BSCS Biology: A Molecular Approach

Chapter 1: The Chemistry of Life

General Chemistry

1.
Which of the molecules shown in the illustration is a compound?

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A)hydrogen
B)oxygen
C)water
D)both water and oxygen
2.
Which of the following subdivisions of matter is the smallest?
A)element
B)molecule
C)atom
D)proton
3.
Six main elements make up about what percentage of the compounds present in organisms?
A)about 10 percent
B)about 97 percent
C)about 3 percent
D)about 50 percent
4.
Which subatomic particle carries a negative electric charge?
A)the neutron
B)the proton
C)the electron
D)the isotope
5.
Atoms of the same element that differ in their number of neutrons are called what?
A)molecules
B)isotopes
C)inferences
D)neutron variances
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