What are examples of positive and negative control of the lac operon? Answer 1. Lactase, which breaks down lactose, is an example of positive control, and cAMP, which binds to CRP, is an example of negative control. 2. cAMP, which binds to CRP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control. 3. Lactase, which breaks down lactose, is an example of positive control, and glucose, which reduces cAMP, is an example of negative control. 4. Glucose, which reduces cAMP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control.

Answers

Answer 1

Answer:

4. Glucose, which reduces cAMP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control.

Explanation:

During positive control, the presence of Glucose results in the repression of expression of lac operon. This concept is known as catabolite repression. During negative control, the lac genes are switched off by repressor when the inducer is absent (indicating the unavailability of lactose). But when lactose is present, lac binds the repressor protein and modifies it in order to dissociate it from the operator. The removal of the combination of repressor and inducer helps lac to be transcribed and expressed.

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What is the role of a solvent? It dissolves the solute in a mixture. It gets dissolved in a mixture It helps mix solids together. h It keeps the parts of a mixture separated!

Answers

Answer:

In chemistry, solvent effects are the influence of a solvent on chemical reactivity or molecular associations. Solvents can have an effect on solubility, stability and reaction rates and choosing the appropriate solvent allows for thermodynamic and kinetic control over a chemical reaction.

Explanation:

7. Some plants make cones. Other plants make flowers. What is the purpose of flowers and cones?A. They move water and food throughout the plant.
B. They hold the plant and soil so that it does not blow over in heavy winds.
C. They make seeds so that the plant can reproduce.
D. They take in water and nutrients from the soil.

Answers

Answer:

I believe the answer is C.

Explanation:

Coniferous plants (= cone bearing) carry seeds in their cones. This leads me to believe the answer is C because cones do not move water, nutrients, or hold soil.

A population is made up of individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype. What is the allele frequency of A1? Answer to 2 decimal places.

Answers

In population individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype, so the allele frequency of A1 is 0.49.

What is the allele frequency?

The incidence of a gene variant within a population is represented by the allele frequency. Alleles are different versions of a gene that share the same genetic locus on a chromosome.

To determine the allele frequency of A1

There is the formula:

frequency of A1 = (2 x number of A1A1) + Number of A1A2/ 2 x population

so, A1A1 = 149

A1A2 = 18

Population = 149 + 18 + 154 = 321

The frequency of A1 = (2 x 149) + 18/ 2 x 321

hence the frequency of A1 = 0.49

Therefore, the allele frequency of A1 is 0.49.

Learn more about alleles, here:

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Answer:

A or b

Explanation:

Answer the questions.1. Can a bird have a nest?
2. Can a bird have a house?
3. Can a bird have a truck?

Answers

1. Yes, a bird can have a nest. Birds often build nests to lay their eggs and raise their young.

2. No, a bird cannot have a house in the sense that humans do. Birds typically create nests or use natural shelter, like tree cavities, for their homes.

3. No, a bird cannot have a truck. Birds do not possess the physical or cognitive ability to own or operate vehicles like trucks.

In the practice of ________, scabs from smallpox victims were used to immunize susceptible individuals against smallpox.

Answers

Answer: Variolation

Explanation:

Variolation can be defined as the condition in which the inocolutaion of the individuals with the infectious materials, scabs or pulses from the smallpox victim.

This was introduced by the route of nasal passage or injected intravenously. The infection that developed because of this was less than normal and it provided protein against more serious disease.

Hence, the correct answer is Variolation.

How are a carrot, an amoeba, and a mandrill. alike

Answers

A carrot, an amoeba (a cell/organism that has the ability to change shape), and a mandrill (a primate) are all alike in that they are all eukaryotes. This means that their cells share the same features of having a nucleus and other organelles within an enclosed membrane.

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Which of the following will not prevent many bacterial infections