Practice Questions

TLS Online TPP Program

#Question id: 34168

Angiotensin II stimulates aldosterone production in the zona glomerulosa by binding to AT1 receptors. Which of the following best describes the intracellular signaling pathway and its role in aldosterone biosynthesis?

#Unit 7. System Physiology – Animal

AT1 activates cAMP via Gs protein, enhancing 11β-hydroxylase activity for cortisol synthesis
AT1 activates adenylyl cyclase, increasing cAMP and PKA, which upregulates LDL receptor expression
AT1 signals through Gq, activating phospholipase C, which increases PKC activity and promotes aldosterone synthase function
AT1 signals via Gi protein to inhibit cAMP and reduce cortisol feedback, indirectly promoting aldosterone release

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TLS Online TPP Program

#Question id: 33111

#Unit 1. Molecules and their Interaction Relevant to Biology

when [S]>>Km. That is, so the reaction is

TLS Online TPP Program

#Question id: 33112

#Unit 1. Molecules and their Interaction Relevant to Biology

when [S] <Km, then v<(Vmax/Km)[S]. That is, the rate, v, approximately follows which of the following graph

TLS Online TPP Program

#Question id: 33113

#Unit 1. Molecules and their Interaction Relevant to Biology

In enzyme catalyzed reaction which of the following represents dP/dt

TLS Online TPP Program

#Question id: 33114

#Unit 1. Molecules and their Interaction Relevant to Biology

When Enzyme active sites are not filled with substrate the S/Km ratio must be

TLS Online TPP Program

#Question id: 33115

#Unit 1. Molecules and their Interaction Relevant to Biology

k_cat/K_m is an

TLS Online TPP Program

#Question id: 33116

#Unit 1. Molecules and their Interaction Relevant to Biology

Represents