What happens to most of the nitrogen in a leaf every autumn?
A) It is resorbed by the tree.
B) It is released as N2 gas.
C) It is broken down in soil.
D) It is consumed by decomposers.
A
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The earliest photosynthesizers likely used ____ as electron donors
a. chloride gas b. hydrogen peroxide c. hydrogen sulfide d. magnesium sulfide e. ammonia
The function of a helix-turn-helix motif in a transcription factor is to
A) recruit RNA polymerase. B) form dimers with other transcription factors. C) bind a specific sequence in the major groove of DNA. D) unwind the double helix.
Holdfasts, gas-filled floats, and a thick, leathery
surface are found in species of a. red algae. b. brown algae. c. bryophytes. d. green algae. e. euglenoids.
Which of the following microbes has been genetically engineered to contain a protein that helps protect crops from freezing?
A) Deinococcus radiodurans B) Bacillus thuringiensis C) Pseudomonas D) Salmonella E) Escherichia coli