Cell numbers can be counted directly by all of the following EXCEPT

A) microscope counting chamber.
B) Coulter counter.
C) flow cytometer.
D) turbidity


Ans: D) turbidity

Biology & Microbiology

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Disulfide bonds are often found to stabilize which of the following levels of protein structure?

A) primary B) secondary C) tertiary D) all of the above E) none of the above

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Complementation studies can be performed in bacteria by

A) gene targeting. B) forming merodiploids with one copy of a bacterial gene on an F? plasmid. C) forming merodiploids with two copies of a bacterial gene on F? plasmids. D) forming diploids with two copies of the bacterial chromosome.

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In the dihybrid cross Aa Bb × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F1 offspring?

A) 1/4 B) 1/2 C) 3/4 D) All are heterozygotes. E) None are heterozygotes.

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Cultural differences have no effect on the way an international firm conducts its business around the globe.

a. true b. false

Biology & Microbiology