Which blood cell type is correctly matched to its function?
A. Platelets-hematopoiesis
B. Erythrocytes-immunity
C. Leukocytes-oxygen transport
D. Leukocytes-blood clotting
E. Monocytes-defense against microorganisms
Answer: E
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An intermediate in the creation of DNA nucleotides is ribose 5-phosphate, shown here. What enzymatic activity is needed to ready ribose 5-phosphate for use in DNA nucleotide synthesis?
A. DNase B. reductase C. oxygenase D. RNase E. RNA polymerase
Peptone
A. refers to a hydrolysate of carbohydrates used in growth media. B. refers to a hydrolysate of proteins used in growth media. C. consists of a water extract of beef. D. consists of a mix of monosaccharides and oligosaccharides. E. refers to a hydrolysate of proteins used in growth media AND consists of a water extract of beef.
Spontaneous development of resistance to a particular antimicrobial is difficult if the drug
A. binds to several sites on the target molecule. B. targets several different molecules. C. affects only one molecule. D. affects the plasma membrane. E. binds to several sites on the target molecule AND targets several different molecules.
Why don't all changes in DNA result in mutations? a. Mutations are never expressed
b. None of these choices. c. The cell never makes a mistake during transcription. d. The cell never makes a mistake during translation. e. The same amino acid can be produced by a variety of codons.