A covalent bond:a
forms only between identical atoms.
b. involves a sharing of only one pair of electrons.
c. is always polar.
d. may be polar or nonpolar depending on the atoms involved.
e. always forms between identical molecules.
D
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A stem on its side will turn up because
a. cells elongate on the down side. b. of gravitropism. c. statoliths sink to the gravity side of the stem. d. of the activity of auxin. e. of all of these.
Given that loci A and B in Drosophila are sex-linked and 20 map units apart, what phenotypic frequencies would you expect in male and female offspring resulting from the following crosses? (Assume that A and B are dominant to a and b, respectively
)
________ is a product of the liver. It contains water, ions, cholesterol, pigments, and salts that help in the digestion of lipids
Fill in the blank(s) with correct word
Pasteur used swan-neck flasks in his experiments to prove that
A. dust in air was a source of living microorganisms. B. microorganisms could cause disease. C. microorganisms could be grown in laboratory infusions. D. air had "vital forces" capable of spontaneous generation. E. microbial fermentation could be used to make wine.