Compare and contrast the mechanism of action of a steroid and a protein-type hormone at the cellular level. What will be an ideal response?
Steroid hormones are lipid soluble and therefore cross the plasma and nuclear membranes to
combine with nuclear receptors. This interaction results in the synthesis of new proteins.
Protein hormones combine with plasma membrane cell receptors and initiate a cascade of
protein activation that will produce an alteration of cell activity.
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Approximately how many genes comprise the human exome?
A) 20 million B) 200,000 C) 2,000 D) 20,000
Which fossil would be the oldest in a given strata and why? What will be an ideal response?
In humans, how does spermatogenesis differ from oogenesis?
a. Spermatogenesis involves meiosis, while oogenesis involves mitosis. b. Spermatogenesis produces fewer numbers of gametes. c. Spermatogenesis begins at birth, while oogenesis begins at puberty. d. Spermatogenesis continues throughout life, while oogenesis ends at menopause.
Which of the following are mechanisms to prevent polyspermy? (Check all that apply.)A) Altering the composition of the exterior egg coatB) Change in the membrane potential of the eggC) Cortical granule enzymes remove sperm receptors from egg.D) Special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one.E) Toxic molecules exit the egg to attack the extra sperm.F) Vitelline envelopes lift off the surface of egg.
What will be an ideal response?