Epigenetic modifications affect the nucleotide sequence of the DNA
a. True
b. False
Indicate whether the statement is true or false
False
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Colds are common because
A. of the antigenic diversity of the rhinoviruses and the lack of long-lasting immunity. B. domestic animals serve as a persistent reservoir. C. there is a lack of effective antiviral drugs. D. immunity once obtained is not protective.
In a wilted leaf, the protoplast has shrunk away from the cell wall
a. True b. False
Most bacteriophages consist of only a coat and a core.
A. protein; nucleic acid B. protein; lipid C. polysaccharide; nucleic acid D. polysaccharide; protein E. lipid; protein
Which vein collects blood from the head, arms and chest?
a. inferior vena cava b. left pulmonary vein c. right pulmonary vein d. left pulmonary vein e. superior vena cava