The bacterium (Agrobacterium/Cyanobacteria/Rhizobium) is a member of the alphaproteobacteria that forms beneficial relationships with higher plants.
Fill in the blank(s) with the appropriate word(s).
Rhizobium
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Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg. B. two sperm cells fertilize the two polar nuclei. C. one sperm fuses with the egg and the other sperm fuses with both polar nuclei. D. the polar nuclei fuse with the egg after it has fused with the sperm.
In the process of lateral inhibition, ____ inhibit distant bipolar cells
a. ganglion cells b. amacrine cells
c. cones d. rods e. horizontal cells
Scientists are always thinking about ways to
improve experimental design. In the text's potato chip experiment, which of these might do so? a. show a different movie b. exclude teenagers as group members c. collect uneaten chip remains and weigh them for both groups d. provide free drinks e. use a smaller theater
Penicillin works most effectively against gram-positive bacteria because:a
penicillin affects cell membranes. b. they have a thick peptidoglycan cell wall, and penicillin affects the synthesis of peptidoglycans. c. they have special protein channels that allow penicillin to enter the cell and halt the cell cycle. d. they are smaller than gram-negative bacteria and, thus, easily take up penicillin by diffusion. e. they contain prophages that negatively interact with penicillin.