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TLS Online TPP Program

#Question id: 10349

Elevated plastid levels of glutamine stimulate the activity of glutamate synthase (also known as glutamine:2- oxoglutarate aminotransferase, or GOGAT). Given below some of the statements about GOGAT, which one of the following is incorrect?

#Unit 6. System Physiology – Plant
  1. Plants contain two types of GOGAT; one accepts electrons from NADH, and the other accepts electrons from ferredoxin (Fd)
  2. The NADH type of the enzyme (NADH-GOGAT) is located in plastids of nonphotosynthetic tissues such as roots or the vascular bundles of developing leaves
  3. The ferredoxin-dependent type of glutamate synthase (Fd-GOGAT) is found in chloroplasts and serves in photorespiratory nitrogen metabolism
  4. This enzyme transfers the amide group of glutamate to 2-oxoglutarate, yielding two molecules of glutamine
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TLS Online TPP Program

#Question id: 10984

#Unit 7. System Physiology – Animal

Which of the following are caused by acetylcholine?
TLS Online TPP Program

#Question id: 10985

#Unit 7. System Physiology – Animal

What is the membrane potential (threshold level) at which the S-A node discharges?
TLS Online TPP Program

#Question id: 10986

#Unit 7. System Physiology – Animal

Which of the following conditions at the A-V node will cause a decrease in heart rate?
TLS Online TPP Program

#Question id: 10987

#Unit 7. System Physiology – Animal

If the ventricular Purkinje fibers become the pacemaker of the heart, what is the expected heart rate?
TLS Online TPP Program

#Question id: 10988

#Unit 7. System Physiology – Animal

What is the normal total delay of the cardiac impulse in the A-V node and the A-V bundle system?
TLS Online TPP Program

#Question id: 10989

#Unit 7. System Physiology – Animal

What is the resting membrane potential of the sinus nodal fibers?