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TLS Online TPP Program

#Question id: 11644

Seven days after ovulation, pituitary secretion of luteinizing hormone (LH) decreases rapidly. What is the cause of this decrease in secretion?

#7. System Physiology – Animal
  1. The anterior pituitary gland becomes unresponsive to the stimulatory effect of gonadotropin releasing hormone (GnRH)
  2. Estrogen from the developing follicles exerts a feedback inhibition on the hypothalamus
  3. The rise in body temperature inhibits hypothalamic release of GnRH
  4. Secretion of estrogen and progesterone by the corpus luteum suppresses hypothalamic secretion of GnRH and pituitary secretion of LH
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TLS Online TPP Program

#Question id: 4308

#3. Fundamental Processes

Most repressor proteins are allosteric. Which of the following molecules binds with the repressor to alter its conformation and therefore affect its function?
TLS Online TPP Program

#Question id: 1098

#4. Cell Communication and Cell Signaling

Which of the following is the most plausible explanation for why an animal cell would be unable to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid?
TLS Online TPP Program

#Question id: 11563

#7. System Physiology – Animal

Hormones secreted by the posterior pituitary gland are made in the ________.
TLS Online TPP Program

#Question id: 23330

#Aptitude

The meaning of variable is
TLS Online TPP Program

#Question id: 10399

#6. System Physiology – Plant

Which type of the response shown by mutant phyA?