A repair enzyme recognizes an incorrect structure in the DNA and directly converts it back to a correct structure. Which of the following DNA repair systems is responsible for the correction?
A. direct repair
B. methyl-directed mismatch repair
C. nucleotide excision repair
D. base excision repair
E. indirect repair
Answer: A
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Complementation experiments are used to determine if two observed mutations that are associated with the same trait are actually in the same gene
Indicate whether the statement is true or false
Regulation of genes between regulatory transcription factors and the RNA polymerase complex is mediated by
A) enhancers. B) silencers. C) cofactors. D) coactivators. E) sigma factors.
Most Gram-negative bacterial cells exhibit which of the following characteristics?
A) Thick layer of peptidoglycan without teichoic acids and large periplasmic space B) Thick layer of peptidoglycan with teichoic acids and small periplasmic space C) Thin layer of peptidoglycan without teichoic acids, large periplasmic space, and outer membrane
In the lab, you use a special balloon that is permeable to water but not sucrose to make an "artificial cell." The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60%
water. The solution in the balloon is ________ relative to the solution in the beaker. A) isotonic B) hypotonic C) hypertonic