AP (Advanced Placement) Biology: Questions 571 - 574 of 868

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Question number: 571

» Specialized Cell and Tissues

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MCQ▾

Question

Thin filaments of the muscle cell are composed of all of the following EXCEPT

Choices

Choice (5)Response

a.

Troponin

b.

Actin

c.

Myosin

d.

Myosin binding sites

e.

Tropomyosin

Question number: 572

» Nervous & Endocrine Systems

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MCQ▾

Question

A hormone may produce changes in a cell by two different mechanisms. One of this is

Choices

Choice (5)Response

a.

Producing cAMP as a second messenger

b.

Increasing the concentration of GTP

c.

Binding to surface antibodies as an antigen

d.

Increasing the cytoplasmic activity

e.

By the release neurotransmitter

Question number: 573

» Specialized Cell and Tissues

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MCQ▾

Question

Nerve agents such as VX and sarin impair signal transduction by acting on neuromuscular synapse by

Choices

Choice (5)Response

a.

Binding to cholinesterase enzyme, which prevents the recycling of the neurotransmitter and prevents muscle contraction

b.

Chelating Ca2+ ions, which prevents muscle contraction

c.

Blocking the acetylcholine receptors on the muscle cells, which prevents muscle contraction

d.

Preventing the reuptake of degraded acetylcholine components by the neuron, which prevents muscle contraction

e.

Causing excess release of serotonin, which prevents muscle contraction

Question number: 574

» Specialized Cell and Tissues

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MCQ▾

Question

An action potential is propagated down a neuron by

Choices

Choice (5)Response

a.

Reflex activated ion channels

b.

Voltage-gated ion channels

c.

Mechanically gated ion channels

d.

Ligand-gated ion channels

e.

Ion regulated ion channels

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