TLS Online TPP Program

#Question id: 11703


A female athlete who took testosterone-like steroids for several months stopped having normal menstrual cycles. What is the best explanation for this observation?

#Unit 7. System Physiology – Animal
  1. Testosterone stimulates inhibin production from the corpus luteum
  2. Testosterone binds to receptors in the endometrium, resulting in the endometrium’s failure to develop during the normal cycle
  3. Testosterone binds to receptors in the anterior pituitary that stimulate the secretion of follicle stimulating hormone (FSH) and luteinizing hormone (LH)
  4. Testosterone inhibits the hypothalamic secretion of gonadotropin-releasing hormone and the pituitary secretion of LH and FSH
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TLS Online TPP Program

#Question id: 616

#Unit 1. Molecules and their Interaction Relevant to Biology

Which equilibrium below applies to noncompetitive inhibition?

TLS Online TPP Program

#Question id: 617

#Unit 1. Molecules and their Interaction Relevant to Biology

Compare the two reaction coordinate diagrams below and select the answer that correctly describes their relationship.  In each case, the single intermediate is the ES complex.

TLS Online TPP Program

#Question id: 618

#Unit 1. Molecules and their Interaction Relevant to Biology

 In the following diagram of the first step in the reaction catalyzed by the protease chymotrypsin, the process of general base catalysis is illustrated by the number ________, and the process of covalent catalysis is illustrated by the number _________.

TLS Online TPP Program

#Question id: 619

#Unit 1. Molecules and their Interaction Relevant to Biology

The benefit of measuring the initial rate of a reaction V0 is that at the beginning of a reaction:

TLS Online TPP Program

#Question id: 620

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about a plot of V0 vs. [S] for an enzyme that follows Michaelis-Menten kinetics is false?

TLS Online TPP Program

#Question id: 621

#Unit 1. Molecules and their Interaction Relevant to Biology

Michaelis and Menten assumed that the overall reaction for an enzyme-catalyzed reaction could be written as Using this reaction, the rate of breakdown of the enzyme-substrate complex can be described by the expression: