A pro- strain of bacteria, which has not been in contact with any other strains, develops the ability to produce the amino acid proline. This mutant "rescue" could have been caused by
A. addition of the pro+ gene via transduction.
B. mutation of the pro- gene during phage integration.
C. removal of the pro- gene during excision.
D. addition of the pro+ gene via transformation.
E. correction of the pro- gene by reverse transcriptase.
A. addition of the pro+ gene via transduction.
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Which of the following may provide clues to the
evolution of sexual reproduction? a. similarities between mitosis and meiosis at the cellular level b. similarities between mitosis and meiosis at the molecular level c. gene products common to mitosis and meiosis that repair DNA d. gene products produced by an asexually reproducing species that are identical to those that serve in meiosis e. all of these
This nucleotide is found in RNA but not in DNA: ________
Fill in the blank(s) with correct word
Which of the following pairs is mismatched?
A) spirochete — axial filament B) aerobic, helical bacteria — gram-negative C) enterics — gram-negative D) mycobacteria — acid-fast E) Pseudomonas — gram-positive
What type of memory does language depend upon?
A. semantic B. long term C. episodic D. short-term E. skill