Cells of the outer surface of a sponge obtain nutrients by ____
a. absorbing food that diffuses from the central cavity
b. capturing food in their microvilli
c. absorbing food distributed by amoeboid cells
d. phagocytosing bacteria and other small food items
e. poisoning small fish that contact them
ANSWER: c
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A. metabolic B. col C. virulence D. resistance
The two basic structural forms taken by most viruses are ____
a. polyhedral or enveloped b. helical or enveloped c. helical or polyhedral d. cylindrical or polyhedral e. cylindrical or enveloped
Identifying an autosomal recessive mutation in a mutagenic screen in Drosophila requires identification of a mutant in the F3 generation. If testing for a sex-linked recessive lethal mutation (e.g
, cn l + using a balancer chromosome such as cnCyO), in which generation can lines with mutations be identified?
Which location might exhibit the greatest variation in temperatures throughout the seasons?
A) a small town at sea level in Panama B) San Diego, California C) a city in Finland D) Rome, Italy