What is methanogen?
A. An organism adapted to life in a highly salty environment
B. An organism that produces a highly salted substance
C. An organism adapted to life in a methane gas environment
D. An organism that produces methane gas as a metabolic by-product
E. An organism that produces methane and carbon dioxide as a metabolic by-product
Answer: D
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Of the following anatomical structures, which is homologous to the bones in the wing of a bird?
A. bony rays in the tail fin of a flying fish B. chitinous struts in the wing of a butterfly C. bones in the hind limb of a kangaroo D. bones in the flipper of a whale E. cartilage in the dorsal fin of a shark
Chronic myelogenous leukemia is an example of a cancer caused by __________________. Fill in the blank(s) with the appropriate word(s)
Which of the following is NOT used in gene therapy to transfer cloned DNA into human cells?
A. Retroviruses B. Fusion of cells with DNA-containing vesicles C. Microinjection D. Transformation E. Chemical means to get the DNA through the cell membrane
Unfilled positions within an electron orbital tend to make the atom
A. unreactive. B. neutral. C. less reactive. D. more reactive. E. stable.