Homologous structures are
A. structures of animals that appear to have evolved from different parts of their bodies.
B. structures of animals that have different appearances and functions but seem to have evolved from the same body part in a common ancestor.
C. structures of animals that have the same appearances and functions but obviously no common ancestor.
D. structures of animals that have different appearances and functions but different ancestors.
B. structures of animals that have different appearances and functions but seem to have evolved from the same body part in a common ancestor.
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The passage from the mouth to the anus is termed the
A. gut canal. B. oral cavity. C. grand canal. D. gastrointestinal tract.
A mutation in the gene encoding the enzyme that cuts F factor DNA during conjugation would result in
A. an inability to separate the recipient DNA from the donor DNA. B. an inability to draw the conjugated cells close enough to allow DNA transfer. C. the transfer of single-stranded DNA instead of double-stranded DNA. D. the inability of the donor DNA to move through the pilus. E. the inability of the recipient cell to replicate the F factor after transfer.
When a cell contains enough water that the plasma membrane presses tightly against the cell wall, it is said to be ____
a. palsmolytic b. tight c. wilted d. full e. turgid
In the figure above, diagram 1 represents
a. a molecule of chlorophyll. b. a phospholipid in the thylakoid membrane. c. a primary electron acceptor. d. an accessory pigment. e. a carotenoid.