The human body is composed of more than _______ different cells.

a. 100
b. 200
c. 400
d. 1000


Ans: b. 200

Biology & Microbiology

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Kinetic proofreading allows an enzyme to discriminate between two substrates by:

A. using a binding pocket of a specific size. B. using a multistep reaction and energy to reverse reactions. C. using a binding pocket of a specific shape. D. increasing the rate of the single chemical step of the reaction.

Biology & Microbiology

In a cross of Ff x Ff, the probability of having a dominant phenotype is

A. 2/3. B. 1/2. C. 1/3. D. 1/4. E. 3/4.

Biology & Microbiology

DNA chips are used

a. to sequence DNA. b. in DNA fingerprinting. c. to determine which genes are silent or are being expressed. d. in PCR. e. for all of these.

Biology & Microbiology

The first cells to encounter a threat to the body are

usually the _________ as they patrol body __________. a. neutrophils; surfaces b. macrophages; interstitial fluids c. mast cells; linings d. macrophages; tissues e. neutrophils; interstitial fluids

Biology & Microbiology