In male humans, crossing-over between the X and Y chromosomes occurs at the
a. male-specific region.
b. ampliconic regions.
c. X-transposed regions.
d. X-degenerate regions.
e. pseudoautosomal regions.
Ans: e
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A mutation that changes a codon sequence, and subsequently changes the amino acid that should have been placed at that point in the polypeptide chain, is a
A) frameshift mutation. B) missense mutation. C) silent mutation. D) nonsense mutation.
Which of the following is NOT a characteristic of the
plants with which Mendel worked? a. They produce male and female parts. b. They exhibit blending inheritance. c. They normally self-fertilize. d. They have many different contrasting traits and exhibit some pure-breeding varieties. e. They can easily be cross-fertilized by human manipulation.
Organisms that consume producers are ________
A) detritivores B) decomposers C) primary consumers D) producers
Nucleotides in each strand of DNA are held together by what type of bonds?
a. ionic b. phosphodiester c. peptide d. hydrogen