Some, but not all, virus capsids are surrounded by
A. either DNA or RNA.
B. a protein spore coat.
C. both DNA and RNA.
D. a protein capsid.
E. a membranous envelope.
Answer: E
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Although lacking a TCA cycle and a respiratory chain, ________ can divide with a generation time of eight to ten minutes when growing in a human host.
A. Staphylococcus aureus B. Streptococcus pyogenes C. Clostridium perfringens D. Helicobacter pylori
The photoreceptors of an earthworm are
located
a. on short antennae. b. on their body surface. c. in their eyes. d. near the tip of their tail. e. nowhere- earthworms do not have photoreceptors.
Cnidarians all share the ability to
A. fly. B. live on land. C. sting predators and prey. D. photosynthesize. E. secrete enzymes to digest food.
In knockout experiments,
a. genes are removed from chromosomes. b. normal genes are replaced physically by mutated genes. c. wild type genes are mutated to prevent their transcription or translation. d. mRNAs are prevented from attaching to ribosomes. e. the protein products of specific genes are inactivated.