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sattari [20]
3 years ago
11

While most bacteria are eliminated by antibiotics, some can possess mutations that are resistant to antibiotics, leading to more

drug-resistant strains of bacteria. Such a mutation is an example of which of Charles Darwin's proposed criteria for traits to evolve through natural selection?
The trait must make the individual more fit to survive. T/F
Biology
1 answer:
Papessa [141]3 years ago
3 0

Answer:

The trait must make the individual more fit to survive. True

Explanation:

Darwin proposed that genetic variations are present in natural populations. Some genetic traits become beneficial under the changed environmental conditions. The organisms with these genetic traits are able to survive and reproduce better than the organisms that lack them. This results in an increased proportion of the beneficial genetic traits in the population over generations as the individuals having those traits reproduce more.

The presence of antibiotic resistance is a beneficial genetic trait that allows bacteria to survive in the presence of antibiotics. Natural selection favors the bacterial having antibiotic resistance and increases their proportions in the population over generations.

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What kind of bonds hold the phosphate groups together in ATP and ADP? Exxplain please
tigry1 [53]

Answer:

These phosphate groups are linked to one another by two high-energy bonds called <u>phosphoanhydride bonds</u>.

Explanation:

When one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and ATP is converted to adenosine diphosphate (ADP).

7 0
3 years ago
3. Which organs are responsible for<br> protecting the body? How?
Jlenok [28]

Answer:

Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes. Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body (for instance in the bowel)

Explanation:

hope this helps

5 0
2 years ago
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What is the effect on transcription of the structural and regulatory genes of the lac operon when lactose is present in the envi
vova2212 [387]

In the lac operon, glucose also plays an important role along with lactose. When Lactose is present in the environment along with glucose then it cannot deactivate the regulator gene [repressor], as a result, the repressor will bind to the operator and the transcription will be blocked.

When Lactose is present in the environment without glucose then the Catabolite repressor protein will bind to the CAP Site, and lactose will bind to the repressor [regulatory gene product], as a result, the repressor gets deactivated and the transcription takes place.

Lac operon: It is a set of three structural genes z, y, and a which are all transcribed and regulated under one single promoter. The three genes code for β-galactosidase, lactose permease, and transacetylase respectively.

β-galactosidase is responsible for breaking the lactose into glucose and galactose, lactose permease is responsible for transporting lactose across the cell membrane and transacetylase attaches a particular chemical group to target molecules.

Learn more about Lac operon here

brainly.com/question/1217140

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7 0
2 years ago
Why do you think it is so difficult to control the spread of invasive species?
Fynjy0 [20]
Invasive species are not native to the new ecosystem that they are invading therefore they have the upper hand. These species have different adaptations that help them spread faster than the other stable organisms in the environment. Once the invasive species starts to spread its almost impossible to stop due to its quick growing and competitive nature
5 0
3 years ago
Are lipids that serve as chemical messengers.
egoroff_w [7]

Answer:

C. Steroids

Explanation:

Some lipids such as steroid hormones serve as chemical messengers between cells, tissues, and organs, and others communicate signals between biochemical systems within a single cell.

6 0
3 years ago
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