Proteins associated with DNA in the nucleus of eukaryotic cells are called ________.
Fill in the blank(s) with the appropriate word(s).
histones
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How does tryptophan, the end product of the trp operon, function in the regulation of the operon?
A) Trp binds to and inhibits the repressor, thus allowing transcription of the operon. B) Trp binds to and activates the repressor, which then binds to DNA to allow transcription of the operon. C) Trp binds directly to DNA and inhibits transcription of the operon. D) Trp binds to and changes the conformation of the repressor, which can then bind DNA and block transcription of the operon.
These data support the trade-off that
A) size of offspring is correlated with number of offspring. B) size of offspring is correlated with size of mother. C) number of offspring is correlated with survival. D) habitat type is correlated with size of mother.
A three-base sequence (loop) in tRNA that is complementary to a three-base sequence in mRNA is
A. a codon B. an anticodon C. a promoter D. a terminator E. an amino acid attachment site
The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is
A. osmosis. B. exocytosis. C. endocytosis. D. active transport. E. facilitated diffusion.