A Y-shaped protein that proliferates in response to a specific antigen and recognizes these antigens is a(n)
A. interferon.
B. antibody.
C. complement.
D. phagocyte.
E. B cell.
B. antibody.
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Why is it believed that life cannot evolve on a planet that orbits a spectral type A, B, or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
The Calvin cycle
A. is a linear reactive pathway that produces ATP and NADPH to drive other cell processes. B. is a linear pathway that passes high-energy electrons to glucose molecules. C. is a cyclic reactive pathway that produces ATP and NADPH to drive other cell processes. D. is a linear reactive pathway that produces three-carbon molecules from CO2. E. is a cyclic reactive pathway that produces three-carbon molecules from CO2.
The ____ are the most diverse animal group
a. Vertebrates b. Insects c. Humans d. Protozoans e. Mollusks
Which of these combinations would be found in a nucleotide?
a. base-acid-salt b. adenine-thymine-uracil c. base-sugar-phosphate d. DNA-RNA-nucleus e. sugar-protein-fat