The base-pairing error rate remains low during replication because
A) DNA repair mechanisms can fix the mispaired bases.
B) bases that are mispaired can excise themselves.
C) UV light radiation corrects any base mispairs.
D) mispaired bases cause a cell to die before replication is complete.
E) None of these; base-pairing errors are not possible
A
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The most common vectors used in DNA therapy experiments are _____
a. modified human cells b. retroviruses and adenoviruses c. antisense oligonucleotides (AONs) d. bacteria e. naked DNA
How is pollentube elongation facilitated?
a. Pollen tube growth relies onchemical signals released by the pollen grain. b. Pollentube elongation will occur as long as the pistil provides moisture and energy. c. Chemical cues from female tissues help guide pollen tube growth, but the identity of these chemicals is not known. d. All the details of the chemical interactions between the pollen tube and pistil tissue have been elucidated and are well-described. e. Pollentube elongation occurs only in the absence of chemical cues from the female tissues.
Electrical impulses are transmitted between components of the central nervous system via which one of the following?
A) glial cells B) motor neurons C) sensory neurons D) interneurons E) macrophages
You have isolated a cell which contains murein. What other structure(s) can you safely assume this cell has?
A. a cell membrane B. all of the above C. a plasmid D. a pili E. a mitochondrion