Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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When two or more elements combine chemically, they form a(n)
a. | lipid. | b. | atom. | c. | element. | d. | compound. |
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2.
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Why is water important for a cell?
a. | Water is the main ingredient in DNA. | b. | All proteins are made of
water. | c. | Most chemical reactions in cells require water. | d. | Water is an
essential organic compound for the body. |
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3.
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All organic compounds contain the element
a. | water. | b. | oxygen. | c. | carbon. | d. | nitrogen. |
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4.
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Enzymes are important because they
a. | contain water. | b. | speed up chemical
reactions. | c. | contain genetic material. | d. | help the cell maintain its
shape. |
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5.
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Sugar molecules can combine with one another to form large molecules
called
a. | proteins. | b. | starches. | c. | enzymes. | d. | lipids. |
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6.
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Elements are related to compounds in that
a. | neither has atoms. | b. | compounds are made up of
elements. | c. | both are found only in living organisms. | d. | elements are made up
of compounds. |
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7.
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Which of the following is a lipid?
a. | fatty compounds of the cell membrane | c. | sugar | b. | insulin | d. | starch |
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8.
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Which substance is a protein?
a. | hemoglobin | c. | insulin | b. | melanin | d. | all of the
above |
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9.
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Which substance is a carbohydrate?
a. | corn | c. | fat | b. | fish muscles | d. | DNA |
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10.
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Which substances are a nucleic acids?
a. | vinegar | c. | DNA and RNA | b. | vitamin C | d. | all of the
above |
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