Practice Questions

TLS Online TPP Program

#Question id: 11549

If a biochemist discovers a new molecule, which of the following pieces of data would allow her to draw the conclusion that the molecule is a steroid hormone?

I) The molecule is lipid soluble.

II) The molecule is derived from a series of steps beginning with cholesterol.

III) The molecule acts at a target tissue some distance from where it is produced.

IV) The molecule uses a transport protein when in an aqueous solution such as blood.

#Unit 7. System Physiology – Animal

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#Question id: 2271

#Unit 1. Molecules and their Interaction Relevant to Biology

Depolymerization of microtubules is inhibited by

#Question id: 2290

#Unit 1. Molecules and their Interaction Relevant to Biology

The cytoskeleton includes all of the following except

#Question id: 2585

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?

A. Tropomyosin shifts and unblocks the cross-bridge binding sites.

B. Calcium is released and binds to the troponin complex.

C. Transverse tubules depolarize the sarcoplasmic reticulum.

D. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP.

E. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane.

#Question id: 32509

#Unit 1. Molecules and their Interaction Relevant to Biology

#Question id: 32510

#Unit 1. Molecules and their Interaction Relevant to Biology

#Question id: 32511

#Unit 1. Molecules and their Interaction Relevant to Biology