Ribozymes were discovered ________ protein enzymes, even though they ________
A) before; only catalyze one type of cellular reaction
B) before; are more heat labile than protein enzymes
C) after; catalyze many important cellular reactions
D) after; are the only catalysts found in bacteria and archaea
E) at the same time as; only catalyze one type of cellular reaction
Answer: C
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Acquired immune tolerance is the body's ability to produce T cells and antibodies against antigens such as microbial antigens, while "tolerating" ________.
Fill in the blank(s) with the appropriate word(s).
Miller's reaction chamber contained gases intended to simulate the atmosphere of the ancient Earth. Which gas was
NOT included in this chamber? a. carbon dioxide b. methane c. ammonia d. water vapor e. hydrogen gas
Which of the following statements regarding microbes and human breast milk are correct?
a. Human breast milk is sterile b. Human breast milk contains around 600 species of bacteria c. Carbohydrates in human milk are used by the baby's gut microbes d. Human milk contains many sugars that the baby digest easily
In mismatch repair on newly replicated DNA, enzymes distinguish between old and newly replicated DNA strands based on the fact that newly replicated DNA strands are ________-methylated relative to older DNA.
Fill in the blank(s) with the appropriate word(s).