A calorie is the commonly used unit of chemical energy. It is also the unit of
A. light.
B. magnetism.
C. sound.
D. heat.
E. radioactivity.
D
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In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. Photosystem I B. Photosystem II C. Photosystem III D. Photosystem I and II E. Photosystem I, II and III
A dihybrid has the genotype AaBb. The diagram depicts the chromosome composition of different cells from the animal. Which of the cells could represent a mature gamete?
A) Cell G B) Cell H C) Cell K D) Cell M E) Cell P
Arrange the events of muscular contraction in chronological order
1) muscle shortens 2) calcium binds to troponin 3) filaments slide 4) T tubules are depolarized 5) acetylcholine is released 6) ATP molecule is split a. 4 ? 5 ? 2 ? 1 ? 3 ? 6 b. 4 ? 2 ? 5 ? 6 ? 1 ? 3 c. 5 ? 2 ? 4 ? 1 ? 6 ? 3 d. 6 ? 1 ? 5 ? 4 ? 3 ? 2 e. 5 ? 4 ? 2 ? 6 ? 3 ? 1
The most abundant polymer in the world is:
a. cellulose. b. glucose. c. hemicellulose. d. lignin. e. pectin.