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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The most abundant polymer in the world is:

a. cellulose. b. glucose. c. hemicellulose. d. lignin. e. pectin.

Biology & Microbiology