Why is an enzyme from a thermophilic bacterium used in PCR?
A. It is cheaper to obtain from live microorganisms than producing the enzyme in a lab.
B. This thermohile's enzyme will synthesize DNA.
C. The enzyme makes DNA that is more similar to human DNA.
D. DNA is replicated at a high temperature that denatures most proteins.
Answer: D
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Which statement describes the functioning of photosystem II?
A) Light energy excites electrons in the thylakoid membrane electron transport chain. B) Photons are passed along to a reaction-center chlorophyll. C) The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH. D) The electron vacancies in P680+ are filled by electrons derived from water. E) The splitting of water yields molecular carbon dioxide as a by-product.
When bacteria flourish and grow in the blood stream, the condition is termed ________.
A. viremia B. fungemia C. sepsis D. bactocarditis
The concentration of Waste molecules is ________ inside the cell compared to the outside.
a) Higher b) About the same c) Lower
A stimulus that is strong enough to trigger an action potential is said to be above
A) intensity. B) threshold. C) maximum. D) frequency. E) capacity.