The stroma of the land-plant chloroplast is evolutionarily derived from __________
A. the thylakoid membrane
B. the plasma membrane of cyanobacteria
C. the periplasm of cyanobacteria
D. the cytoplasm of cyanobacteria
E. the plasma membrane of a eukaryotic
ancestor
D
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This bacterium is unique in that it does not possess a flagellum but is motile by gliding motility
a. Acidovorax spp. b. Sphingobacterium spp. c. Spingomonas spp. d. Pseudomonas spp.
Which ecosystem has the lowest percentage of total net primary productivity?
a. open ocean b. savanna c. swamp and march d. temperate deciduous forests e. tundra
The most plentiful sugar in nature is
a. glucose. b. sucrose. c. fructose. d. maltose. e. lactose.
A mutant bacterial cell has a defective aminoacyl-tRNA synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine. The consequence of this for the cell will be that _____
A) none of the proteins in the cell will contain phenylalanine B) proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU C) the cell will compensate for the defect by attaching phenylalanine to tRNAs with lysine-specifying anticodons D) the ribosome will skip a codon every time a UUU is encountered