Which of the following types of cells does HIV preferentially infect?
A) cytotoxic T cells
B) natural killer cells
C) helper T cells
D) memory cells
Answer: C
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What was a main factor in why Sir Alistair Hardy wanted to study the Antarctic seas? a. To study the evolution of whales for science
b. To study the biology of fish for harvesting. c. To study the biology of whales for efficient commercial exploitation. d. To study the distribution of whales for science.
Rhodopsin
a. is a pigment. b. is found in rods. c. absorbs photons of blue-to-green light. d. is concentrated at the edges of the retina. e. includes all of these descriptions
Jacob had just finished his lab work and went to the sink to wash his hands. He removed his watch, and added liquid soap to his hands. He then turned on the water and began to rub his hands together, lathering for 20 seconds and cleaning fronts and backs of hands, fingernails, and between his fingers. He then rinsed his hands in running water, dried his hands with paper towels, and used an additional paper towel to turn off the faucet. Which statement is correct?
Jacob wasted paper towels by using one to turn off the faucet. Jacob did everything correctly. Jacob should have washed his hands for at least a minute. Jacob should have wet his hands in running water before applying the soap.
A plant that lacks true roots, stems, and leaves will be a(n) _______.
a) gymnosperm b) angiosperm c) nonvascular plant d) seedless vascular plant