Identical copies of genes that can be transcribed simultaneously are called
A. multigene families.
B. pseudogenes.
C. tandem clusters.
D. expressed sequences.
E. segmental duplications.
Answer: C
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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. base excision repair B. direct repair C. indirect repair D. nucleotide excision repair E. methyl-directed mismatch repair
Bacterial decomposition of organic nitrogen results in the production of:
a. ammonia. b. nitrates. c. nitrites. d. atmospheric nitrogen. e. urea.
Which of the following statements about the pathogen-specific response is true?
A. There is never a gene-for-gene response. B. If the R gene product is not triggered, no disease will occur. C. Avr and R gene pairs have been cloned in species pathogenized by microbes, fungi, and insects. D. The pathways involved always trigger the hypersensitive response. E. The pathogen is recognized by its avr gene product.
You are given a large tropical millipede to raise in a humid terrarium lined with soil and leaf litter. What should you feed it?
a. Insects b. Sliced apples and dead soft plant tissues c. Freshly cut wood d. Fresh meat or dog food e. All of the choices would be food for a millipede