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marusya05 [52]
4 years ago
9

20.

Biology
2 answers:
grin007 [14]4 years ago
7 0

Answer:

D. Sugars and phosphates

Explanation:

DNA or deoxyribonucleic acid which is a self-replicating material present in nearly all organisms and the constituent of chromosomes, It is also the carrier of the basic instructions of life!

We have a total of 23 chromosomes in our cells!

hope this helps

<h3>sincerely,</h3><h3>Ur cat friend kittylike11</h3>

xxMikexx [17]4 years ago
3 0

Answer:

Sugars and phosphates  

Explanation:

DNA is deoxyribonucleic acid.

The backbone is based on a repeated pattern of a sugar group (deoxyribose) and a phosphate group.  

The image below shows one straightened-out strand of DNA with a backbone of alternating sugars and phosphates.

A is wrong. There is no ribose in DNA.

B is wrong. The nucleic acids A, C, G, and T join one strand of DNA to the other.

C is wrong. There is no RNA in DNA.

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svetlana [45]

Answer:

There are milder winters in the west and colder winters in the east

4 0
3 years ago
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In a certain species of dog, a black nose is dominant over a pink nose. What would happen in a cross between a pure breed domina
lions [1.4K]

Answer:

phenotype: black nose

genotype: Bb

Explanation:

Pure breed dominant genotype (BB)

+

recessive pure breed genotype (bb)

=

heterozygous genotype (Bb)

because black is dominant, thats the trait that will show. the pink will be masked by the black nose color.

3 0
4 years ago
Which statement describes one way that roots and leaves interact to transport water through plants?
Aneli [31]

The statement that describes one way that roots and leaves interact to transport water through plants is: evaporation of water through the stomata of leaves creates a pull that draws water in through the roots.

<h3>What is transpiration?</h3>

Transpiration is the process whereby water is lost from the surface of the leaf into the atmosphere.

A process called transpiration pull facilitates the absorption of water by the root hairs of the plant.

The water then moves via the conducting vessel called xylem to other parts of the plant.

Therefore, the statement that describes one way that roots and leaves interact to transport water through plants is: evaporation of water through the stomata of leaves creates a pull that draws water in through the roots.

Learn more about transpiration at: brainly.com/question/13891305

4 0
2 years ago
In maize (corn), assume that the genes A and B are linked and 30 map units apart. If a plant of Ab/aB is selfed, what proportion
Marat540 [252]

Answer:

2.25%.

Explanation:

The recombination progeny occur due to the crossing over of the homologous chromosomes. The linked gene is 30 map units apart and the recombination frequency is 30.

If a plant of Ab/aB is selfed then the progeny obtained is as follows: Ab – parental – 35%, aB – parental – 35%, AB – recombinant – 15%  and ab – recombinant – 15%. The cross between the F2 progeny with aabb is ( 0.15 × 0.15) = 0.0225 or 2.25%.

Thus, the answer is option (A).

7 0
3 years ago
Mario is highly afraid of spiders. Which part of the brain would be activated if he were to enter a room that had a lot of spide
Dennis_Churaev [7]

Answer: Hypothalamus

Explanation:

Due to the fear of spiders, Mario is likely to have the following sensations: sweating, shivering, increased heartbeat, raised blood pressure.

And all these are controlled by the hypothalamus, a part of the Fore-brain

8 0
3 years ago
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