Living members of the ____ lineage include the sharks, skates, and rays, all of which have skeletons made entirely of
cartilage.
a. Petromyzontoidea
b. Chondrichthyes
c. Actinopterygii
d. Myxinoidea
e. Sarcopterygii
ANSWER: b
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Methanotrophs affect global temperature. This is because:
A. Methanotrophs metabolize methane, thereby reducing the amount of methane in the atmosphere. Since methane is one of the greenhouse gases whose accumulation causes a rise in global temperature, its reduction by methanotrophs helps prevent global warming. B. Methanotrophs convert methane to carbon dioxide and increase the amount of carbon dioxide in the atmosphere. Since carbon dioxide is one of the greenhouse gases whose accumulation causes a rise in global temperature, its production by methanotrophs contributes to global warming. C. Methanotrophs convert carbon dioxide to methane and increase the amount of methane in the atmosphere. Since methane is one of the greenhouse gases whose accumulation causes a rise in global temperature, its production by methanotrophs contributes to global warming. D. Methanotrophs convert methane to carbon dioxide, thereby decreasing the amount of methane in the environment but increasing the amount of carbon dioxide there. Since both methane and carbon dioxide are greenhouse gases whose accumulation causes a rise in global temperature, the decrease in one cancels the increase in the other and methanotrophs have no net effect on global warming. E. Methanotrophs combine carbon dioxide and methane to form petroleum and in this way take both methane and carbon dioxide out of the atmosphere. Since both methane and carbon dioxide are greenhouse gases whose accumulation causes a rise in global temperature, the decrease in both helps prevent global warming.
Imagine that you have data that shows that humans from a light-skinned population can exhibit greater similarity in DNA sequence with individuals from a dark-skinned population than with other individuals in the light-skinned population. Based on these hypothetical data, should these light- and dark-skinned human populations be considered separate species under the phylogenetic species concept? Why or why not?
A. Yes. Regardless of the DNA sequence data, they have different skin colors. B. No. The DNA sequence data do not support the conclusion that they represent different clades. C. Yes. The DNA sequence data conclusively show that they represent different clades. D. Maybe. It depends on whether the two populations can interbreed and produce viable offspring
Which of the following is NOT part of the peripheral nervous system:
a. the somatic nervous system b. the autonomic nervous system c. nerves branching out from the spinal cord d. the brain
Which of the following organisms causes plague?
A. Helicobacter pylori B. Campylobacter jejuni C. Yersinia pestis D. Bordetella pertussis