How does a gastrovascular cavity differ from a
complete digestive tract?
a. a gastrovascular cavity has an opening that
serves as a mouth and an anus
b. the complete digestive process is slower in
a gastrovascular cavity
c. there is less specialization of parts in a
gastrovascular cavity
d. the four functions of digestion are not
simulataneous in a gastrovascular cavity as
they are in a complete digestive tract
e. all of these are differences between a
gastrovascular cavity and a complete
digestive tract
E
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Which of these five evolutionary forces is rare and usually not considered by population geneticists?
A. mutation B. selection C. non-random mating D. genetic drift E. immigration
Atoms of a single element that possess different numbers of neutrons are called:
A. isomers. B. polymers. C. ions. D. isotopes. E. monomers.
The place where RNA polymerase first associates with DNA so that transcription can begin is called
the ____ and is located ____ of the transcribed region.
a. promoter; upstream b. initiator; downstream c. initiator; upstream d. promoter; downstream e. intron; downstream
Placoid scales are found on:
a. fleshy-finned fishes. b. cartilaginous fishes. c. ray-finned fishes. d. lampreys. e. hagfishes