In the Ames test, gene mutation restores the ability of a bacterium to synthesize
A) epidermal growth factor.
B) histidine.
C) a polycyclic aromatic hydrocarbon.
D) a T lymphocyte inhibitor.
E) a DNA repair enzyme.
Answer: B
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Endosperm tissue arises by the fusion of a sperm nucleus with two nuclei of the:
A. male gametophyte B. female style C. ovule wall D. female egg E. female gametophyte central cell
DNA replication is
A. conservative. B. interspersive. C. semiconservative. D. chain reference.
In five Hfr strains, each of which was used to build a time-of-entry map, the genes entered the recipient cells as follows: Strain 1: S L A C T F Strain 2: N P F T C A Strain 3: T F P N U Y Strain 4: S H Y U N P Strain 5: U N P F T C Which of
the following represents a correct compilation of these results? A) S L A C T F P N H C U B) N P F T S L A C H U T C) T C A L S P N U Y H D) U N P F T C A L S T F E) S L A C T F P N U Y H
Which of the following statements is not true of proteins destined for the ER?
A) They have a signal sequence. B) The signal sequence for the ER consists of 15-30 amino acids. C) The proteins are modified with carbohydrates in the ER. D) The signal sequence is subsequently removed from the mature protein. E) The SRP binds to the protein and prevents entry into the ER until translation is completed.