When an endospore germinates, it gives rise to two daughter cells called vegetative cells.
Answer the following statement true (T) or false (F)
False
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The part of interphase when DNA is copied is the ____
a. G1 phase b. S phase c. G2 phase d. M phase e. R phase
DNA was not the first informational molecule in evolving cells. What choice best supports this statement?
a. Ribozymes were probably isolated in a vesicle resembling a living cell. b. Ribozymes act as catalysts for diverse reactions. c. Self-replicating molecules alone do not constitute life. d. DNA can replicate only with the help of enzymes, but the code for enzyme construction is found in the DNA. e. RNA appeared after hundreds of millions of years of prebiotic chemical synthesis
A fourth type of restriction enzyme is identified that cleaves at precise locations like a type II enzyme, but it also occasionally makes mistakes and cuts elsewhere. Would this type of enzyme be a useful enzyme to use in molecular cloning?
A. Yes, because it cuts correctly sometimes. B. No, because cutting mistakes could lead to incorrect cloning. C. No, because it is a precise enzyme. D. Yes, because cutting mistakes don't matter in molecular cloning.
Some patients who have suffered from polio develop symptoms 30-40 years later in the form of
A) repeated cold symptoms. B) meningitis. C) encephalitis. D) crippling deterioration and dysfunction in the polio-affected muscles. E) deterioration of the nerves that control polio-affected muscles.