When a plant moves sugars from its leaves to its roots, the sink is the
a) leaves.
b) roots.
c) stems.
d) same as the source.
Answer: b) roots.
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The upstream activator sequence for the GAL genes (UASGAL) is recognized by:
A. Gal80p. B. Gal3p. C. Mig1. D. Gal4p.
The yolk, which is in many animal eggs, is
composed of
a. a mixture of individual amino acids and nucleic acids. b. a mixture of proteins and lipids. c. a mixture of proteins and carbohydrates. d. a mixture of nucleic acids and proteins. e. a mixture of lipids and nucleic acids
What makes the "head" of a phospholipid hydrophilic?
A) The even distribution of electrons across the fatty acids makes the head polar. B) The uneven distribution of electrons across the fatty acids makes the head polar. C) The phosphate group carries a negative charge, making the head polar. D) The phosphate group carries a negative charge, making the head nonpolar
Which grouping of elements is found in carbohydrates?
A. N - S - O B. Ca - H - O C. C - H - P D. C - H - O E. H - O - Cl