Question 1

Which type of lipid molecule is characterized by a backbone of four fused rings?

Accepted Answer

A) DNA 
B) phospholipid 
C) triglyceride 
D) steroid 
E) amino acid 
A) DNA 
B) phospholipid 
C) triglyceride 
D) steroid 
E) amino acid D

Question 2

Which of these combinations would be found in a nucleotide?

Accepted Answer

A) base-acid-salt 
B) adenine-thymine-uracil 
C) base-sugar-phosphate 
D) DNA-RNA-nucleus 
E) sugar-protein-fat 
A) base-acid-salt 
B) adenine-thymine-uracil 
C) base-sugar-phosphate 
D) DNA-RNA-nucleus 
E) sugar-protein-fat C

Question 3

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 A

Question 4

The pH of blood is slightly basic.Which of the following would therefore be an expected pH for blood?

Accepted Answer

A) 6.4 
B) 4.6 
C) 4.7 
D) 7.4 
E) 13.8 
A) 6.4 
B) 4.6 
C) 4.7 
D) 7.4 
E) 13.8

Question 5

Which of the following statements about hydrogen bonding is incorrect?

Accepted Answer

A) Hydrogen bonding occurs only between water molecules. 
B) Hydrogen bonds are easily broken. 
C) Hydrogen bonding can occur between different molecules or within the same molecule. 
D) Most hydrogen bonds involve hydrogen and oxygen or nitrogen. 
E) The structure of a large,complex molecule can be influenced by hydrogen bonding. 
A) Hydrogen bonding occurs only between water molecules. 
B) Hydrogen bonds are easily broken. 
C) Hydrogen bonding can occur between different molecules or within the same molecule. 
D) Most hydrogen bonds involve hydrogen and oxygen or nitrogen. 
E) The structure of a large,complex molecule can be influenced by hydrogen bonding.

Question 6

Enzymes are organic compounds classified as

Accepted Answer

A) nucleic acids. 
B) carbohydrates. 
C) lipids. 
D) steroids. 
E) proteins. 
A) nucleic acids. 
B) carbohydrates. 
C) lipids. 
D) steroids. 
E) proteins.

Question 7

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 8

The atomic mass of an element

Accepted Answer

A) is determined by the number of protons and neutrons it contains. 
B) equals the number of protons plus the number of electrons. 
C) equals the number of neutrons. 
D) changes after each reaction. 
E) depends on the number of electrons in the outermost shell. 
A) is determined by the number of protons and neutrons it contains. 
B) equals the number of protons plus the number of electrons. 
C) equals the number of neutrons. 
D) changes after each reaction. 
E) depends on the number of electrons in the outermost shell.

Question 9

Which of the following reactions is most likely to occur if an individual was to ingest a large dose of lemon juice?

Accepted Answer

A) There would be an increase in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward 7.2. 
B) There would be a decrease in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward 7.2 
C) There would be a decrease in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward "7.2" 
D) There would be a decrease in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward 7.8 
A) There would be an increase in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward 7.2. 
B) There would be a decrease in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward 7.2 
C) There would be a decrease in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward "7.2" 
D) There would be a decrease in the amount of carbonic acid within the bloodstream.  If the carbonic acid didn't form, then the pH of the individual's blood could shift toward 7.8

Question 10

Briefly describe the major functions of lipids in the human body.

Accepted Answer

Answers will vary but should include the

Question 11

Which nutrient source is the easiest one for humans to break down and form ATP?

Accepted Answer

A) glucose 
B) protein 
C) cellulose 
D) phospholipids 
E) chitin 
A) glucose 
B) protein 
C) cellulose 
D) phospholipids 
E) chitin

Question 12

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 13

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 14

Hydrogen bonding produces which of the following properties of water?

Accepted Answer

A) Water boils at a lower temperature than expected. 
B) Water is less dense as ice than as liquid water. 
C) Water absorbs heat with a large change in temperature. 
D) Water releases heat with a large change in temperature. 
E) Water can be more dense as ice than as liquid water. 
A) Water boils at a lower temperature than expected. 
B) Water is less dense as ice than as liquid water. 
C) Water absorbs heat with a large change in temperature. 
D) Water releases heat with a large change in temperature. 
E) Water can be more dense as ice than as liquid water.

Question 15

Water is a liquid at room temperature.This is due to

Accepted Answer

A) ionic bonding of the atoms in the water molecule. 
B) covalent bonding in the water molecule. 
C) covalent bonding between water molecules. 
D) hydrogen bonding within the water molecule. 
E) hydrogen bonding between water molecules. 
A) ionic bonding of the atoms in the water molecule. 
B) covalent bonding in the water molecule. 
C) covalent bonding between water molecules. 
D) hydrogen bonding within the water molecule. 
E) hydrogen bonding between water molecules.

Question 16

Polar covalent bonds result from

Accepted Answer

A) unequal sharing of electrons in a covalent bond. 
B) equal sharing of electrons in a covalent bond. 
C) equal sharing of electrons in an ionic bond. 
D) unequal sharing of electrons in an ionic bond. 
E) hydrogen bonding between molecules. 
A) unequal sharing of electrons in a covalent bond. 
B) equal sharing of electrons in a covalent bond. 
C) equal sharing of electrons in an ionic bond. 
D) unequal sharing of electrons in an ionic bond. 
E) hydrogen bonding between molecules.

Question 17

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 18

Which functional groups are associated with a dehydration reaction?

Accepted Answer

A) H and OH 
B) OH and NHH 
C) SH and OH 
D) COOH and SH 
A) H and OH 
B) OH and NHH 
C) SH and OH 
D) COOH and SH

Question 19

Which of the following is not a property of water that results from hydrogen bonding?

Accepted Answer

A) The temperature of water changes very slowly. 
B) Many polar substances dissolve in water. 
C) Water molecules have cohesiveness. 
D) Ice melts at -100 $\degree$C. 
E) Water has a high surface tension. 
A) The temperature of water changes very slowly. 
B) Many polar substances dissolve in water. 
C) Water molecules have cohesiveness. 
D) Ice melts at -100 $\degree$C. 
E) Water has a high surface tension.

Question 20

The _____ structure of a protein consists of the sequence of the amino acids joined together by peptide bonds.

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

Which type of lipid molecule is characterized by a backbone of four fused rings?

Which of these combinations would be found in a nucleotide?

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

The pH of blood is slightly basic.Which of the following would therefore be an expected pH for blood?

Which of the following statements about hydrogen bonding is incorrect?

Enzymes are organic compounds classified as

Glycogen is a

The atomic mass of an element

Which of the following reactions is most likely to occur if an individual was to ingest a large dose of lemon juice?

Briefly describe the major functions of lipids in the human body.

Which nutrient source is the easiest one for humans to break down and form ATP?

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

Buffers

Hydrogen bonding produces which of the following properties of water?

Water is a liquid at room temperature.This is due to

Polar covalent bonds result from

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.)

Which functional groups are associated with a dehydration reaction?

Which of the following is not a property of water that results from hydrogen bonding?

The _____ structure of a protein consists of the sequence of the amino acids joined together by peptide bonds.

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