If the peptidoglycan layer is between two plasma membranes in an organism, that organism is ____
a. Gram-negative
b. an archaean
c. Gram-positive
d. chemoautotrophic
e. eukaryotic
ANSWER: a
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Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should _____.
A) test whether other traits in these males are also adaptive B) look for evidence of hair in ancestors of tamarins C) determine if hair length is heritable D) test whether males with shaved heads are still able to mate
The correct epidemiological term for the number of persons who have died as the result of a particular disease is the _______rate
Fill in the blank(s) with the appropriate word(s).
Zooplankton-eating fish are ________.
a. primary consumers b. detritivores c. producers d. herbivores e. secondary consumers
Insects such as mosquitoes and beetles can beat their wings at tremendous speeds. This can be accomplished because
A. their wing muscle contractions causes another set of muscles to stretch, which in turn produces another contraction without waiting for the arrival of a nerve impulse. B. their wing muscle contractions are capable of producing more ATP which allows these insects to have much faster and sustained wing movements. C. their wing muscle contractions cause another set of muscles to relax, which in turn produces another wing movement. D. their wing muscle contractions are stimulated by the continuous nerve signal impulses, which produce a continuous contraction of their wing muscles. E. their wing muscle contractions produce nerve impulses, which lead to more contraction of the wing muscles which in turn permits faster motion of the wings.