Which of the following sequences correctly represents the phytochrome signal transduction pathway?
a. red light ? PIF3 activation ? PIF3 into nucleus ? light-responsive gene switched off
b. red light ? Pfr to Pr ? Pr into nucleus ? Pr-PIF3 complex ? light-responsive gene regulation
c. UV light ? PIF3 into nucleus ? light responsive gene produces phytochrome ? Pr to Pfr
d. blue light ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation
e. red light ? Pr to Pfr ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation
e
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A 1,4-glycosidic linkage would refer to which one of the following?
A. hydrogen bonding between carbon 1 and carbon 4 within a monosaccharide B. the covalent bond between the 1' carbon of one nucleotide and the 4' carbon of a second nucleotide C. the covalent bond between amino acid 1 in one protein and amino acid 4 in a second protein D. hydrogen bonding among the four bases in double-stranded DNA E. the covalent bond between carbon 1 of one monosaccharide and carbon 4 of a second monosaccharide
Most CO2 reacts with water inside red blood cells to form bicarbonate, due to the activity of
__________. Fill in the blank(s) with the appropriate word(s).
Which of the following happens when a cell divides?
A) It becomes more difficult for the cell to get enough oxygen and nutrients. B) The cell's volume increases. C) Each daughter cell receives its own copy of the parent cell's DNA. D) It becomes more difficult for the cell to get rid of wastes.
List the functions of proteins.
What will be an ideal response?