A ribozyme catalyzes a reaction on itself and actually changes shape. This is an example of
A. intra-enzyme reactions.
B. inter-enzyme reactions.
C. intramolecular catalysis.
D. intermolecular catalysis.
C
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A pregnant woman had contact with her nephew who was just diagnosed with a rubella infection. Acute and convalescent samples were taken, which resulted in an acute titer of 1:16 and a con-valescent titer of 1:32 . Which one of the following comments explains the risk to the fetus?
a. The risk is low; a fourfold rise in titer is not present. b. The risk is high; more than a fourfold rise is present in titer. c. The risk is high because both titers are elevated. d. Rubella is not a congenital disease; there-fore the test should not have been ordered.
A patient has a stroke that leaves him unable to hear. Where is the most likely location of the brain damage?
a. limbic association cortex b. prefrontal association cortex c. Wernicke's area d. temporal lobe e. somatosensory cortex
How and where is ATP made in a eukaryotic cell?
A. ATP can be made by direct phosphorylation of ADP in the cytoplasm, and by an enzyme complex that uses the energy from a proton gradient to drive ATP synthesis in the mitochondria. It can also be made in other locations in the cell, depending on the cell type. B. ATP is made in all compartments of the cell in response to endergonic reactions and is used to drive exergonic reactions in the cell. C. ATP is only made in the mitochondria in response to chemiosmosis. D. ATP can be made by an enzyme complex that uses the energy of protons moving down their concentration gradient from the mitochondrial matrix to the cytoplasm to make the ATP.
You are examining a rigid plant tissue; it does not flex or bend. Tests show that it is not consuming oxygen gas, as would be expected if aerobic respiration were occurring. This tissue is probably
A) collenchyma. B) phloem. C) epidermis. D) sclerenchyma. E) parenchyma.