Which substance usually undergoes tubular secretion?
a. salts
b. water
c. glucose
d. H+
e. urea
ANSWER: d
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Which of the following can the BLAST program use to identify homologous sequences in a database?
_____ DNA sequence _____ RNA sequence _____ Amino acid sequence _____ Protein molecular weight
You are working on a forensics team and collect some cells from a crime scene. The cells are angular, rigid, and have a cell wall made up of cellulose. This sample most likely came from a(n)
A. fungus. B. bacterium. C. protist. D. animal. E. plant.
Which of the following is true regarding primary growth in a plant?
a. Primary growth increases the height of a plant. b. Primary growth results in woody tissue. c. Primary growth arises from apical meristems. d. All the above are true. e. Only a and c are true.
If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be
A) 0.25x B) 0.5x C) x. D) 2x. E) 4x.