Scientists can induce, or cause, mutations in DNA in a laboratory setting. What evidence would best support a scientist's claim that a certain mutation induced in a lab would have no phenotypic effect if it occurred in an actual organism?
A) The mutation affects an entire chromosome.
B) The mutation is an insertion mutation.
C) The mutation is in a gene that codes for an essential protein.
D) The mutation does not change the protein generated by this gene
Ans: D) The mutation does not change the protein generated by this gene
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The protein responsible for cystic fibrosis is
a. found on the inside of cells. b. the same in normal individuals and those with cystic fibrosis. c. responsible for blocking normal fluid transport across the cell membrane. d. a carcinogen. e. the result of a normal gene.
A person with B positive blood will have
A. B antigens, antibodies to A, and no Rh antigens. B. B antigens, antibodies to B, and Rh antigens. C. B antibodies, antibodies to A, and Rh antigens. D. A antigens, antibodies to B, and Rh antigens. E. B antigens, antibodies to A, and Rh antigens.
Which of the following statements concerning osmosis is FALSE?
A. Osmosis requires a selectively permeable membrane. B. During osmosis, water crosses to the side of the membrane with a lower solute concentration. C. Cells placed in hypotonic solutions will gain water. D. Crenation results when blood cells are placed in a hypertonic solution. E. Osmosis stops when the system reaches equilibrium.
Which of the following is NOT true of DNA-binding proteins?
a. Many are dimers that combine with two sites on the DNA. b. Regulatory proteins often bind inverted repeats on DNA. c. A leucine zipper is a common domain to maintain proper conformation. d. Most bind to DNA in a nonspecific manner.