Which of the following is NOT a function of pili?
a. cell adhesion
b. defense by poking holes in other cells
c. exchange of genetic material
d. twitching motility
Answer: B
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All of the following statements concerning
Archaea are correct with one exception. Select the exception.
a. all are single-celled b. all have DNA c. none have a nucleus d. they are most closely related to bacteria e. some are producers
Which of the following is true concerning transport
proteins in the neuron membrane? a. Only sodium is actively transported. b. Only potassium is actively transported. c. Passive transporters with open channels prevent ions from leaking across the membrane. d. Active transporters move ions against their concentration gradients. e. It takes energy to move ions through passive transporters.
Which are the three main roles played by organisms in community life?
a. producer, detritivore, decomposer b. consumer, detritivore. decomposer c. producer, consumer, decomposer d. facilitator, decomposer, consumer e. realized niche, fundamental niche, habitat
The nuclear envelope is continuous with the
a. mitochondrial outer membrane. b. rough endoplasmic reticulum. c. Golgi apparatus. d. plasma membrane.