In studying an E. coli strain containing a known frameshift mutation, you isolate a mutant in which this frameshift is suppressed. You therefore expect to find which of the following associated with the suppression? (Assume the frameshift has not been corrected in the coding for the peptide.)
A) suppressor tRNAs encode an amino acid for a stop signal
B) suppressor tRNAs encode a four-nucleotide anticodon
C) suppressor tRNAs encode a two-nucleotide anticodon
D) both choices B and C
E) all of the above
D) both choices B and C
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Which of the following are examples of biogenic amines?
A. epinephrine and endorphins B. GABA and serotonin C. epinephrine, dopamine, and GABA D. epinephrine, dopamine, and serotonin E. epinephrine, norepinephrine, dopamine, and serotonin
Almost all enzymes are
a. carbohydrates. b. proteins. c. lipids. d. nucleic acids. e. amino acids.
Which of the following statements about the protein calmodulin is TRUE?
It interacts directly with the ligand receptor. It interacts directly with the G protein. It binds to Ca 2+ ions to mediate a cellular response. It binds to the Ca 2+ ion channel causing it to close. It induces ATP hydrolysis.
Prior to hunting, the population likely had more alleles for the 47 genes.
a. true b. false