Which of the following pairs indicates the closest
macroevolutionary link among the bacteria according
to the evolutionary history tree in the text?
a. green sulfur; spirochetes
b. chlamydias; cyanobacteria
c. green sulfur; green nonsulfur
d. spirochetes; proteobacteria
e. proteobacteria; cyanobacteria
Answer: a
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Pyrimidines and purines can exist in alternate forms, or tautomers, shown here. Under common cellular conditions (physiological pH) the most common form of each purine or pyrimidine is shown on the left, and the rare tautomer on the right
Tautomers differ in the placement of hydrogen atoms and double bonds. Consider cytosine and its tautomer, the rare imino form of cytosine. With which nitrogenous base will the imino form of cytosine most likely base pair in a double stranded DNA? A. adenine B. cytosine C. guanine D. thymine E. uracil
Groundwater is water:
a. that runs over the ground and drains into a specific waterway b. in the ocean c. in lakes and rivers d. stored in ground containers such as man-made reservoirs e. in soil and aquifers
The first animals to show cephalization have several characteristics. Which of the following is NOT one of them?
a. These animals were triploblastic. b. These animals had a proboscis. c. These animals were in phylum Platyhelminthes. d. These animals are placed in the group Lophotrochozoa. e. These animals followed the protostome pattern of embryonic development
Which type of adaptation is most likely to occur over evolutionary time?
a) one that increases the physiological complexity and sophistication of the individuals in a population b) one that increases the physiological simplicity of the individuals in a population c) one that causes the individuals in a population to more closely resemble humans d) one that causes the individuals in a population to more efficiently reproduce in the environment in which they live e) one that causes the individuals in a population to have greater intelligence