What is meant by the term photoreactivation repair?
What will be an ideal response?
Photoreactivation repair, discovered in 1949, is a process described in E. coli in which UV-induced DNA damage can be partially reversed if cells are briefly exposed to light in the blue range of the visible spectrum.
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Select the incorrect statement related to sarcomere structure and function.
A. Two Z lines form the opposite borders of one sarcomere. B. Thin filaments are not present in the H band of a sarcomere. C. I bands consist of both thin and thick filaments. D. Stacks of thick filaments produce dark bands, called the A band. E. Sacromeres are the smallest subunits of muscle contraction.
The products of genes that are switched on in
specific tissues at specific stages of development affect mainly a. gene replication. b. gene transcription. c. mRNA transcript processing. d. translation. e. post-translational processing of proteins
Complementary base-pairing allows for
A) spontaneous mutations to occur. B) genes to be expressed as a phenotype. C) DNA to serve as its own template for replication. D) replication to be semiconservative. E) covalent bonds to form between the opposite bases.
In the absence of tryptophan, __________
A) the inactive repressor cannot bind trpO, so operon gene transcription occurs B) the active repressor binds trpP, so operon gene transcription is repressed C) the inducer cannot bind trpO, so operon gene transcription occurs D) the active repressor cannot bind trpO, so operon gene transcription is attenuated E) the repressor binds the corepressor, and operon gene transcription occurs