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lys-0071 [83]
3 years ago
14

What is a purine and a pyrimidine? Name them.

Biology
1 answer:
Kisachek [45]3 years ago
8 0

Answer:

Purines and Pyrimidines are nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA. The two-carbon nitrogen ring bases (adenine and guanine) are purines, while the one-carbon nitrogen ring bases (thymine and cytosine) are pyrimidines.

Explanation:

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Which structure is found in all eukaryotic cells <br>​
Marizza181 [45]

Answer:

unlike prokaryotic cells, eukaryotic cells have: a membrane-bound nucleus. numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria) several rod-shaped chromosomes.

Explanation:

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6 0
3 years ago
1. A dominant gene (A) causes yellow color in rats, the dominant allele on another independent gene (R) produces black coat colo
Novosadov [1.4K]

Answer:

Parents: Yellow (Aarr) and Grey (AaRr)

Explanation:

Given:

allele A = yellow

allele R = black,

Heteroozygous = gray

Genotypes of the parents:

yellow (Aarr) - female

gray (AaRr) - gray

cross between these

Parents: Yellow (Aarr)  and Grey (AaRr)

Gametes: (Ar, ar) and (AR, Ar, aR, ar)

F1 (Punnet square)

----|----- AR ------|------- Ar ------|------ aR -----|----- ar

Ar | AARr (gray) | AArr (yellow) | AaRr (gray) | Aarr (yellow)

ar | AaRr (gray) | Aarr (yellow) | aaRr (black) | aarr (cream)

Ratio: 3/8 yellow : 3/8 gray : 1/8 cream : 1/8 black

6 0
3 years ago
Which transplant method would prevent the rejection of tissue after an organ transplant?
balandron [24]

Answer:

The correct answer is (1) using organs cloned from the cells of the patient

Explanation:

Organ Cloning is a method to solve the failures/rejection in organ transplants. It consists of the creation of human embryonic stem cells in order to use them as raw material for different medical therapies. These can be used to produce a large number of different cells, including: tissues, muscles and organic cells. The main research in human organ cloning is aimed at achieving healthy tissues that can be transplanted in people without immunological rejection.

6 0
3 years ago
What are the negative effects of endangered species?
jonny [76]

Healthy ecosystems depend on plant and animal species as their foundations. When a species becomes endangered, it is a sign that the ecosystem is slowly falling apart. Each species that is lost triggers the loss of other species within its ecosystem. Humans depend on healthy ecosystems to purify our environment.
8 0
3 years ago
Read 2 more answers
What of the following happens first?
AfilCa [17]

Answer:

A

Explanation:

A because the introns are edited then linked together by nucleotides

6 0
3 years ago
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