If you wanted to decrease sperm production, which of the following hormones would be most effective?
A) inhibin
B) FSH
C) GnRH
D) TSH
A
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Why do many animals do most of their calling at dawn and dusk?
A. Most predators are not active at those time. B. Air is less turbulent and carries sound better. C. Pheromones are also released at dawn and dusk. D. Animals preferentially mate at night. E. Such imprinting behaviors are better received at those time.
Chronic myeloid leukemia is caused by a translocation that creates:
A. A proto-oncogene B. A fusion protein that acts like a transcription factor C. A protein that increases growth factor production D. A fusion protein that has constitutive kinase activity E. A deletion of a whole chromosome
The biconcave shape of red blood cells is determined by membrane-anchored internal proteins called
A. phospholipids. B. spectrins. C. cytoskeleton. D. clathrins. E. actin filaments.
When dissecting a specimen, Barry noticed that the arteries were thicker and more elastic than the veins. Why?
A. Arteries have less smooth muscle than veins. B. Veins have valves. C. Veins return blood to the heart against gravity. D. Arteries are under greater pressure. E. Arteries contain a greater volume of blood.