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2 years ago

DNA, the genetic material of living organisms, is damaged by light in the

Biology

1 answer:

insens350 [35]2 years ago

6 0

Answer:

The correct option is <em>B) ultraviolet region, especially below a wavelength of 320 nm.</em>

Explanation:

Ultraviolet light carries an enormous amount of energy in it. It is invisible to the human eye. When UV light with enormous energy and wavelength lesser than 320nm, hits the DNA, it causes changes in the structure of the DNA. Mostly, it affects the thymine nitrogenous base regions and forms pyrimidine dimers. The structure of the DNA changes on all the sites where dimers form and hence, they cannot be properly transcribed.

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How do bone markings on modern human skeletons relate to bone markings found on the fossils of common ancestors?

STALIN [3.7K]

Answer:

Explanation:

As with the other markings, their size and shape reflect the size of the vessels and nerves that penetrate the bone at these points. ... The surface features of bones depend on their function, location, attachment of ligaments and tendons, or the penetration of blood vessels and ner

3 0

2 years ago

6. A scientist measures the circumference of acorns in a population of oak trees

melisa1 [442]

Answer:

6. 2 cm

8. Greater than 2 cm and less than 2 cm

Explanation:

Complete Question

6. A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. What would you expect the most common circumference(s) to be after 10 generations of stabilizing selection?

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

8. Refer to question 6, but this time answer what you would expect after 10

generations of directional selection.

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

Solution -

6. In an stabilizing selection, the average trait of a given population is favored over extreme values. Hence, it can be said that one specific trait is over presented in a given population. For example – uniform human birth weight, number of eggs a bird lay etc.

Here in this case if most common circumference is 2 cm , then the tree population will try to have this trait as a stabilizing trait.

Thus, option A is correct

8. In a directional selection, the genetic variation decreases as per the environmental change. And hence the average trait will not be selected. Instead traits either higher or lower the average values will be preferred.

Thus, option C is correct

3 0

2 years ago

What chemicals regulate the cell cycle how do they work?

Molodets [167]

Cyclins are the chemicals that regulate the cell cycle. Cyclins work by regulating the timing of the cell cycle in eukaryotic cell. Cyclins activates cyclin dependent kinases (CDKs) (an enzyme that works by adding <span>negatively charged phosphate groups to other molecules in a process called phosphorylation) by binding to it to form a cyclin-Cdk complex. This complex then functions by acting as a signal to the cell to move to the next cell cycle phase. At the end of the event, the cyclin is degraded, Cdk is deactivated, therefore signaling exit from a specific phase.</span>

5 0

2 years ago

Read 2 more answers

Based on your research what are 3 reasons plants are propagated asexually?

liubo4ka [24]

The 3 reasons plants and propagated asexually are:

1. To preserve the genetic characteristics of a particular plant

2. Propagate plants it do not produce viable seeds for example: (bananas, pineapple, seedless grape etc.)

3. Produce seed that is difficult to germinate or it has a very short.

7 0

2 years ago

Read 2 more answers

"Meghan was driving home when she heard a tire explode on the car right next to her. As a result, her heart started pounding and

Aliun [14]

Answer:

Sympathetic nervous system

Explanation:

The sympathetic nervous system of the autonomic division prepares the body for stress or emergency conditions by generating the “fight-or-flight” responses. The sympathetic nervous system triggers the release of stress hormones from the adrenal medulla to generate the set of physiological responses.

There is dilation of the pupil, and an increased rate of heartbeat and increased blood pressure. Other responses include dilation of airways and dilation of blood vessels that supply blood to skeletal muscles, heart muscles, liver, etc. Under the given emergency condition, the sympathetic nervous system of Meghan was activated to generate the fight or flight response.

8 0

2 years ago