When carbon dioxide is low in the leaf, the Calvin cycle cannot proceed efficiently and the result is:
A. photorespiration
B. shutting down photosynthesis
C. cellular respiration
D. light-independent reactions
Answer: A
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Measurement of relative water content (RWC) can be used to predict a:
A. plant's ability to recover from cell collapsing B. wilted condition C. need for fertilizers D. cold shock E. salt tolerance
Which of the following assumptions is made by scientists who apply the concept of maximum parsimony?
a. Assume that the most obvious and simple way is correct. b. Assume that unexpected relationships are caused by mutations. c. Assume that most trait changes are typically undetectable. d. Assume that evolutionary modifications are branchpoints.
A single, weak contraction of a muscle fiber is called
a. an action potential. b. a muscle twitch. c. fatigue. d. tetanus. e. constriction.
Which of the following allows groups of skeletal muscle cells to perform coordinated contractions? (2 points)
a. Their sarcolemma is fused to the tendons, allowing them to function without continual nerve stimulation. b. Their cells are branched and joined end to end, allowing them to function without continual nerve stimulation. c. They contain a complex network of striations, allowing more efficient cell-to-cell communication d. They are connected into multinucleate tissues, allowing more efficient cell-to-cell communication.