Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
A. oxygen
B. hydrogen
C. carbon
D. nitrogen
E. sulfur
C. carbon
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A mutation that results in premature termination of translation _____
A) is a silent mutation B) is a nonsense mutation C) usually has no effect on the function of the protein D) is a missense mutation
The only intermediate host required in the life cycle of blood flukes is a:
a. copepod. b. crustacean. c. freshwater snail. d. freshwater fish.
What is the role of pepsin?
a. it begins protein digestion in the stomach. b. it begins starch digestion in the oral cavity. c. it begins lipid digestion in the small intestine. d. it is a cofactor in enzymes that break down toxins. e. it is a cofactor in enzymes that break down hydrogen peroxide
Which of the following is an agent of the STD Chancroid?
What will be an ideal response?