All categories

3 years ago

In the structure of DNA, which nucleotides always pair with adenine

Biology

2 answers:

trasher [3.6K]3 years ago

7 0

Thymine always pairs with adenine.

Aleks [24]3 years ago

5 0

Answer:

Thymine always pairs with adenine.

Explanation:

In DNA there are four types of nucleotides that differ by the nitrogen base they have: adenine (A), guanine (G), cytosine (C) and thymine (T). These molecules are placed one behind the other and form a very long chain. DNA molecule is formed by two long polynucleotide chains, the two chains are complementary but not identical, that is, the adenine nucleotides of one chain pair with the thymine nucleotides of the other chain, that is, the adenine bases found in a strand interact with the thymine bases of the opposite strand, thus forming the double helix of the DNA.

You might be interested in

Name 3 things that scientists use to give new organisms names

Leto [7]

Body part, behavioral adaptations, or by whole body descriptions

4 0

4 years ago

What type of reaction do cells use to combine smaller monomers into larger functional polymers?

mr_godi [17]

The reaction that links monomers to make polymers is polymerization. This process is also referred to as dehydration synthesis. Two monomers are binding to each other and form one polymer. Example: hydrogen (H) from one monomer binds with a hydroxyl group (OH) from the other monomer and forms the polymer : H+ + OH- = H2O - the water molecule.

8 0

3 years ago

Write a paragraph or two to explain why there is little change in the pH of battery acid when it is diluted with water

3241004551 [841]

Battery acid is acidic in nature so its pH will be more.if we add a base its acidity level decreases and it becomes a poor acid. here water acts as a base to decrease the pH value and acidic nature of a acid substance that is battery acid.

8 0

4 years ago

there are 3 different ways for plates to interact with eachother list the 3 types of faults and what they do

Murljashka [212]

1) divergent boundaries - where plates move away from each other.
2)convergent boundaries - where plates move toward each other and collide.
3)transform boundaries - when two plates grin past each other.

7 0

4 years ago

The dominant allele H reduces the number of body bristles in fruit flies, giving rise to a hairless phenotype. In the homozygous

DerKrebs [107]

Answer:

a. 3:1 (normal bristles to hairless)

b. 2:1 (normal bristles to hairless)

Explanation:

a. If H allele is present, the fly will be hairless. But H allele is lethal at homozygous condition, so all hairless flies will be heterozygous for H locus (Hh). S allele has no effect on bristle number, but in presence of H allele, S produces a "normal" phenotype and is also lethal at the homozygous condition. So genotypes and phenotypes will be like this:

- SSHH: No viable- Lethal

- SSHh: No viable-Lethal

- SShh: No viable-Lehtal

- SsHH: No viable-Lethal

- SsHh: Normal

- Sshh: Hairless

- ssHH: Normal

- ssHh: Normal

- sshh: Normal

A cross between two normal flies carrying the two alleles (SsHh) will produce (according to the attached Punnett Square):

6 Normal (SsHh, ssHh, and sshh)

2 Hairless (Sshh)

Therefore, the ratio of flies with normal bristles to hairless individuals will be 3:1.

b. When the hairless progeny of the previous cross (Sshh) are crossed with one of the parental normal flies from part a (SsHh), it will be produced (according to the second Punnett Square):

8 Normal (SsHh, ssHh, and sshh)

4 Hairless (Sshh)

So, the ratio of flies with normal bristles to hairless individuals will be 2:1.

7 0

3 years ago