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
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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
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.
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
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