Why must DNA fragments be denatured during the polymerase chain reaction?
A) Taq polymerase breaks down when heated.
B) The repeated gene sequences are not present in double-stranded DNA.
C) The primer must bind to a single-stranded template to synthesize double-stranded DNA.
D) VNTRs have DNA sequences that vary in number.
C
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Match the following items with the correct phrases.
_______1. When two microorganisms occupying the same environmental niche have absolutely no effect upon each other, it is known as ____________________. _______2. Bacterial vaginosis is an example of ____________________. _______3. ____________________ is a symbiotic relationship of benefit to one of the symbionts, but neither beneficial nor harmful to the other. _______4. ____________________ is a symbiotic relationship of benefit to one of the symbionts, and detrimental to the other. _______5. A lichen is a classic example of ____________________. a. commensalism b. mutualism c. neutralism d. parasitism e. synergism
Which biome has a layered structure that will
contain many vines and epiphytes?
a. chaparral b. tundra c. estuary d. taiga e. tropical rainforest
Once proteins are functional, they are no longer subject to cellular control.
Answer the following statement true (T) or false (F)
Which of the following statements is TRUE?
A) Heroin binds to endorphin receptors. B) Caffeine increases the effects of neurotransmitters that normally suppress nerve signals. C) Alcohol is a stimulant. D) Nicotine is a depressant.