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

Biology & Microbiology

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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

Biology & Microbiology

Chronic myelogenous leukemia is an example of a cancer caused by __________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

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

Biology & Microbiology

Unfilled positions within an electron orbital tend to make the atom

A. unreactive. B. neutral. C. less reactive. D. more reactive. E. stable.

Biology & Microbiology