Icosahedral viruses are constructed from ring- or knob-shaped units called ________.
Fill in the blank(s) with the appropriate word(s).
capsomers
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The genomes of closely related species are more similar than distantly related species because _____
a. the less time since the species diverged, the more lethal DNA mutations will accumulate b. the more time since the species diverged, the more neutral DNA mutations will accumulate c. the less time since the species diverged, the more neutral DNA mutations will accumulate d. the more time since the species converged, the fewer adaptive DNA mutations will accumulate e. all organisms will accumulate lethal DNA mutations at the same rate
Which of the following does NOT characterize
most prokaryotes? a. no nucleus b. a single circular chromosome c. cell wall d. complex internal membranes e. great metabolic diversity
The Krebs cycle takes place in the
a. ribosomes. b. cytoplasm. c. nucleus. d. mitochondria. e. chloroplasts.
T cells multiply and become specialized in the
a. bone marrow. b. spleen. c. thymus. d. thyroid. e. tonsils.