Meselson and Stahl distinguished between parental and newly-synthesized DNA by using
A) heavy metal.
B) heavy and light forms of nitrogen.
C) nucleic acid dyes.
D) chromosome paints.
B) heavy and light forms of nitrogen.
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The neuron transport proteins that maintain the resting membrane potential and restore ion gradients following an action p
otential are ____. a. sodium-phosphorus passive transporters b. sodium-potassium pumps c. sodium-chlorine gated channels d. phosphorus-calcium pumps e. phosphorus-chlorine gated channels
A salt is a compound in which the hydrogen ion of ____ is replaced by some other cation
a. water b. a base c. an acid d. an anion e. a hydroxide ion
Polyphagous parasites feed on
A. any plant species. B. many different host species. C. ectoparasites. D. parasitoids. E. a single host species.
Living as a member of a group may have all of the following advantages except what?
A. increased feeding rate B. members learn about new food sources from other members C. greater protection from predators D. more individuals scan the environment for dangers E. being more resistant to disease and parasites