as listed below: Act as catalysts. Transport other molecules. Store other molecules.
Explanation:
Which term best describes the joints at the top of your
skull?
A.) Motionless
B.) Flexible
C.) Rubbery
D.) Elastic
Answers
Answer: A
Explanation:
the joints on the top of your skull is motionless
A hammer is neeeded to pound into a board. Even if one has the nails, they cannot be used without first geting ahold of a hammer. This is similar to the genetic relathionship known as
Answers
The genetic relationship that is similar to a hammer and the nails known as between an enzyme and a substrate.
An analogy between using a hammer and nails and a genetic relationship are referring to is: a hammer is needed to pound nails into a board, just like an enzyme is necessary to facilitate the process of gene expression. Even if one has the genetic material (nails), they cannot be expressed without the help of enzymes (hammer). This is similar to the concept of gene regulation in molecular biology, where enzymes act as catalysts for specific processes, such as transcription and translation, to produce functional gene products.
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What does water vapor rising include?
Answers
Water vapor rising refers to the process by which water molecules in the air become more energetic and move more freely, causing them to rise higher in the atmosphere. This can occur as a result of several different factors, including:
1. Temperature: Water vapor will tend to rise in the atmosphere if it is warmer than the surrounding air. As the water molecules absorb heat energy, they become more energetic and are able to move more freely, causing them to rise.
2. Humidity: Water vapor will also tend to rise in the atmosphere if the air is already saturated with moisture. When the air becomes saturated, any additional water vapor that is added to it will be less likely to stay in the air and will instead tend to condense and fall to the ground.
3. Pressure: Water vapor will also tend to rise in the atmosphere if the air pressure is lower at higher altitudes. As the water molecules rise and the air pressure decreases, they become more energetic and are able to move more freely, causing them to rise further.
Overall, water vapor rising is an important process in the Earth's atmosphere that helps to distribute heat and moisture around the planet and to regulate the Earth's climate.
Just a random question cuz why not? Brainliest to whoever answers correctly!
What is the difference between biology and chemistry?
Answers
Answer:
Biology is science about life and how it survives, breeds, and dies,
Whereas chemistry is about chemical concoctions such as sulfuric acid.
Biology- plants and human body
Chemistry- elements and reactions that make up and result in plants and the formation of the human body
most monocot are easily recognised by their?
Answers
Answer:
Flowering plant
vascular tissue in the stem
Explanation:
Explanation:
..........................................
need answers 30 points
Answers
Answer:
c
Explanation:
the others dont use imagination
what does the term bite-wing refer to? what size receptor is recommended for use with the bite-wing technique in the adult patinet
Answers
The term "bite-wing" refers to a type of X-ray imaging technique used in dentistry.
This technique involves positioning a dental X-ray receptor between the patient's upper and lower teeth.
The patient is then asked to bite down gently on the receptor to hold it in place, creating a “bite-wing” image of the teeth and surrounding structures.
The size of the receptor recommended for use with the bite-wing technique in adult patients is generally a size 0. The size 0 receptor is slightly larger than the size 1, but slightly smaller than the size 2. This size is used as it provides adequate coverage of the area while still allowing the patient to bite down on the receptor comfortably.
To achieve an optimal bite-wing X-ray, the patient should be instructed to keep the molars in occlusion and not move the jaw.
The technician should also ensure that the receptor is placed in the correct position and at the correct angle. The X-ray source should then be centered to the receptor, and an exposure should be taken from each side of the mouth. This will allow for the most comprehensive view of the area.
The bite-wing technique is a very useful imaging method that is used to diagnose and monitor a variety of oral health conditions.
It is particularly useful for assessing the presence of periodontal disease, caries, and various types of dental restorations. This technique is non-invasive, comfortable for the patient, and cost-effective, making it an ideal imaging method for use in the dental practice.
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If the cells in your body are being attacked and damaged, yoou can infer that microbes ___________
a
are living the dry regions of your body
b
that make you sick have entered your body
c
are working to break down the food you eat
d
from your mother have been passed on to you
Answers
Answer:
b. That make you sick have entered your body.
If the cells in your body are being attacked and damaged, it is likely that microbes that make you sick have entered your body. Microbes such as bacteria, viruses, fungi, and parasites can invade the body and cause infections, which can lead to damage and destruction of cells. This can result in a range of symptoms, depending on the type and severity of the infection.
a thick band of bone forms around a broken bone as it heals.in time,the thickend band dissapears.explain how this extra bone can disappear over time
Answers
Answer: Explain how this extra bone can disappear over time. This extra band of bone probably disappears over time due to the action of osteoclasts. Osteoclasts are responsible for breaking down bone and releasing the components of the bone (calcium and phosphorus) into the bloodstream.
Explanation:
10. What's an Environmental Impact Statement (EIS)?
O A. It's a document used as evidence in court to prosecute polluters.
O B. It's a document used to communicate to the public about the state of the environment.
C. It's a document that must be submitted annually by any company with a permit to demonstrate that they're following regulations.
O D. It's a document that describes the effects proposed activities might have on the environment.
Answers
Answer: D. A document that describes the effects proposed activities might have on the environment
Explanation: An Environmental Impact Statement describes and analyzes a proposed action which may have a significant impact on the environment. I don’t know how to explain it any better.
Which three structures are found in both prokaryotic and eukaryotic cells?
1.cytoplasm, endoplasmic reticulum, DNA
2.ribosomes, DNA, cytoplasm
3.nucleus, cell wall, cell membrane
4.cell membrane, endoplasmic reticulum, ribosomes
Answers
Answer:
It would be >>2.ribosomes, DNA, cytoplasm
What 7 traits did Mendel study in peas?
Answers
Seven traits that Gregor Mendel studied in peas include:
pea shape (wrinkled or round),pea color (yellow or green),flower color (white or purple),pod shape (inflated or constricted),pod color (yellow or green),position of flowers (terminal or axial), andplant size (dwarf or tall).Gregor Mendel (20 July 1822–6 January 1884) was an Austrian biologist that was widely known for his pea plant experiments. Mendel is often called the father of genetics.
He studied the inheritance of seven different traits in peas, which included height, flower and seed colors, and seed shape. To do so, Mendel first established pea lines with two different forms of a trait, such as yellow vs. green color. For generations, Mendel grew these lines until they were pure-breeding (which meant they always produced offspring identical to the parent), and then he bred them to each other and observed how the traits were inherited.
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Which gas is most prevalent in the Earth's atmosphere?
Nitrogen
Oxygen
Argon
Carbon dioxide
Answers
Answer:
Nitrogen
Explanation:
The atmosphere contains many gases. The most abundant gas in the atmosphere is nitrogen and oxygen second. Argon is a insert gas which makes it the third most abundant gas in the atmosphere.
A. 16
B. 32
C. 38
D. 48
Answers
Answer:
C. 38
Explanation:
Between A and T there are 2 hydrogen bonds.
Between G and C there are 3.
assume interference between regions (a-b and b-c) is 40%. when an f1 individual produces gametes, what proportion of its gametes would have abc genotype?
Answers
The proportion of gametes with the abc genotype in the F1 individual, considering a 40% interference, is 2.16 (or 2.1600 as a decimal fraction).
To determine the proportion of gametes with the abc genotype in the F1 individual, let's solve step by step:
Step 1: Determine the possible combinations of alleles for the F1 individual based on the parental genotypes AABBCC and aabcc. The F1 individual will have the genotype AaBbCc.
Step 2: Calculate the recombination frequencies between the gene regions:
The distance between genes A and B is 20 mu.
The distance between genes B and C is 30 mu.
Step 3: Apply the interference of 40% to the recombination frequencies. Interference refers to the reduction in the frequency of double crossovers compared to the expected frequency based on independent assortment. To account for this, we multiply the recombination frequencies by (1 - interference).
For the region between genes A and B, the adjusted recombination frequency is:
Recombination frequency (AB) = 20 mu × (1 - 0.40) = 12 mu
For the region between genes B and C, the adjusted recombination frequency is:
Recombination frequency (BC) = 30 mu × (1 - 0.40) = 18 mu
Step 4: To determine the proportion of gametes with the abc genotype, we multiply the adjusted recombination frequencies together, as the occurrence of recombination events between different regions is independent.
Proportion of gametes with abc genotype = Recombination frequency (AB) × Recombination frequency (BC)
= 12 mu × 18 mu = 216 mu²
Step 5: Convert the proportion of gametes to a decimal fraction by dividing by the total possible recombination units (mu²) for the entire chromosome.
Total recombination units for the chromosome = (20 mu + 30 mu) × 2 = 100 mu²
Proportion of gametes with abc genotype = 216 mu² / 100 mu² = 2.16
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The question is -
In fish, genes A, B, and C are on chromosome 5. The map of genes A, B, and C is:
A----------------------------B-----------------------------------------C
20mu 30mu
You cross an individual with genotype AABBCC to an individual with genotype aabcc, and F1 progeny are collected.
Assume interference between regions (a-b and b-c) is 40%. when an f1 individual produces gametes, what proportion of its gametes would have abc genotype?
All of the members of the same species in the same place at the same time that can interbreed.
O genepool
O population
O community
O species
Answers
Answer:
Genepool
Explanation:
I hope this helps
what cellular structure is involved in photosynthesis
Answers
Answer:
Chloroplast
Explanation:
*Chloroplast*
Because it is the cellular structure (part of a cell) that contain chlorophyll for trapping sunlight.
The cellular structure involved in photosynthesis is the chloroplast.
Chloroplasts are membrane-bound organelles found in the mesophyll cells of plants, algae and some protists. They are the site of the light-dependent reactions of photosynthesis, where light energy is captured and converted into chemical energy in the form of ATP and NADPH.
Chloroplasts contain a pigment called chlorophyll, which absorbs light and transfers the energy to other molecules in the chloroplast. The chloroplast also contains thylakoid membranes, which are stacked and organized into grana, where the light-dependent reactions take place.
Chloroplasts play a crucial role in producing oxygen and organic molecules that are essential for the survival of plants and other photosynthetic organisms. They are also the source of energy for most life on Earth, as they are the starting point for the transfer of energy through the food chain.
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1.Write down whether the statements are true or false.
1= 5
A. When H2O(g) is cooled to 100 degree Celsius it condenses to become ice.
B. Impure substances have fixed boiling and melting point.
C. The particles of liquid have more kinetic energy than the particles of solid.
D. The temperature when the evaporation of water occurs is 100 degree celsius.
E. Boiling occurs slowly
2. Answer the following question
4.5 x 2= 9
5x
Answers
Water condenses into liquid form when it is cooled to 100 degrees Celsius.
Impure compounds lack constant melting and boiling points.
Statement :The kinetic energy of liquid particles is higher than that of solid particles.
When water evaporates, the temperature is 100 degrees Celsius.
Water steadily boils as it transforms from a liquid to a gas.
What does melting point mean?Melting point is the temperature at which ice begins to turn into liquid water.
Describe kinetic energy.Kinetic energy is the energy a body expends when in motion.
The temperature is the degree to which a body is hot or cold is known as its temperature.
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Describe two types of living things that biologists could study. Think about types of living things that are not in the ocean — what categories of living things are on land?
Answers
Answer:
Following are the two types of living things that biologists could study:
1) Animals
2) Plants
Explanation:
As we know plants and animals are the most important organisms. Animals has further categories of living things are on land:
1) Birds
2) Mammals
3) Reptiles
4) Amphibians
Fishes are not included because they are in water but not on land.
you do a mutant hunt to screen for histidine mutants in a fungus population and isolate 15 mutants. you find that the histidine phenotype is recessive in mutants 1-14, but dominant in mutant 15. you then organize the mutants based on complementation groups (groups that will complement each other) a) describe how you would determine the complementation groups for each mutant. b) explain what it means if two mutants are in the same complementation group as opposed to in different groups
Answers
A complementation group is made up of mutants and meaning of same complementation group can be described by an experiment of biosynthetic pathway of histidine.
The complementation test is used to determine whether the mutations are in different genes or the same gene.
a) The biosynthetic pathway of histidine is the subject of our experiment.
Histidine biosynthesis is a series of steps mediated by various enzymes whose codes are encoded by various genes. The next step in the pathway is determined by the product of one gene.
Therefore, mutants with a gene X mutation will be unable to synthesize histidine. Histidine is necessary for the growth of those mutants.
+ refers to prototrophs that can grow in minimal media; - refers to auxotroph that need histidine to grow (MM). When mutant A1 mated with itself, the resulting diploid remains auxotrophic due to its homozygous status for the defective allele.
The prototrophy was restored when mutant A1 and mutant A2 were mated, complementing each other.
The same holds true for the other mutants.
This allows us to determine which his-phenotype is recessive in mutants 1 through 14.
b) If a mutant has a mutation in gene X that codes for an enzyme A and another mutant has a mutation in gene Y that codes for an enzyme B. Since both genes are necessary for the histidine biosynthesis pathway, neither mutant can make histidine on its own. However, when mutations are combined, a mutant with a normal copy of gene X on one chromosome will produce ENZYME A, while a mutant with a mutant copy of ENZYME 2 They are grouped together as the same complementation.
c) Mutants that do not complement one another will also be placed in the same group (group 1): A1, A3, A5 group 2, A2, A4, A6 group 3, A7, A8 group 4, A9, and A10.
This makes a total of four complementation groups.
You do a second mutant hunt to screen for histidine mutants and isolate 15 mutants. You find that the his- phenotype is recessive in mutants 1-14, but dominant in mutant 15. You then organize the mutants based on complementation groups
a) Describe the experiment that you performed and the results that you obtained which allowed you to determine that the his-phenotype is recessive in mutants 1-14, but dominant in mutant 15
b) Describe how you would determine complementation groups for each of your mutants and explain what it means if two mutant are in the same complementation group as opposed to in different complementation groups
c) The following is the result of a complementation assay. Here (-) represent no growth on minimal media and (+) represent growth on minimal media. Based on the information provided, arrange the mutants into complementation groups. A1. A2 A3 A4 A5 A7 A8 A9 A10.
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use the drop-down menu to complete the difference between prokaryotic cells and eukaryotic cells is that a eukaryotic cell contains cytoplasm, while a prokaryotic cell does not.
Answers
The difference between prokaryotic cells and eukaryotic cells is that a eukaryotic cell contains a nucleus, while a prokaryotic cell does not.
Eukaryotic cells are more complex and contain membrane-bound organelles, such as mitochondria and the endoplasmic reticulum, which are absent in prokaryotic cells.
Finally, eukaryotic cells are typically larger than prokaryotic cells.
Here's a summary of the differences between prokaryotic cells and eukaryotic cells:
Prokaryotic cells:
Do not have a nucleus, Do not have membrane-bound organelles, Smaller in size, Examples include bacteriaEukaryotic cells:
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Which of the following is a FALSE statement?
Select one:
RNA contains the nitrogen base cytosine.
RNA contains the nitrogen base guanine.
RNA contains the nitrogen base thymine.
RNA contains the nitrogen base uracil.
Answers
Answer:
3rd one
Explanation:
because only DNA contain thymine and in RNA it contains uracil.
The solar or energy coming from the (1)_enters the earths atmosphere through electromagnetic (2)_. The sunlight if form of (3)_energy that when hits objects here on Earth transform into (4)_energy or thermal energy and increases the objects (5)_
Answers
Electromagnetic (2) radiation is the mechanism via which solar energy, or energy from the Sun, (1) enters the atmosphere of the Earth. The sun is a source of (3) Solar energy, and when it strikes objects on Earth, it changes into (4) Electrical energy or thermal energy, raising their (5) temperature.
Electromagnetic waves, or radiation, carry energy from the sun to Earth. Infrared and visible light make up the majority of the energy that travels through the upper atmosphere and reaches the surface of the Planet.
This light is primarily visible spectrum light. Most of the energy that reaches the Earth's surface is absorbed; just a little amount is reflected. The atmosphere and the surface of the Earth collectively absorb around 70% of incoming radiation.
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Correct Question:
The solar energy or energy coming from the (1) ________ enters the Earth’s atmosphere through Electromagnetic (2) ___________. The sunlight is a form of (3) __________ energy that when hits objects here on Earth transforms into (4) _________ energy or thermal energy and increases the objects’ (5) ______________.