Schleiden and Schwann stated the "cell theory," which in its modern form says:
A. all cells will arise spontaneously, all cells require oxygen and all cells are composed of one or more cells.
B. all organisms are composed of one or more cells, all cells arise spontaneously and all cells vary in size and shape.
C. all organisms are composed of one or more cells, all cells require oxygen and all cells arise by division of other cells.
D. all organisms are composed of one or more cells, all cells are the smallest living things and all cells arise by division of other cells.
Answer: D
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A) monosaccharide B) disaccharide C) starch D) carbohydrate E) polysaccharide
Which of the following describes reinforcement of reproductive isolation?
A. The physical separation of two populations with diverging characteristics B. The reduced fitness of hybrid offspring C. The ability to identify and preferentially mate with only members of the same population D. An outbreak of disease that wipes out one of the two populations that would otherwise mate and form hybrid offspring
Which of the following statements about the differences between prokaryotic and eukaryotic genomes is FALSE?
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Which of the following types of contraception is the least effective?
A. RU486 B. the rhythm method C. condoms D. birth control pills E. All of these contraceptive methods are equally effective