________ is the total energy change that accompanies a chemical reaction.
A. Synergy
B. Enthalpy
C. Free energy
D. Entropy
Answer: B
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Antibiotics are derived from all of the following, except ________.
A. Penicillium B. Bacillus C. Staphylococcus D. Cephalosporium E. Streptomyces
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
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
Animals that weigh more than 100 pounds are considered as
A. extinct. B. sensitive species. C. megafauna. D. safe from extinction. E. endangered species.