A biologist doing a long-term study on a wild spider population observes increased variation in silk thickness. Which of the following could the spider population be experiencing?
A) directional selection
B) stabilizing selection
C) disruptive selection
D) genetic drift
C
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Which mutations can interfere with the proper insertion of a protein in the plasma membrane?
A. A polar amino acid to a non-polar amino acid within a transmembrane domain B. A non-polar amino acid to a polar amino acid within a transmembrane domain C. A polar amino acid to a non-polar amino acid within a cytoplasmic domain D. A non-polar amino acid to a polar amino acid within a cytoplasmic domain
The genetic material of a prokaryotic cell is located in its:
A. nucleolus. B. nucleus. C. nucleoid. D. nucleosome.
Actinomycetes are Gram-positive, spore-forming bacteria.
Answer the following statement true (T) or false (F)
Methylation regulates transcription
a. via the addition of a methyl group to cytosine bases of DNA. b. via the addition of a methyl group to cysteine residues on RNA polymerase II. c. via the addition of a methyl group to cysteine bases of DNA. d. via the addition of a methyl group to cytosine residues on RNA polymerase II. e. by interfering with the chromatin remodeling process.