What mechanism is used to finely tune enzyme activity according to the needs of the cell?

A) enzyme specificity B) competitive inhibition
C) allosteric regulation D) coupled reactions


Answer: C

Biology & Microbiology

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Effective immunogens generally have a molecular weight of ________ or greater

A) 1,000 B) 5,000 C) 7,500 D) 10,000

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Which of the following events occurs directly after a DNA molecule is unzipped?

A.) Mismatched nucleotide bases are identified and replaced. B.) Free-floating nucleotides pair up with exposed bases. C.) Identical double-stranded DNA molecules are formed. D.) Enzymes break hydrogen bonds between base pairs.

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At which gestational age does a developing human fetus first look obviously human and not like other vertebrate embryos?

A) 2 weeks B) 4 weeks C) 9 weeks D) 4 months

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A Gram-positive psychrotrophic rod ________ is a frequent contaminant of dairy products and meat and survives phagocytosis.

A. Escherichia coli B. Mycobacterium leprae C. Clostridium perfringens D. Bacillus thuringiensis E. Listeria monocytogenes

Biology & Microbiology