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.
A
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An evolutionary advantage of the endoskeleton is that it (choose all correct answer options):
A. allows growth of fairly large organisms. B. protects vital internal organs. C. provides a structure on which muscles can pull for an organism to move. D. makes the process of reproduction more efficient.
Water is required to drive which of the following reactions?
A) The light reactions only B) The Calvin cycle only C) Both the light reactions and the Calvin cycle D) Neither the light reactions nor the Calvin cycle
The macrolide erythromycin works by
A) Inhibiting the binding of aminoacyl-tRNA molecules to the A site of ribosomes B) Binding to the small ribosomal subunit to interfere with protein synthesis C) Inhibiting peptide chain elongation during protein synthesis D) Inhibiting the peptidyl transferase reaction
Action potentials traveling down the plasma membrane of a muscle fiber will next reach the _____ after leaving the T tubules.
A. mitochondria B. neuromuscular junction C. cytoskeletal system D. sarcoplasmic reticulum E. endomembrane system