________ is the total energy change that accompanies a chemical reaction.
A. Enthalpy
B. Free energy
C. Synergy
D. Entropy
Answer: A
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Mycorrhizae are
a. roots. b. bacteria. c. fungus roots. d. isolated plants. e. small animals found in agricultural soils
Which of the following features were required for the the evolution of the amphibians?
A. notochord, vertebrae, jaws, bony skeleton, lungs and 4 limbs B. notochord, vertebrae, jaws, bony skeleton, lungs and amniotic eggs C. notochord, mammary glands, jaws, bony skeleton, lungs and 4 limbs D. notochord, vertebrae, jaws, cartilaginous skeleton, lungs and 4 limbs
Down syndrome involves trisomy of chromosome number
a. 3. b. 5. c. 15. d. 19. e. 21.
The classic Hershey and Chase (1952 ) experiment that offered evidence in support of DNA being the genetic material in bacteriophages made use of which of the following labeled component(s)?
A) tritium B) hydrogen C) nitrogen and oxygen D) phosphorus and sulfur E) None of the answers listed is correct.