In the hypothetical biochemical pathway, P ? Q + R ? S ? T, which step is likely to have evolved first?
A. P ? Q
B. R ? S
C. Q + R
D. S ? T
Answer: D
You might also like to view...
Living as a member of a group may have all of the following advantages except what?
A. being more resistant to disease and parasites B. increased feeding rate C. greater protection from predators D. members learn about new food sources from other members E. more individuals scan the environment for dangers
Clams and other bivalves typically have:a
dermal gills. b. gills adapted for trapping food. c. an operculum. d. book lungs. e. swim bladders.
Which of the following cells is also known as the "antigen presenting cell?"
Post-exposure prophylaxis for rabies includes shots of HRIG (human rabies immune globulin) and rabies vaccine. The HRIG provides ________ whereas the vaccine promotes the development of ________.
A. natural passive immunity; artificial passive immunity B. artificial active immunity; natural active immunity C. artificial passive immunity; artificial active immunity D. artificial active immunity; artificial passive immunity E. artificial passive immunity; natural active immunity