The geneticist who discovered the white eye mutation in Drosophila and helped establish that genes are carried on chromosomes was
A. Janssens.
B. Morgan.
C. Sutton.
D. Mendel.
E. Sturtevant.
Answer: B
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Methane hydrates found at the bottom of the ocean ________.
A. float to the surface where they are consumed by methylotrophs B. vastly exceed in amount the world's current known natural gas reserves C. are only formed in areas of thermal heating D. All of the choices are correct.
Why aren't insect tracheae associated with capillary beds?
A. Insect capillaries are found only around the gut. B. Insects have an open circulatory system. C. Insects have external gills associated with hemolymph vessels. D. Insects use an air sac respiratory system.
___________, or water bears, have a reduced coelom and molt. Fill in the blank(s) with the appropriate word(s)
Why doesn't a tapeworm have a mouth on its scolex?
A. The mouth is on the proglottids. B. The mouth is located at the end of the pharynx. C. Tapeworms use a radula instead of a mouth to feed. D. Endoparasites don't need a mouth.