If you isolate a single nucleotide from a nucleic acid chain and determine that the nitrogenous ring structure is cytosine, you could say with certainty that the nucleotide could have come from:
A. DNA but not RNA.
B. RNA but not DNA.
C. either DNA or RNA.
D. neither DNA nor RNA.
E. double-stranded DNA but not single- stranded DNA.
Answer: C
Biology & Microbiology
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Down syndrome involves trisomy ____.
A. 3 B. 5 C. 15 D. 19 E. 21
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Apoptosis through the extrinsic pathway is activated by factors such as lack of oxygen or growth factors.
Answer the following statement true (T) or false (F)
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Which of the following represents an abnormal electrolyte serum level?
A) Sodium, 140 mEq/L B) Potassium, 6 mEq/L C) Calcium, 9.5 mEq/L D) Magnesium, 1.7 mEq/L
Biology & Microbiology