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Elza [17]
3 years ago
13

A zebra cell is just about to replicate its DNA. Which of the following will happen first?

Biology
2 answers:
Ratling [72]3 years ago
8 0

Answer:

The DNA unravels to make two strands

Explanation:

A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits (A, G, C and T). Each of these chains is known as a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together.

Before a cell divides, its DNA needs to be replicated or duplicated in order to ensure that each new cell receives the correct number of chromosomes. This process of DNA replication occurs in the S-phase of interphase stage during cell cycle.

Before this DNA replication can occur, the length of the DNA double helix about to be copied must be unwound into two single strands. The two strands become separated by breaking the weak hydrogen bonds that link the paired complementary bases (A-T, G-C). This process of unzipping the double-helical structure into a Y-shape known as replication fork is carried out by DNA HELICASE. The Y-shaped replication fork will be the template for replication to begin.

Ray Of Light [21]3 years ago
5 0
First, the two strands of DNA unwound, just like a zipper.
D is the right one.
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This chyme is passed to the small intestine where several enzymes from the liver and pancreas digest the food in smaller particles and absorb these particles in the blood. Therefore absorption takes place in the small intestine.

Then the solid waste material left behind after absorption is transported from small intestine to the large intestine and from large intestine waste is eliminated out of the body.

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