Torsion may be an adaptation in __________ that allows the __________ to be withdrawn first into
the shell.
A. bivalves; foot
B. bivalves; head
C. gastropods; foot
D. gastropods; head
E. cephalopods; head
D
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What technical advance allowed Walther Flemming and other scientists of his generation to better understand the stages of mitosis and meiosis?
A. the ability to obtain single cells B. the ability to slice cells thinly C. microscopes with two eyepieces D. microscopes with high-quality oil immersion lens E. electron microscopes
Yellow fever is transmitted by
A. ticks. B. fleas. C. Anopheles mosquitoes. D. Aedes mosquitoes.
What is the most common reason that some people oppose environmental protection? a. They fear the economic consequences
b. They do not care about the environment. c. They want to profit from biological wealth. d. They are more interested in cultural wealth.
Compared with eukaryotic chromosomes, bacterial chromosomes are ________
A) large, mainly organized in single-gene transcription units without introns B) large, triple-helix, Z-DNA, organized in single gene units with introns C) small, mainly organized in single-gene transcription units with introns D) large, mainly organized in polygenic transcription units without introns E) small, with high gene density