Which of the following hormones promotes seed germination?
A) auxin
B) ethylene
C) gibberellin
D) abscisic acid
C
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As muscles contract, ________
a. actin heads bind to myosin filaments and slide them toward the middle of the sarcomere b. myosin heads bind to actin filaments and slide them toward the middle of the sarcomere c. myosin filaments change position d. filaments change length
Specifically, what does it mean that an amino
acid or a fatty acid is essential?
a. it is needed in large amounts by the body b. the body cannot survive without it c. the body cannot synthesize it d. it is an essential component of digestive enzymes e. more than one of these describes what it means to be essential
Which process, Figure A, B, or C, depicts activation and action of cytotoxic T-cells?
1.A
2.B
3.C
Phosphodiesterase catalyzes the conversion of:
a. a protein to a phosphorylated protein. b. GDP to GTP. c. cAMP to AMP. d. IP3 to PIP2. e. calcium to calcium-calmodulm