The condition sickle cell anemia is due to

A) the insertion of an amino acid.
B) the deletion of an amino acid.
C) substitution of an amino acid.
D) failure to synthesize a hemoglobin molecule.
E) deletion of the ?-chain hemoglobin gene.


C) substitution of an amino acid.

Biology & Microbiology

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With enough time and in the absence of other evolutionary mechanisms, genetic drift will ________

A) reduce the genetic variation in a population B) increase the genetic variation in a population C) have no effect on the genetic variation of a population D) None of the above.

Biology & Microbiology

Which is the proper sequence of classification categories, moving from the largest to the smallest group of organisms?

A. kingdom, phylum, class, order, family, species, genus B. kingdom, phylum, family, class, order, genus C. kingdom, phylum, class, order, family, genus species D. kingdom, phylum, division, class, order, family, genus

Biology & Microbiology

The Lancefield grouping system ________.

A. is based on a DNA fingerprinting assay specific for streptococci B. depends on serological detection of polysaccharide and teichoic acid antigens and is used to identify ? -hemolytic streptococci C. is used to identify ?-hemolytic streptococci D. depends on serological detection of polysaccharide and teichoic acid antigens

Biology & Microbiology

One change that occurs within a sarcomere during muscle contraction is that the

A) thin filaments get thicker. B) thick filaments move closer together. C) Z lines move closer together. D) thick filaments get thicker.

Biology & Microbiology