Question

Complete the sentences. Each term may be used more than once.

a. In a circular bacterial chromosome, the structure of DNA is a____________ double helix.
b. If DNA is twisted in the_________ direction, it becomes overwound.
c. Overwinding results in____________supercoiling.
d. If DNA is twisted in the_________ direction, it becomes underwound.
e. Underwinding results in____________ supercoiling.
f. One effect of_________ supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix.

Answer 1

Answer:

The correct answer is -

1. right-handed

2. right-handed

3. positive

4. left-handed

5. negative

6. negative

Explanation:

In a circular bacterial chromosome, the structure of DNA is a right-handed double helix In a circular bacterial chromosome.

If DNA is twisted in the right-handed direction, it becomes overwound. Overwinding results in positive supercoiling takes place. If DNA is twisted in the left handd direction, it becomes underwound. Underwinding results in negative supercoiling.

f. One effect  negative supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix