Chemistry of Living Things Test Review

Which substance plays a major role in most of the chemical reactions that occur in a living cell?

• water

• glycogen

• glycerol

• maltose

Which statement describes starches, fats, proteins, and

DNA?

• They are used to store genetic information

• They are complex molecules made from

  smaller molecules

• They are used to assemble larger inorganic

  materials

• They are simple molecules used as energy sources.

Proteins, starch, and DNA are similar in that they are all

• organic compounds

• parts of genes

• made of amino acids

• made of simple sugars

A chemical analysis of organisms from each kingdom

shows that living things are primarily composed of

the elements

• carbon, hydrogen, chlorine, and sulfur

• carbon, hydrogen, oxygen, and nitrogen

• iron, calcium, hydrogen, and oxygen

• chlorine, carbon, calcium, and sulfur

Groups A and B in the table below contain molecular

formulas of compounds.

How would the compounds in these groups be

chemically classified?

• group A - inorganic

  group B - organic

• group A - organic

  group B - inorganic

• group A - monosaccharides

  group B - disaccharides

• group A - disaccharides

  group B - monosaccharides

Base your answer to the following question on the diagram below, which represents a chemical reaction that occurs in the human body, and on your knowledge of biology.

Substances X and Y are examples of which kind of molecule?

• simple sugar

• amino acid

• fat

• hormone

What substance could be represented by the letter X in

the diagram below?

• carbohydrates

• ozone

• carbon dioxide

• water

Most of the starch stored in the cells of a potato is

composed of molecules that originally entered these

cells as

• enzymes

• simple sugars

• amino acids

• minerals

Which process is represented by the reactions

illustrated in the diagram below?

• hydrolysis

• dehydration synthesis

• chemical digestion

• absorption

A by-product of dehydration synthesis is

• urea

• water

• carbon dioxide

• mineral salt