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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?

#Unit 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: 12989

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statement related to hydrogen bond and Van der Waals interactions
a. Hydrogen bond formation takes place between dipole-dipole interaction.
b. Van der waals interaction takes place between induced dipole-induced dipole.
c. Hydrogen bond formation takes place between induced dipole-induced dipole.
d. Van der waals interaction takes place between dipole-dipole interaction.
TLS Online TPP Program

#Question id: 341

#Unit 1. Molecules and their Interaction Relevant to Biology

 Which force can stabilize a DNA double-helix?
TLS Online TPP Program

#Question id: 339

#Unit 1. Molecules and their Interaction Relevant to Biology

The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:
TLS Online TPP Program

#Question id: 338

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the difference between covalent bonds and ionic bonds?
TLS Online TPP Program

#Question id: 337

#Unit 1. Molecules and their Interaction Relevant to Biology

Which statement below is true about the relative lifetime of a hydrogen bond, compared to the rate of water’s ionization to hydroxide ions and hydronium ions?
TLS Online TPP Program

#Question id: 336

#Unit 1. Molecules and their Interaction Relevant to Biology

Which would you expect to be most soluble in water?