AP (Advanced Placement) Biology: Questions 656 - 659 of 868

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Question number: 656

» Specialized Cell and Tissues

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MCQ▾

Question

The action potential in a neuron is maintained by the vigorous activity of

Choices

Choice (5)Response

a.

Sodium-potassium pumps

b.

Nodes of Ranvier

c.

Calcium pumps

d.

Sodium-chlorine pumps

e.

Slow acting sodium pumps

Question number: 657

» Nervous & Endocrine Systems

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MCQ▾

Question

The master switch board gland of the endocrine system is

Choices

Choice (5)Response

a.

The adrenal gland

b.

The pineal gland

c.

The anterior pituitary

d.

The hypothalamus

e.

The posterior pituitary

Question number: 658

» Reproductive System & Development

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MCQ▾

Question

When fingers formed during foetal life, they represent a condition known as Syndactyly. What is the reason that it is no longer present at birth?

Choices

Choice (5)Response

a.

It is the function of amniotic fluid to destroy all the cells between fingers.

b.

Maternal antibodies cross the placenta and attack the cells between fingers and remove these temporary cells.

c.

There are no blood vessels in the fused fingers, so the cells between them die off.

d.

The cells between these fingers undergo a programmed apoptosis.

e.

Movement of fingers leads to degeneration of cells present in toes is the only reason.

Question number: 659

» Genetics

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MCQ▾

Question

If all males in a family are affected with hemophilia, but females rarely hemophilic, then the inheritance pattern may be

Choices

Choice (5)Response

a.

Dominant epistasis

b.

Incomplete dominance

c.

X-linked recessive

d.

Codominance

e.

Recessive epistasis

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