Where does the step of the ornithine cycle in which urea is produced occur?
a. mitochondria
b. nucleus
c. cytosol
d. vacuoles
c. cytosol
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What is the main difference between mismatch repair (MMR) in eukaryotes and prokaryotes?
A. Eukaryotes lack a functional Mut H and Dam methylase. B. Eukaryotes have proteins homologous to MutS and MutH but not MutL. C. Eukaryotes only repair the lagging strand. D. Prokaryotic MMR can repair small loops of unpaired nucleotides, whereas eukaryotes cannot. E. Both use exonucleases to eliminate the mismatched strand but eukaryotes only require 3'-5' exonucleases.
Late log phase of the bacterial growth curve
A. is marked by the production of primary metabolites. B. is marked by the production of secondary metabolites. C. is a transition into the death phase. D. shows a decline in cell numbers.
Predict what would happen if the pulmonary vein returned blood to the right atrium.
A. The expected cardiac cycle would occur-this is the normal path. B. Abnormally high levels of oxygenated blood would be pushed into the systemic circuit. C. Oxygenated blood would be kept in a circular path between the heart and lungs-it would not reach the systemic circuit. D. Abnormally high levels of deoxygenated blood would be pushed into the systemic circuit.
Null mutations can also be called loss-of-function mutations because a __________
a. null mutation completely abolishes gene function b. null mutation is lethal c. loss-of-function mutation is lethal d. null mutation does not lead to a detectable change in the phenotype e. null mutation results in the acquisition of a new function