Chromosomes first become visible as two sister chromatids held together at the centromere during which one of the following phases?

A) G1
B) metaphase
C) S
D) prophase
E) anaphase


D

Biology & Microbiology

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The expression of thousands of genes simultaneously is easily accomplished using which of the following techniques?

A) siRNAs B) Northern blotting C) microarrays D) Eastern blotting E) PAGE analysis

Biology & Microbiology

Olfactory centers are responsive to

a. touch. b. smell. c. taste. d. sound. e. sight.

Biology & Microbiology

Which of the following statements concerning play is false?

a. It may be an example of imprinting. b. It may be a way of learning to coordinate movements. c. It may help animals learn social skills. d. It may be a way to practice adult behavior. e. It may function as a means of exercise.

Biology & Microbiology

Gametophyte plants produce 

A. spores. B. eggs. C. pollen. D. None of the above is correct.

Biology & Microbiology