Adenoviruses are
A. causes of outbreaks among military recruits.
B. nonenveloped, double-stranded, DNA viruses.
C. causes of conjunctivitis, common cold, and an acute hemorrhagic cystitis in children.
D. transmitted by respiratory and ocular secretions.
E. All of the choices are correct.
Answer: E
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Methanotrophs affect global temperature. This is because:
A. Methanotrophs use oxygen produced by plants to 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.
What type of bond forms between the amino acids to create a protein? a. Peptide b. Ionic c. Covalent d. None of these choices
e. Hydrogen
A decrease in pressure within an arteriole will initiate a(n)
A) myogenic response. B) cardiac and venous baroreceptor reflex. C) arterial baroreceptor reflex. D) active hyperemia. E) sinus arrhythmia
What does the mesoderm have to do with the designation of a true coelom?
A. The mesoderm has nothing to do with the coelom. B. The mesoderm gives rise to the fluid found within the coelom. C. The mesoderm gives rise to the structure of the coelom wall. D. The mesoderm gives rise to the lining of the coelom. E. The mesoderm gives rise to the outer covering of the coelom.