Question

Why do ventricles need to squeeze from the bottom of the muscle to the top of the muscle?

A. To ensure that ALL of the blood makes it from the ventricles into the pulmonary artery and aorta

B. This is simply how the electrical fibers are aligned. It has no greater use.

C. To ensure that ALL of the blood makes it from the ventricles into the left and right atrium

What problem would arise if topoisomerase was removed from a cell?

A. The cell would be unable to keep strands of DNA separate

B. The cell would be unable to straighten out the DNA from a double helix to a ladder structure.

C. The cell would be unable to join DNA fragments together.

D. The cell would be unable to use RNAs

Answer 1

Answere :

Question 1 :  The correct option is "To ensure that ALL of the blood makes it from the ventricles into the pulmonary artery and aorta".

Explanation : Ventricles need to squeeze from the bottom of the muscle to the top of the muscle because it ensure that all of the blood makes it from the ventricles into the pulmonary artery and aorta.

The ventricles contract from the bottom upwards to ensure all the blood is squeezed from the ventricles. There can’t be any blood left in the ventricles otherwise the heart will not be performing at its maximum and the atria will not be able to empty all of their blood into the ventricles.
Ventricles have thicker walls than atria because they must pump blood further. The atria only push blood into the ventricles, whereas the ventricles have to pump the blood either to the lungs by pulmonary artery or throughout body by aorta.

Question 2 : The correct option is "The cell would be unable to straighten out the DNA from a double helix to p ladder structure.

Explanation : Topoisomerases is a category of enzymes that controls the coiling of DNA to protect DNA, or uncoiling to make DNA straight which available for replication.

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