A mutant bacterial cell has a defective aminoacyl-tRNA synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine. The consequence of this for the cell will be that _____
A) none of the proteins in the cell will contain phenylalanine
B) proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU
C) the cell will compensate for the defect by attaching phenylalanine to tRNAs with lysine-specifying anticodons
D) the ribosome will skip a codon every time a UUU is encountered
B
You might also like to view...
Tunde is worried that she has diabetes since a lot of her family has it. Which of the following blood findings would set her mind most at ease?
A) 400 mg/dl glucose B) 90 mg/dl glucose C) 30% Hb A1c hemoglobin D) 9% Hb A1c hemoglobin
A stroke volume in the heart of 70 mL/cycle, with a pulse of 72 cycles per minute, results in a cardiac output of
A) 5 L/minute. B) 504 mL/minute. C) 0.5 L/minute. D) 50 L/minute. E) 500 L/minute.
Lysozyme and the antibiotic penicillin have similar mechanisms of action in that they both cause damage to the bacterial
A) cell membrane. B) capsule. C) cell wall. D) DNA. E) ribosomes.
Lederberg and Tatum's experiments demonstrated that
A. the genetic transfer occurred when the bio+, met+ phe-thr- strain transferred DNA to the bio-met- strain. B. bacteria must be in physical contact in order for bacteria to exchange genetic material. C. bacteria do not release DNA into the environment for other bacteria to take up. D. bacteria can acquire genetic material from each other. E. All of these observations were made by Lederberg and Tatum.