Light levels in the _____ are too low to support photosynthesis.
Fill in the blank(s) with the appropriate word(s).
Answer: aphotic zone
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Which of the following can directly participate in creating the binding specificity of an enzyme active site? Choose all that apply
A. hydrophobic amino acid side chains B. hydrophilic amino acid side chains C. alpha helical regions of the polypeptide D. beta-sheet regions of the polypeptide E. negatively charged amino acid side chains F. positively charged amino acid side chains
Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. What is the experimental variable for this experiment?
a. chemical X b. fish c. river d. farming e. water
In the figure above, the HIV that infected more than 400 children in a Benghazi hospital:
a. is closely related to strains from Cameroon and Ghana. b. suggests that West Africa was a likely source of the strain that seeded the outbreak. c. suggests a single introduction was responsible for the outbreak in Benghazi. d. All of the above. e. A and C.
Ribozymes are:
a. capable of replicating RNA. c. capable of copying RNA into DNA. b. proteins. d. RNA enzymes.