The chemical group in box 5 of the accompanying figure is a:
a. hydrogen bond.
b. phosphate.
c. nucleotide.
d. pyrimidine.
e. protein
b
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Which of the following is a tree with needleshaped
leaves that are adaptations that minimize water loss?
a. cacti b. conifer c. broadleaf evergreen d. deciduous angiosperms e. mesquite
From X-ray diffraction data, which of the
following was determined about DNA?
a. The amount of adenine equaled the amount of thymine. b. Different species have different proportions of adenine and guanine. c. Nitrogen containing bases were arranged on the outside of the double helix structure. d. The shape of the molecule could be a double helix. e. All of these were determined
Which effect of vaccination is essential for future response to viral infections?
What will be an ideal response?
After ONE round of DNA replication in Meselson and Stahl's classic experiment, ________
A) the conservative model was conclusively proven to be an inaccurate model B) the semiconservative model was conclusively proven to be the accurate model C) both the conservative and the semiconservative models were still possibilities D) all three models of replication were still possibilities E) the dispersive model was conclusively proven to be an inaccurate model