How does cell volume affect nutrient exchange between the cell and its external environment?
a. Very large cells are the best adapted for nutrient exchange.
b. Very small cells are the best adapted for nutrient exchange.
c. Nutrient exchange is not impacted by cell volume.
d. The ratio of cell volume to surface area determines the efficiency of nutrient exchange.
e. Cells with a large volume and small surface area are well-adapted for nutrient exchange.
ANSWER: d
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The transmission of Vibrio spp. to humans is by:
a. exposure of disrupted skin and mucosal surfaces to contaminated animal hides. b. ingestion of contaminated seafood or wa-ter. c. inhalation of contaminated air. d. close contact with carriers of the organism.
Answer the following statements true (T) or false (F)
1. Genetic drift is when an individual from one population is introduced into a new population, introducing new alleles. 2. The presence of the traces of pelvic bones in both whales and snakes indicate that they descended from an ancestor that once had legs. 3. The theory of evolution can accurately explain the origin of life on Earth. 4. Organisms can have forms that look similar but come from very different evolutionary ancestors. 5. The fact that mitochondria cannot live outside of the cell suggests that ancestral cells engulfed and kept alive free-living prokaryotic anaerobes.
A protein that becomes marked in a sequence called the destruction box and is degraded by proteasomes is
a. tubulin. b. cyclin. c. Ras. d. cAMP-dependent protein kinase.