On the basis of this figure, multicellularity in plants and opisthokonts:
a. has the same evolutionary origin.
b. is independently derived in each lineage.
c. is fixed within the each lineage (all organisms are multicellular).
d. originated in the amoebozoa.
B
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When an enzyme-catalyzed reaction reaches equilibrium ____
a. the enzymes are now inhibited b. the chemical reactions cease c. the rate of the forward and reverse reactions are equal d. the concentration of reactants equals the concentration of products e. ATP is no longer required to drive the reaction
Which of the following is an example of a condition due to a chromosome structural abnormality?
a. muscular dystrophy b. sickle cell anemia c. Down syndrome d. cri du chat
Which of the following plant nutrients is
mismatched with its function?
a. nitrogen--component of nucleic acids b. phosphorous--component of proteins c. sulfur--component of chlorophyll d. iron--enzyme cofactor e. all of these plant nutrients are matched correctly with their functions
The reason that an action potential is so brief is that
a. a wave of repolarization immediately follows the rising portion of the spike. b. the closing of potassium gates allows the voltage difference across the neural membrane to be restored. c. the channels for sodium movement remain open. d. the sodium-potassium pump restores the electrical gradients. e. the membrane limits electrical activity.