Cavitation can occur when what happens?
A. Root pressure pushes water up the xylem.
B. Starch grains block the sieve tubes.
C. Gas bubbles expand inside a tracheid or vessel member.
D. Stomata get stuck closed.
E. Clouds block sunlight shining on the leaves.
C. Gas bubbles expand inside a tracheid or vessel member.
A gas bubble in the xylem can block the movement of water through the plant. This can cause dehydration and even death of the plant.
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The mutated gene that causes cystic fibrosis is ____
a. CFTR b. CRFT c. CTFR d. CRTF e. CFRT
One of the stop codes to signal ribosomes to stop adding amino acids to the protein chain is
a. UAG. b. GUA. c. AUG. d. TAG. e. ATG.
Net primary productivity represents:a
the rate at which energy is captured during photosynthesis. b. the amount of biomass in excess of that needed to support plant cell respiration. c. the amount of carbon dioxide produced by plants. d. plant reproduction per unit area per unit time. e. energy production in an area per unit time.
What enables the copied chromosomes to separate during binary fission?
a. The nuclear membrane dissolves. b. The mitotic spindle drives the separation. c. The septum splits the replicated chromosomes. d. The chromosomes are attached to different parts of cell membrane, which elongates and thus separates the chromosomes.