Which of the following is a source of methane?
A. Photosynthesis from halophiles in the Dead Sea
B. Degradation of cellulose and lignin by fungi
C. Decomposition of organic detritus on the forest floor
D. Gastrointestinal tract of cattle and sheep
E. All of these processes produce methane.
Answer: D
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In human blood groups, the fact that an individual can have an AB blood type is an example of ___________
A. incomplete dominance B. incomplete penetrance C. sex-influenced trait D. temperature-sensitive conditional allele E. codominance
Explain the reasoning behind the laws in some European countries that limit the number of children that can result from a single sperm donor. Do you agree with these restrictions? Why or why not?
What will be an ideal response?
The pathogenesis of Neisseria gonorrhoeae is dependent upon phase variation. Which of the following statements concerning phase variation is incorrect?
A. Phase variation allows Neisseria cells to escape immune detection. B. Phase variation involves alterations to the structure of the fimbriae. C. Phase variations results from genetic rearrangements in the Neisseria chromosome. D. Phase variation results in Neisseria cells adopting a pleomorphic morphology.
Which of the following vessels carries blood from the heart to the rest of the body?
A) the aorta B) the superior vena cava C) the inferior vena cava D) the pulmonary arteries E) capillaries