Question 1

An oil may be converted into a substance that is solid at room temperature by

Accepted Answer

A)  removing water,causing a dehydration synthesis reaction to occur.
B)  adding hydrogens,decreasing the number of double bonds in the molecules.
C)  removing hydrogens,increasing the number of double bonds.
D)  cooling it,so that double bonds form and the fats solidify.

Question 2

Which of the following contains a carboxyl and an amino group?

Accepted Answer

A)  vinegar
B)  fats
C)  sugars
D)  amino acids

Question 3

The development of atherosclerotic disease can result from a diet high in

Accepted Answer

A)  sugars.
B)  saturated fats.
C)  protein.
D)  fiber.

Question 4

A hydroxyl group is

Accepted Answer

A)  characteristic of proteins.
B)  characteristic of alcohols.
C)  basic.
D)  also called a carbonyl group.

Question 5

The storage form of carbohydrates is in animals and in plants.

Accepted Answer

A)  glycogen ...cellulose
B)  glycogen ...starch
C)  starch ...glycogen
D)  cellulose ...glycogen

Question 6

Lactose intolerance is the inability to

Accepted Answer

A)  digest lactose.
B)  produce milk proteins.
C)  digest cellulose.
D)  produce lactose.

Question 7

Which of the following is an amino group?

Accepted Answer

A)  -CO
B)  -OH
C)  -COOH
D)  -NH2

Question 8

A protein containing more than one polypeptide chain exhibits the level of protein structure.

Accepted Answer

A)  quaternary
B)  tertiary
C)  secondary
D)  primary

Question 9

How are genes used by cells to build proteins?

Accepted Answer

A)  The genes in DNA direct the synthesis of an RNA molecule,which is used to build a protein.
B)  The genes in RNA direct the synthesis of a DNA molecule,which is used to build a protein.
C)  The genes in RNA direct the synthesis of proteins directly.
D)  DNA is transcribed into an amino acid sequence.

Question 10

Cellulose differs from starch in that

Accepted Answer

A)  most animals cannot break down cellulose,whereas starch is easily digested.
B)  starch is made of glucose monomers,whereas cellulose is made of fructose monomers.
C)  cellulose is highly branched,whereas starch is unbranched.
D)  glycogen is formed by plants and cellulose by animals.

Question 11

Cows can derive nutrients from cellulose because

Accepted Answer

A)  they chew their food so thoroughly that cellulose fibers are broken down.
B)  their intestinal tract contains cellulose- hydrolyzing microorganisms.
C)  they convert cellulose into starch,which is easily broken down in the intestinal tract.
D)  they produce the enzymes that break down cellulose.

Question 12

Which of the following statements about animal cell lipids is false?

Accepted Answer

A)  Fats are a form of lipid that function to store energy.
B)  Cholesterol is a type of lipid that is a component of cell membranes and steroid hormones.
C)  Many lipids function as enzymes.
D)  Phospholipids are important components of cell membranes.

Question 13

Amino acids can be distinguished from one another by

Accepted Answer

A)  the type of bond between the R group and the rest of the amino acid molecule.
B)  the chemical properties of their R groups.
C)  the number of R groups found on the amino acid molecules.
D)  the chemical properties of their amino and carboxyl groups.

Question 14

What feature of fats makes them hydrophobic?

Accepted Answer

A)  Fats have carboxyl groups.
B)  Fats include one glycerol molecule.
C)  Fats have nonpolar hydrocarbon chains.
D)  Fats have polar fatty acids.

Question 15

Which of the following statements regarding carbon is false?

Accepted Answer

A)  Carbon has the ability to bond with up to six other atoms.
B)  Carbon has the capacity to form single and double bonds.
C)  Carbon has a tendency to form covalent bonds.
D)  Carbon has the ability to bond together to form extensive,branched,or unbranched "carbon skeletons."

Question 16

Peptide bonds

Accepted Answer

A)  are used to form amino acids.
B)  are formed by a hydrolysis reaction.
C)  link amino acids.
D)  form between fatty acids.

Question 17

Sucrose is formed

Accepted Answer

A)  from two glucose molecules.
B)  when glucose and lactose are combined.
C)  when ionic bonds link two monosaccharides.
D)  from two monosaccharides through dehydration synthesis.

Question 18

A phospholipid is composed of

Accepted Answer

A)  one fatty acid molecule linked to one glycerol molecule and two phosphate groups.
B)  one fatty acid molecule linked to three glycerol molecules.
C)  one glycerol molecule linked to three phosphate groups.
D)  one glycerol molecule linked to one phosphate group and two fatty acids.

Question 19

If you were to add olive oil to your food as part of a diet to lower your risk of atherosclerotic disease,you would use olive oil that

Accepted Answer

A)  is hydrogenated.
B)  is modified to be solid at room temperature.
C)  has lard added to it.
D)  is liquid at room temperature.

Question 20

In what part of the world did the mutation for lactose tolerance first appear?

Accepted Answer

A)  Northern Europe
B)  Eastern Asia
C)  South America
D)  North America

Exam 3: The Molecules of Cells

Amino acids can be distinguished from one another by

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What feature of fats makes them hydrophobic?

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How are genes used by cells to build proteins?

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An oil may be converted into a substance that is solid at room temperature by

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The storage form of carbohydrates is in animals and in plants.

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The development of atherosclerotic disease can result from a diet high in

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If you were to add olive oil to your food as part of a diet to lower your risk of atherosclerotic disease,you would use olive oil that

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Peptide bonds

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Which of the following statements about animal cell lipids is false?

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Which of the following statements regarding carbon is false?

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A phospholipid is composed of

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Which of the following contains a carboxyl and an amino group?

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A protein containing more than one polypeptide chain exhibits the level of protein structure.

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A hydroxyl group is

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Cellulose differs from starch in that

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Which of the following is an amino group?

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Sucrose is formed

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Cows can derive nutrients from cellulose because

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In what part of the world did the mutation for lactose tolerance first appear?

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Lactose intolerance is the inability to

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