Question 1

What type of bond will connect the amino acids in a protein?

Accepted Answer

A)  peptide 
B)  triple covalent 
C)  polar covalent 
D)  ionic 
E)  double covalent 
A)  peptide 
B)  triple covalent 
C)  polar covalent 
D)  ionic 
E)  double covalent

Question 2

Which of the following sequences correctly lists the bonds in order of strongest to weakest?

Accepted Answer

A)  double covalent - single covalent - ionic - hydrogen 
B)  single covalent - double covalent - ionic - hydrogen 
C)  ionic - double covalent - single covalent - hydrogen 
D)  hydrogen - double covalent - single covalent - ionic 
E)  double covalent - single covalent - hydrogen - ionic 
A)  double covalent - single covalent - ionic - hydrogen 
B)  single covalent - double covalent - ionic - hydrogen 
C)  ionic - double covalent - single covalent - hydrogen 
D)  hydrogen - double covalent - single covalent - ionic 
E)  double covalent - single covalent - hydrogen - ionic

Question 3

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

A)  Hydrogen bonding occurs only between water molecules. 
B)  Hydrogen bonds are difficult to break. 
C)  Hydrogen bonding can occur between different molecules or within the same molecule. 
D)  Hydrogen bonding is only common among small molecules. 
E)  Hydrogen bonding is usually represented by a solid line between atoms. 
A)  Hydrogen bonding occurs only between water molecules. 
B)  Hydrogen bonds are difficult to break. 
C)  Hydrogen bonding can occur between different molecules or within the same molecule. 
D)  Hydrogen bonding is only common among small molecules. 
E)  Hydrogen bonding is usually represented by a solid line between atoms.

Question 4

Hemoglobin is a protein composed of two pairs of polypeptide chains. What is the highest level of protein structure represented by hemoglobin?

Accepted Answer

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

Question 5

Which of the following functional groups is present in amino acids?

Accepted Answer

A)  sulfhydryl 
B)  amino 
C)  carboxyl 
D)  hydroxyl 
E)  All of the answer choices are present in amino acids. 
A)  sulfhydryl 
B)  amino 
C)  carboxyl 
D)  hydroxyl 
E)  All of the answer choices are present in amino acids.

Question 6

Potassium, a metal with one electron in the outermost shell, will react with how many chlorine atoms? (Chlorine is a nonmetal with seven electrons in the outermost shell.)

Accepted Answer

A)  5 
B)  7 
C)  1 
D)  2 
E)  3 
A)  5 
B)  7 
C)  1 
D)  2 
E)  3

Question 7

Hydrolysis of a fat results in

Accepted Answer

A)  glycerol only. 
B)  fatty acids only. 
C)  glucose only. 
D)  two monosaccharides. 
E)  both glycerol and fatty acids. 
A)  glycerol only. 
B)  fatty acids only. 
C)  glucose only. 
D)  two monosaccharides. 
E)  both glycerol and fatty acids.

Question 8

One carbon atom can form covalent bonds with up to ________ other atoms to form an organic molecule.

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  6 
E)  8 
A)  2 
B)  3 
C)  4 
D)  6 
E)  8

Question 9

Which of the following is an example of a compound?

Accepted Answer

A)  O2 
B)  Cl 
C)  H2 
D)  C6H12O6 
E)  Na+ 
A)  O2 
B)  Cl 
C)  H2 
D)  C6H12O6 
E)  Na+

Question 10

Two molecules of glucose combine to form a disaccharide molecule during a(n) ________ reaction.

Accepted Answer

A)  dehydration 
B)  hydrolysis 
C)  hydrogen bond 
D)  ionic bond 
E)  inert 
A)  dehydration 
B)  hydrolysis 
C)  hydrogen bond 
D)  ionic bond 
E)  inert

Question 11

Which of the following types of lipids is the most abundant constituent of cell membranes?

Accepted Answer

A)  cholesterol 
B)  phospholipid 
C)  triglyceride 
D)  neutral fat 
E)  fat 
A)  cholesterol 
B)  phospholipid 
C)  triglyceride 
D)  neutral fat 
E)  fat

Question 12

Glycogen is a

Accepted Answer

A)  monosaccharide used for quick energy. 
B)  protein found in cell membranes. 
C)  polysaccharide used to store glucose/energy. 
D)  fat found in margarine. 
E)  nucleic acid found in the nucleus of a cell. 
A)  monosaccharide used for quick energy. 
B)  protein found in cell membranes. 
C)  polysaccharide used to store glucose/energy. 
D)  fat found in margarine. 
E)  nucleic acid found in the nucleus of a cell.

Question 13

Which functional group(s) is/are associated with a dehydration reaction?

Accepted Answer

A)  OH 
B)  SH 
C)  OH and NH 
D)  SH and OH 
E)  COOH and SH 
A)  OH 
B)  SH 
C)  OH and NH 
D)  SH and OH 
E)  COOH and SH

Question 14

To measure the activity of the human brain during certain thought processes, a short-lived radioactive sugar is injected in the carotid artery and is utilized by those cells that are most active. This shows up on a PET scan and demonstrates the detection of

Accepted Answer

A)  ionic bonds. 
B)  high levels of radiation. 
C)  covalent bonds. 
D)  neutrons. 
E)  isotopes. 
A)  ionic bonds. 
B)  high levels of radiation. 
C)  covalent bonds. 
D)  neutrons. 
E)  isotopes.

Question 15

The molecular structure shown here is

Accepted Answer

A)  a glucose molecule. 
B)  a fatty acid molecule. 
C)  a glycerol molecule. 
D)  a protein molecule. 
E)  an amino acid. 
A)  a glucose molecule. 
B)  a fatty acid molecule. 
C)  a glycerol molecule. 
D)  a protein molecule. 
E)  an amino acid.

Question 16

When an ionic bond forms, electrons are

Accepted Answer

A)  lost from both atoms. 
B)  gained by both atoms. 
C)  shared equally by both atoms. 
D)  totally lost from the paired atoms. 
E)  transferred from one atom to another. 
A)  lost from both atoms. 
B)  gained by both atoms. 
C)  shared equally by both atoms. 
D)  totally lost from the paired atoms. 
E)  transferred from one atom to another.

Question 17

In water, a weak hydrogen bond occurs between a hydrogen in one molecule and

Accepted Answer

A)  an oxygen atom in the same molecule. 
B)  an oxygen atom in a different molecule. 
C)  a hydrogen atom in the same molecule. 
D)  a hydrogen atom in a different molecule. 
E)  either hydrogen and oxygen atoms of different molecules. 
A)  an oxygen atom in the same molecule. 
B)  an oxygen atom in a different molecule. 
C)  a hydrogen atom in the same molecule. 
D)  a hydrogen atom in a different molecule. 
E)  either hydrogen and oxygen atoms of different molecules.

Question 18

Buffers

Accepted Answer

A)  are strong acids or bases. 
B)  keep the pH within normal limits. 
C)  release large amounts of hydrogen ions (H+). 
D)  will only lower the pH. 
E)  will only increase the pH. 
A)  are strong acids or bases. 
B)  keep the pH within normal limits. 
C)  release large amounts of hydrogen ions (H+). 
D)  will only lower the pH. 
E)  will only increase the pH.

Question 19

The proposed cause of CJD and kuru in humans, mad cow disease, and scrapie in sheep is a change in a brain protein. Disease victims appear to have a protein that should normally contain alpha helices but instead they have changed into a protein made of beta pleated sheets. The disease appears to spread when the abnormal protein comes into contact with the normal protein, causing it to become deformed. Which level of protein structure is associated with these diseases?

Accepted Answer

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

Exam 2: The Molecules of Cells

What type of bond will connect the amino acids in a protein?

Which of the following sequences correctly lists the bonds in order of strongest to weakest?

Which of the following statements about hydrogen bonding is correct?

Hemoglobin is a protein composed of two pairs of polypeptide chains. What is the highest level of protein structure represented by hemoglobin?

Which of the following functional groups is present in amino acids?

Potassium, a metal with one electron in the outermost shell, will react with how many chlorine atoms? (Chlorine is a nonmetal with seven electrons in the outermost shell.)

Hydrolysis of a fat results in

One carbon atom can form covalent bonds with up to ________ other atoms to form an organic molecule.

Which of the following is an example of a compound?

Two molecules of glucose combine to form a disaccharide molecule during a(n) ________ reaction.

Which of the following types of lipids is the most abundant constituent of cell membranes?

Glycogen is a

Which functional group(s) is/are associated with a dehydration reaction?

To measure the activity of the human brain during certain thought processes, a short-lived radioactive sugar is injected in the carotid artery and is utilized by those cells that are most active. This shows up on a PET scan and demonstrates the detection of

The molecular structure shown here is

When an ionic bond forms, electrons are

In water, a weak hydrogen bond occurs between a hydrogen in one molecule and

Buffers

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