The "common cold" is so common because
A) no immunity to the virus develops.
B) the highly variable parainfluenza virus causes colds.
C) a large number of coronaviruses cause it.
D) over 100 strains of rhinovirus cause colds.
E) 100+ strains of rhinovirus and several other types of virus cause "colds."
E
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A new nucleotide can only be added to the ____ of a growing DNA strand. DNA therefore always grows in the _____ direction
A. 3'; 5' to 3' B. 5'; 5' to 3' C. 3'; 3' to 5' D. 5'; 3' to 5'
Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
The nervous system develops enough to permit reflex actions during which period of development?
A. fetal, months 3-4 B. embryonic, weeks 2-3 C. embryonic, weeks 4-5 D. embryonic, weeks 6-8 E. pre-embryonic
What part of the DNA molecule is most exposed to the watery environment in the cell?
A) the flat, tightly stacked plates of the nucleotide bases B) the ionically-charged phosphate groups in the "backbone" C) the deoxyribose sugar alcohol groups in the "backbone" D) the hydrogen-bonding links between nucleotides