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1 | |
The smallest unit of matter with unique characteristics is |
| | A) | an electron |
| | B) | a molecule |
| | C) | an atom |
| | D) | the nucleus |
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2 | |
The _____ charge of a proton is exactly balanced by the _____ charge of a (an) ________. |
| | A) | negative, positive, electron |
| | B) | positive, neutral, neutron |
| | C) | positive, negative, electron |
| | D) | neutral, negative, electron |
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3 | |
Electrons move around the nucleus of an atom in pathways called |
| | A) | shells |
| | B) | orbitals |
| | C) | circles |
| | D) | rings |
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4 | |
The atomic weight of an element is about ____ as large as its atomic number. |
| | A) | 4 times |
| | B) | 3 times |
| | C) | 2 times |
| | D) | It is not larger, it is the same |
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5 | |
The number of electrons of an atom is automatically known if one knows the |
| | A) | atomic number |
| | B) | atomic weight |
| | C) | number of orbitals |
| | D) | valence |
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6 | |
Bonds in which atoms share electrons are defined as _____ bonds. |
| | A) | hydrogen |
| | B) | ionic |
| | C) | double |
| | D) | covalent |
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7 | |
An atom that donates electrons during a reaction is called |
| | A) | an oxidizing agent |
| | B) | a reducing agent |
| | C) | an ionic agent |
| | D) | an electrolyte |
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8 | |
A substance that releases H+ into a solution |
| | A) | is a base |
| | B) | is ionized |
| | C) | is an acid |
| | D) | has a high pH |
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9 | |
A solution with a pH of 2 _____than a solution with a pH of 8. |
| | A) | has fewer H+ |
| | B) | has more H+ |
| | C) | is more concentrated |
| | D) | is less concentrated |
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10 | |
The monomer unit of polysaccharides such as starch and cellulose is |
| | A) | fructose |
| | B) | glucose |
| | C) | ribose |
| | D) | lactose |
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11 | |
DNA is a hereditary molecule that is composed of |
| | A) | deoxyribose, phosphate, and nitrogen bases |
| | B) | deoxyribose, a pentose, and nucleic acids |
| | C) | sugar, proteins and thymine |
| | D) | adenine, phosphate, and ribose |
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12 | |
What is meant by DNA replication? |
| | A) | Duplication of the sugar-phosphate backbone |
| | B) | Matching of the base pairs |
| | C) | Formation of the double helix |
| | D) | The exact copying of the DNA code into two new molecules |
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2002 McGraw-Hill Higher Education