Suggest one advantage and one disadvantage of
using a dichotomous key to identify something.
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Related Questions
4.4 Emile did an experiment to compare the rate of respiration in woodlice (small crustaceans) and maggots (the larvae of houseflics). The diagram shows how he set up his experiment. Limewater is a clear liquid. It goes cloudy when carbon dioxide is present. bung test tube gauze platform live maggots limewater A B live woodlice A 6 minutes B 6 minutes C 8 minutes D 9 minutes C a Suggest why Emile used four tubes in his experiment, rather than two. b Describe three variables that Emile needed to keep the same in his experiment. c Emile timed how long it took for the limewater to go cloudy in each tube. These are his results. D Draw a results table, and write in Emile's results. d Write a conclusion that Emile can make from his results. [2] [3] BE [1]
Answers
a) Emile used four tubes to compare the rate of respiration in woodlice and maggots for a more accurate and reliable comparison.
b) The three variables Emile needed to keep the same were temperature, amount of limewater, and time.
c) Results Table:
Tube | Time (minutes)
--------------------------
Maggots A | 6
Maggots B | 6
Woodlice A| 8
Woodlice B| 9
d) Emile can conclude that woodlice have a slower rate of respiration than maggots based on the longer time taken for the limewater to go cloudy.
a) Emile used four tubes in his experiment instead of two to have a comparison between woodlice and maggots.
By having multiple tubes for each organism, he can ensure that any differences observed in the rate of respiration are due to the organisms themselves and not variations in the experimental setup or conditions.
b) The three variables that Emile needed to keep the same in his experiment are:
1. Temperature: The temperature should be consistent throughout the experiment as it can affect the rate of respiration.
2. Amount of limewater: Emile needs to ensure that equal amounts of limewater are added to each test tube to maintain consistency.
3. Time: Emile needs to measure the time consistently for each tube to ensure accurate comparison of the rate of respiration.
c) Results Table:
Tube | Time taken for limewater to go cloudy (minutes)
----------------------------------------------------------
Maggots A | 6
Maggots B | 6
Woodlice A | 8
Woodlice B | 9
d) Conclusion: Emile can conclude from his results that woodlice have a slower rate of respiration compared to maggots.
This conclusion is based on the observation that it took woodlice 8 to 9 minutes for the limewater to go cloudy, while maggots only took 6 minutes.
The difference in the time taken suggests that woodlice have a lower production of carbon dioxide, indicating a slower rate of respiration compared to maggots.
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In tomatoes, tall vine (T) is dominant to dwarf vine (t), and red fruit (R) is dominant to yellow fruit (r).
A gardener crosses a dihybrid tall tomato plant bearing red fruit with a true-breeding dwarf tomato plant with yellow fruit.
1. Describe the possible phenotypes and genotypes of the plants. Responses should include expected phenotype ratios. Explain your reasoning as needed.
2. If 100 of these tomato plant offspring were planted, how many plants would you predict you would find of each phenotype.
Please help
Answers
Answer:
Possible genotypes: TtRr, Ttrr, ttRr, ttrr
Possible phenotypes: Tall with red fruit, tall with yellow fruit, dwarf with red fruit, darf with yellow fruit
Number of plants with the phenotype:
Tall with red fruit - 25 plants
Tall with yellow fruit - 25 plants
Dwarf with red fruit - 25 plants
Darf with yellow fruit - 25 plants
Explanation:
To find the genotypes create a punnett square like the one in the image
To find the phenotypes examine the genotypes and detemine if they carry a dominant allele for the trait, if they have at least one dominant allele then the dominant trait that will be expressed, if they have two recessive alleles then the recessive trait will be expressed
To find how many plants that will have a phenotype if 100 plants were planted divide the number squares that have a particular phenotype from the punnett squares and divide that number by the number of total squares. Then multiply by 100
4÷16×100 = 25
The structure labelled A was marked ×10
and structure B was marked x20. How
much bigger did these structures make
the cells appear?
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Answer:
The structure labelled a was marked 10 and structure b was marked 20 how much bigger did these structures make the cells appear?
cell wall is secreted by:
(a)nucleoplasm (b)golgi complex (c)ribosomes (d)protoplasm
Answers
Answer:
A
Explanation:
Human cells break down glucose to release the energy stored in its bonds. Which of these statements is false?
A. Large chains of glucose molecules can be broken apart to form other molecules.
B. Glucose can be assembled into larger molecules.
C. The atoms of glucose molecules can be combined with other elements to form different molecules.
D. Maltose is not useable if it is broken down further.
Answers
Maltose is useable if it is broken down further cause it provides energy or stored as glycogen. So the correct answer is option 'D'
What is Maltose?
Maltose which can be described as maltobiose or malt sugar, is an intermediate sugar form by the action of amylase catalyzed hydrolysis of starch which is a disaccharide, specially formed from two units of glucose bond with an α(1→4) bond. which when broken down further provides energy or stored as glycogen.
What is glycose?
Glycose can be said to be the simplest type of carbohydrate (carb), and a group of carbohydrates known as simple sugars (monosaccharides) which is the main type of sugar in the blood and is one of the major sources of energy for the body's cells.
What is glycose made up of?
Glucose is majorly made up of three elements which are
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C6H12O6 + 602 --> 6CO2 + 6H20 + ATP
In the reaction above, CoH12O6 and 602 are called the
Answers
Answer:
Reactants
Explanation:
In the reaction:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
The reaction is a metabolic reaction that produces energy from the breakdown of glucose when it reacts with oxygen.
In the reaction C₆H₁₂O₆ and O₂ are the reactants.
These are the raw materials need for the reaction to proceed in the right direction successfully.
On the right hand side, we have the products.
a phenotypically normal woman marries a man who is heterozygous for cmt disease, an autosomal dominant disorder. they have a son who has cmt disease. what were the chances he would inherit the disease? (if necessary, draw a punnett square to determine the answer.)
Answers
In the case of a phenotypically normal woman marrying a man who is heterozygous for CMT disease, an autosomal dominant disorder, the chances that their son would inherit the disease are 50%.
The woman in this case is phenotypically normal, which implies she does not have CMT illness. The man has CMT disease and is heterozygous for it, which means he has one normal copy and one mutant copy of the gene.
The boy acquired one copy of the mutant gene from his father, giving him a 50% chance of acquiring the condition.
Thus, their son has a 50% risk of inheriting the condition.
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A current leading hypothesis about the first system of inheritance in the earliest life forms involves
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The current leading hypothesis about the first system of inheritance in the earliest life forms involves RNA molecules.
This hypothesis suggests that RNA, specifically ribonucleic acid, played a crucial role in early forms of life. RNA is capable of both storing genetic information and catalyzing chemical reactions, making it a plausible candidate for an early genetic system. It is believed that RNA molecules could have acted as both genetic material and enzymes, allowing for self-replication and the transmission of genetic information. This hypothesis is supported by experimental evidence and provides insights into the origins of genetic inheritance in primitive life forms.
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Discuss the importance of international agreements in the
management of biomedical waste.
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International agreements play a vital role in managing biomedical waste by establishing common standards and promoting collaboration between countries. They ensure effective waste management, protect public health, and preserve the environment on a global scale.
International agreements play a crucial role in the management of biomedical waste due to the global nature of the issue and the potential risks it poses to public health and the environment. These agreements serve as frameworks for countries to establish common standards and guidelines for the proper handling, treatment, and disposal of biomedical waste.
Firstly, international agreements facilitate information exchange and knowledge sharing among countries, enabling them to learn from each other's experiences and best practices. This helps in the development and implementation of effective waste management strategies, ensuring the protection of human health and the environment on a global scale.
Secondly, these agreements promote cooperation and collaboration between countries, fostering a coordinated approach in addressing the challenges associated with biomedical waste. They encourage the sharing of resources, technology, and expertise, which is particularly important for developing countries with limited resources and infrastructure for waste management.
Furthermore, international agreements enhance accountability and compliance by establishing monitoring mechanisms and reporting requirements. They encourage countries to regularly assess and improve their waste management systems, ensuring adherence to international standards and guidelines.
Overall, international agreements serve as essential tools in promoting uniformity, cooperation, and accountability in the management of biomedical waste, contributing to the global effort to mitigate its adverse impacts.
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How does the fossil record support the theory that all continents used to be connected?
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Multicellular organisms contain organ systems. Which of the following BEST describes the organs in an organ system? *
Answers
Answer:
The organs in an organ system work together to perform a specific function.Explanation:
which enzyme is more highly processive? group of answer choices dna polymerase iii dna polymerase i rna polymerase ii helicase topoisomerase
Answers
Among the options provided, DNA polymerase III is generally considered to be more highly processive than DNA polymerase I, RNA polymerase II, helicase, and topoisomerase.
Processivity refers to the ability of an enzyme to remain associated with its substrate for an extended period during catalysis without dissociating. It is often measured by the number of nucleotides added or processed per binding event before the enzyme dissociates. DNA polymerase III is the primary DNA polymerase involved in DNA replication in prokaryotes.
It exhibits high processivity, meaning it can add numerous nucleotides (up to thousands) to the growing DNA strand without dissociating from the template DNA. DNA polymerase III achieves this high processivity through its sliding clamp, which helps it stay attached to the DNA template.
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expression, purification and testing of lanthanide-dependent enzymes in methylorubrum extorquens am1. methods enzymol. 650:97-118. doi:10.1016/bs.mie.2021.02.001.
Answers
A systematic method for Methylorubrum extorquens AM1, a model methylotrophic bacteria, to grow in order to express enzyme purification and testing lanthanide-dependent enzymes.
Growth is optimized for both scaled-up batch cultivation for enzyme purification, enabling in vitro enzymatic research, and high-throughput phenotypic characterization, aiding in vivo studies. It has been established that both methods are crucial for comprehending the structure and activity of these enzymes. In order to identify lanthanide dependence, expression systems have been developed to produce enzymes both with and without lanthanide metals. The procedure outlined here is anticipated to hasten the identification of new lanthanide-dependent enzymes and our comprehension of the function of these metals in the larger biological system.
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he largest number of neurons within the brain and spinal cord are _____; they are responsible for the central nervous system's complex internal communications system and mediate between inputs and outputs.
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The largest number of neurons within the brain and spinal cord are interneurons. Interneurons are responsible for the central nervous system's complex internal communications system and mediate between inputs and outputs.
The largest number of neurons within the brain and spinal cord are interneurons. Interneurons receive impulses from the sensory neurons and process this information, as well as activate motor neurons, causing muscles and glands to function. They mediate between inputs and outputs and make up 90% of the neurons in the nervous system.
Interneurons are responsible for the complex internal communications system of the central nervous system. They mediate between inputs and outputs, and receive impulses from the sensory neurons and activate motor neurons, which cause muscles and glands to function. They make up 90% of the neurons in the nervous system.
Interneurons are the largest number of neurons within the brain and spinal cord. They are responsible for the complex internal communications system of the central nervous system and mediate between inputs and outputs, making up 90% of the neurons in the nervous system.
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write the scientific name of the catbird?
Answers
Answer: Dumetella carolinensis
Explanation:
PLS HELP!!! I will mark brainliest!! What is a question about volcanoes that could be answered by doing an experiment??? I canNOT create a model.
Answers
Answer:
what chemical reaction causes a volcano to erupt?
Explanation:
hope that helps :)
how do a ribosome, a mrna, a SRP, a polypeptide, and a rough endoplasmic reticulum relate?
Answers
The protein synthesis process involves the ribosome, messenger RNA (mRNA), signal recognition particle (SRP), polypeptide, and rough endoplasmic reticulum (RER).
How do ribosome, mRNA, SRP, Polypeptide, and rough endoplasmic reticulum relate with each other?
The genetic information is transferred from the DNA in the nucleus to the ribosome in the cytoplasm by the mRNA, which acts as a template for the production of proteins.
In a process known as translation, the ribosome reads the mRNA and uses it as a template to create a polypeptide chain.
Getting newly synthesized polypeptide chains to the RER for further processing relies heavily on the SRP.
The translation process is halted until the ribosome can be transported to the RER because it binds to a particular signal sequence on the polypeptide chain.
The RER has a rough appearance because it is a membrane-bound organelle that is dotted with ribosomes.
Newly synthesized proteins, particularly those destined for secretion or membrane insertion, are processed and modified by it.
The ribosome creates the polypeptide chain by threading it through a channel in the RER membrane, where enzymes and chaperones further modify it.
In a nutshell, the ribosome reads the messenger RNA and creates a polypeptide chain that the SRP recognizes and binds.
The ribosome is directed to the RER by the SRP, where the polypeptide chain undergoes additional modification and processing before being transported to its final destination.
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atrial fibrillation, a dangerous form of irregular heartbeat is associated with the intake of _____.
Answers
Answer:
Palmitic acid
Explanation:
Intake of palmitic acid is associated with atrial fibrillation.
Palmitic acid - is a saturated long-chain fatty acid and a straight chain saturated fatty acid with a 16-carbon backbone. Palmitic acid is found naturally in palm oil and palm kernel oil, as well as in butter, cheese, milk and meat. It is a conjugate acid of a hexadecanoate.
Hexadecanoate - is a long-chain fatty acid anion that is the conjugate base of hexadecanoic acid (palmitic acid).
A flower made up of one carpel is referred to as
A: Apocarpous
B: monocarpous
C: monogamous
D: pericarpous
E: syncarpous
Answers
Answer:the answer is d
Explanation:
explain how using antibodies only when essential can limit the development of resistance bacteria such as mrsa
Answers
Answer:
It can be prevented by minimising unnecessary
prescribing and overprescribing of antibiotics,
the correct use of prescribed antibiotics, and
good hygiene and infection control.
neurexins are cell adhesion proteins that are important for connecting neurons at the synapse. mammals have 3 neurexin genes. however, 2000 forms of neurexin proteins are found in cells where they play a role in determining synapse specificity. what mechanism most likely underlies this diversity?
Answers
Neurexins and neuroligins have emerged as central organizing molecules for excitatory glutamatergic and inhibitory GABAergic synapses in the mammalian brain.
Functions as a cell adhesion molecule and bridges the synaptic cleft. Surprisingly, both partners can trigger the formation of hemisynapses.
Neuroligins induce presynaptic differentiation and neurexins induce postsynaptic differentiation. Recent protein interaction assays and cell culture studies demonstrate the selectivity of function conferred on either partner by alternative splicing. Insertion of β-neurexin into site 4 selectively promotes GABAergic synaptic function, whereas insertion of neurolysin-1 into site B selectively promotes glutamatergic synaptic function. Although early knockdown and knockout studies suggest that neurexins and neuroligins play important roles in synaptic transmission, particularly GABAergic synapses, assessing the in vivo function of these complex protein families needs further research.
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taj incorrectly states that autographs are also known as consumers that need to feed on other organisms, including plants and animals, to gain energy. which of the following best describes consumers that feed on other organisms such as plants and animals for energy?
A. carnivores
B. trophic levels
C. heterotrophs
D. herbivores
Answers
Herbivores best describes consumers that feed on other organisms such as plants and animals for energy.
What do you mean by herbivores?A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage or marine algae, for the main component of its diet.
Many herbivores have large, dull, flat teeth. These teeth are excellent for chewing and breaking down tough plant material. Carnivores have sharp, narrow teeth that are better for biting and tearing flesh. However, some herbivores also have strong, sharp teeth.
Examples of large herbivores include cows, elk, and buffalo. These animals eat grass, tree bark, aquatic vegetation, and shrubby growth. Herbivores can also be medium-sized animals such as sheep and goats, which eat shrubby vegetation and grasses.
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Which of the following is NOT a characteristic of protozoans
a. break down plant matter
b. can cause a disease
c.can live in red blood cells
d. Ingredient in lotion
its a science question
Answers
Answer:D
Explanation: Protozoans are a single-celled microscopic animal of a group of phyla of the kingdom Protista, such as an amoeba, flagellate, ciliate, or sporozoan.
Protozoans play important roles in the fertility of soils. By grazing on soil bacteria, they regulate bacterial populations and maintain them in a state of physiological youth— in the active growing phase. This enhances the rates at which bacteria decompose dead organic matter.
18. Yo
tra
7. A plant, for instance, that carries both a
dominant and a recessive allele for a certain
trait is said to be
A Dominant
B Hybrid
с Pure
D
Recessive
Answers
Answer:
Dominant because you need one dominant for it to be dominant, but two recessives to be recessive.
Hope this helps. :)
Explanation:
Directions: Look at the graph Match the letters in the graph to the sentences below
Graph of Ruth's Motion
Distance (miles)
1000
1200
1000
800
600
200
0
5
20
25
10 15
Time (miles)
10. Ruth stops for 10 minutes to speak to a friend,
a. Line A
b. Line B c. Line C d. All lines
11. She walks at a constant speed of 80 m/min
a Line A
b. Line B
c. Line C
d. No line
Answers
Answer:
11.c
12.A
Explanation:
ihope that works
___, an attitude of doubt, keeps scientists from accepting faulty ideas
and may lead to new understandings.
G
Answers
Answer:
skepticism
Explanation:
Skepticism It involves having critical thinking about scientific fields, performing experiment and practising science due to skills acquired in the field over time.
skepticism re move complacency or bias in science, it leads to achieving good results that show the real world as closely as possible.
It involves questioning how true a a research result is, the study and research itself.
Which are characteristics of carbon? Check all that apply.
covalent bonding
water soluble
generally in nonelectrolytes
low melting point
rapid reaction rate
forms a variety of compounds
Answers
The various characteristics of carbon include that it shows covalent bonding, generally is in non-electrolytes, has a low melting point and forms a number of compounds.
The correct options are the option number 1, 3, 4 and 6.
Carbon basically has four valence electrons which are present in its outermost energy level, and in order to achieve a stable electron configuration, carbon needs to either gain or lose four electrons, which is not energetically favorable.
Therefore, carbon forms covalent bonds by sharing its valence electrons and this why it also forms a large number of compounds with a number of elements. Carbon also has a low melting point and is generally in non electrolytes.
Hence, the correct options are 1,3,4 and 6.
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Suppose you were interested in studying teen SU. Which sociological theoretical perspective or perspectives (from the module one chapters) would you use? Explain your answer as to why you would use them and how you would use them.
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To study teen SU, I would use both the Functionalist and Conflict perspectives.
What constitutes these perspectives?The Functionalist perspective emphasizes the ways in which social institutions, such as families and schools, help to maintain social stability and order. In the context of studying teen SU, I would use this perspective to examine the functions that teen SU serves in society and how it contributes to maintaining the status quo.
The Conflict perspective emphasizes power struggles and the ways in which dominant groups in society maintain their power over subordinate groups. In the context of studying teen SU, I would use this perspective to examine how power dynamics between teens and adults play out in the context of SU.
Using both of these perspectives would provide a comprehensive and nuanced understanding of teen SU, including its social functions and the power dynamics at play.
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Can a pelican survive in the Amazon rainforest ?
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The density of solid aluminum is 2.70 g/cm3. If a 1g piece of aluminum is dropped in a cup of water, what will happen to the aluminum? (The density of water is 1.00 g/cm3.) It will sink to the bottom. It will float to the top. It will hover in the middle. It will move up and down.
Answers
Answer:
The correct answer is: It will sink to the bottom
Explanation:
Density is the mass of substance per volume. If we compare the density value of water (1.00 g/cm³) and aluminum (2.70 g/cm³), we can see that:
density aluminum > density water
(2.70 g/cm³) > (1.00 g/cm³)
Thus, when we put solid aluminum in a cup of water, the aluminum will have more weight than surrounding water, so it will drop to the bottom of the cup.
If a 1g piece of aluminum is dropped in a cup of water It will sink to the bottom. Therefore option A is correct.
When comparing the densities of two substances, the denser substance tends to sink while the less dense substance tends to float.
In this case, the density of aluminum (2.70 g/cm3) is greater than the density of water (1.00 g/cm3). Therefore, when the 1g piece of aluminum is dropped into the cup of water, it will be denser than the water and sink to the bottom of the cup.
Option B, C, and D are incorrect because they describe scenarios where the aluminum would need to be less dense than water in order to float or hover in the middle.
Therefore option (A) It will sink to the bottom is correct.
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