________ is the total energy change that accompanies a chemical reaction.

A. Synergy
B. Enthalpy
C. Free energy
D. Entropy


Answer: B

Biology & Microbiology

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Antibiotics are derived from all of the following, except ________.

A. Penicillium B. Bacillus C. Staphylococcus D. Cephalosporium E. Streptomyces

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In sickle cell anemia, affected individuals carry ____

a. one of several different nucleotide substitutions b. the same single nucleotide substitution c. more than one nucleotide substitution

d. a number of mutant alleles e. one mutant allele in several genes

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What is telomerase?

A. an enzyme that adds bases back to the tip of chromosomes every time a cell divides B. a chemical that allows the telophase stage of mitosis to proceed C. a chemical involved in RNA synthesis D. an enzyme that inhibits the formation of small blood vessels that feed a tumor E. a protein found in abundance on colon cancer cells

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Animals that weigh more than 100 pounds are considered as

A. extinct. B. sensitive species. C. megafauna. D. safe from extinction. E. endangered species.

Biology & Microbiology