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.
Ans: d. They are connected into multinucleate tissues, allowing more efficient cell-to-cell communication.
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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.
In order to get around the lack of ability of prokaryotes to remove introns from precursor RNA, it may be necessary to
A. use the DNA directly. B. use the DNA after it has been processed. C. use different promoters. D. turn mRNA into cDNA. E. use the DNA directly AND use the DNA after it has been processed.
The sex chromosome composition of a person
with Turner syndrome is a. XXX. b. XO. c. XXY. d. XYY. e. none of these
If you mutate the gene encoding a Cdk such that Cdk protein product cannot bind to cyclin, what effect would you expect to see?
A) Cdk will be unaffected. B) The cell cycle will be up-regulated, and the cells will proliferate. C) Cdk will be inactive, so the target proteins will not be phosphorylated. D) Cdk will be constitutively active, so the cell cycle will be unchecked. E) Cdk will phosphorylate its target proteins regardless of the cell cycle.