Which type of covalent bond allows for rotation about the bond axis?
A.) single
B.) triple
C.) double
D.) hydrogen
Ans: A.) single
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Lateral inhibition via amacrine cells in the mammalian retina _____
A) underlies habituation of vision B) enhances visual contrast C) prevents bleaching in bright light D) is required for color vision to occur E) recycles neurotransmitter molecules
The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell trait is an example of _____
a. natural selection b. genetic drift c. spontaneous mutational spread d. heterozygote disadvantage e. the founder effect
The portion of the cytoskeleton that attaches, pulls, and guides the chromosomes during cell division is the
A. kinetochore. B. Golgi body. C. mitotic spindle. D. centrosome. E. centromere.
How many of these species probably have a cell wall that consists partly of an outer membrane of lipopolysaccharide?
A) only one species B) two species C) three species D) four species