A researcher can use BLAST for all of the following except
A) to compare gene sequences between species.
B) to compare DNA sequences within a species.
C) to compare nucleotide sequences within a species.
D) to compare carbohydrate compositions between species.
Answer: D
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The most important experimental result that suggested to Watson and Crick that DNA was in the form of a helix was
a. the finding of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C. b. Griffith's results with transformation. c. the discovery that DNA is wound around histone proteins. d. X-ray data from Rosalind Franklin . e. understanding DNA replication.
Which of the following human extraembryonic
membranes is the first site of blood cell formation and the source of germ cells? a. amnion b. yolk sac c. chorion d. allantois e. none of these
Which of the following can be used to help classify actinomycetes?
A. Phospholipid composition of the membrane B. Cell wall composition C. Percent G + C content D. All of these can be used to classify actinomycetes.
An inorganic ion that binds to an enzyme to help it function is called a
a. vitamin. b. cofactor. c. coenzyme. d. facilitator.