Which structure is a covering for the gill chamber in ray-finned fishes?
a. swim bladder
b. spiral valve
c. operculum
d. atrium
e. lateral-line system
ANSWER: c
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DNA replication occurs in the 5' to 3' direction; that is, new nucleoside triphosphates are added to the 3' end
Indicate whether the statement is true or false
Why is it more likely that coincidental homologies (i.e., similarities that are just by chance) are statistically more likely to occur with DNA than protein comparisons between species?
What will be an ideal response?
A primary source of carbon for photosynthetic organisms is:
a. carbon dioxide in the atmosphere and water. b. bicarbonate in the water. c. nitrate in the soil. d. dissolved phosphate in water. e. carbonic acid in rain.
What is an adaptive advantage of recombination between linked genes?
A) Recombination is required for independent assortment. B) Recombination must occur or genes will not assort independently. C) New allele combinations are acted upon by natural selection. D) The forces on the cell during meiosis II results in recombination.