In one butterfly species, the colors of individuals range from white to black, with many shades of gray in between
If the butterflies in a mountain population become more and more similar in color over several generations (e.g., if most butterflies are the same shade of gray), what kind of evolutionary force is likely acting on the population?
A) Artificial selection B) Stabilizing selection
C) Directional selection D) Disruptive selection
B
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An antibiotic is added to a culture of E. coli, resulting in death of the cells. Bacteriophage are then added. Would the phage replicate in the E. coli cells? Why or why not?
A. Yes, because the machinery inside the cells is most likely still active, even though the cells are no longer living. The virus could use that machinery to replicate new virus particles. B. No, because the virus would depend too much on having the active machinery of a living cell for its replication. Without the ability of the cell to try to replace what is lost/damaged/used as the virus goes through its life cycle, the virus couldn't reproduce effectively. C. Yes, because viruses are capable of reanimating dead cells to force them to produce more virus particles. D. No, because entry of the virus into the target cell is dependent on the cell being alive to conduct endocytosis of the virus.
Parasites represent an unusual type of predation in that the parasite typically ________
a. does not kill its host (prey) outright b. completes its life cycle within the host c. is significantly smaller than the organism it preys upon d. all of the choices
Which of the following statements concerning the spinal cord is false?
a. It shows some plasticity and ability for training. b. It serves as a nerve corridor from the body to the brain. c. It is responsible for some reflexive actions. d. It is composed of cell bodies, dendrites, and axons but not glial cells. e. It contains both sensory and motor nerve
Which hormones counteract each other in regulating calcium homeostasis?
A. atrial natriuretic peptide and aldosterone B. antidiuretic hormone and parathyroid hormone C. antidiuretic hormone and aldosterone D. antidiuretic hormone and vitamin D (1,25 dihydroxyvitamin D) E. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D)