Question 1

Rain falling in the northeastern U.S.has a pH between 5.0 and 4.0.Normally,rainwater has a pH of about 5.6.Which of the following statements is not correct?

Accepted Answer

A)   The pH of the rainwater has changed from neutral to acidic.
B)   The pH of the rainwater has become more acidic.
C)   The hydrogen ion (H+)  content of the rainwater has increased.
D)   The proportion of hydroxide ions (OH-)  in the rainwater has declined.
E)   The rainwater with a pH of 4.0 is ten times more acidic than the rainwater with a pH of 5.0.F) A) and B)
G) C) and E)

Question 2

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

Accepted Answer

A)   primary
B)   secondary
C)   tertiary
D)   quaternary
E)   molecularF) A) and E)
G) A) and D)

Question 3

Which type of bond formation is responsible for the properties of water?

Accepted Answer

A)   hydrogen
B)   polar covalent
C)   ionic
D)   nonpolar covalent
E)   None of these bonds play a role in the properties of water.F) All of the above
G) B) and E)

Question 4

Determine what would happen to an individual's proteins if they developed a fever of 103o F for several days.

Accepted Answer

A)   The proteins would denature due to the increase in body temperature and would become unable to function correctly.
B)   The proteins would increase in their ability to perform their functions because of the increase in body temperature.
C)   Nothing would happen to the proteins as a result of the increase in temperature.
D)   The proteins would denature due to the increase in body temperature and would increase in their ability to function correctly.
E)   One protein would alter in shape which would then cause the next protein to alter in shape which would cause a third protein to alter in shape and so forth until all of the proteins were altered in shape.F) A) and B)
G) A) and C)

Question 5

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)   inertF) All of the above
G) B) and E)

Question 6

In water,a weak hydrogen bond occurs between 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.F) C) and E)
G) B) and E)

Question 7

Enzymes are organic compounds classified as

Accepted Answer

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

Question 8

Which statement regarding acids and bases is correct?

Accepted Answer

A)   Acids increase the pH, and bases decrease the pH.
B)   Acids increase the proportion of hydrogen ions (H+) , and bases reduce the proportion of H+.
C)   Acids are harmful, but bases are not harmful.
D)   Acids combine with bases to form buffers.
E)   Acids combine with bases to form sugars.F) A) and C)
G) B) and E)

Question 9

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)   lower the pH.
E)   increase the pH.F) B) and E)
G) None of the above

Question 10

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

Accepted Answer

A)   cholesterol
B)   phospholipid
C)   triglyceride
D)   neutral fat
E)   fatF) A) and B)
G) None of the above

Question 11

Which of the following molecules is inorganic?

Accepted Answer

A)   CH4
B)   CO2
C)   C6H12O6
D)   C12H22O12
E)   C6H6F) None of the above
G) A) and E)

Question 12

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)   molecularF) A) and B)
G) B) and E)

Question 13

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

Accepted Answer

Answers will vary but should include the...

Question 14

The water strider is an insect that skates across the water without sinking.The tips of its feet must be coated with molecules that are

Accepted Answer

A)   ions.
B)   hydrophilic.
C)   hydrophobic.
D)   basic.
E)   acidic.F) A) and B)
G) A) and C)

Question 15

The nucleus of an atom contains

Accepted Answer

A)   neutrons and electrons.
B)   electrons only.
C)   protons, neutrons, and electrons.
D)   protons and neutrons.
E)   neutrons only.F) A) and D)
G) A) and B)

Question 16

Maltose is classified as a

Accepted Answer

A)   nucleic acid.
B)   fatty acid.
C)   protein.
D)   carbohydrate.
E)   lipid.F) A) and B)
G) C) and D)

Question 17

If an element has an atomic number of 15,then

Accepted Answer

A)   the atomic mass must also be 15.
B)   the atom has 15 electrons.
C)   there are 7 electrons in the outermost shell.
D)   the atom has 15 neutrons.
E)   the atom must have only one orbital.F) C) and E)
G) A) and E)

Question 18

The backbone of a nucleic acid strand is composed of

Accepted Answer

A)   glycerol.
B)   "R" groups.
C)   nitrogenous bases.
D)   alternating pentose sugars and phosphate groups.
E)   alternating adenines and thymines.F) A) and D)
G) A) and E)

Question 19

The chemical reactivity of an element is dependent on

Accepted Answer

A)   the number of protons.
B)   the arrangement of neutrons.
C)   the number of electrons in the outermost shell.
D)   the number of protons and neutrons.
E)   the number of electrons in the inner shell.F) All of the above
G) A) and D)

Question 20

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 - ionicF) C) and E)
G) B) and E)

Exam 2: The Molecules of Cells

Which statement regarding acids and bases is correct?

Correct Answer
verified

The chemical reactivity of an element is dependent on

Correct Answer
verified

Which type of bond formation is responsible for the properties of water?

Correct Answer
verified

Rain falling in the northeastern U.S.has a pH between 5.0 and 4.0.Normally,rainwater has a pH of about 5.6.Which of the following statements is not correct?

Correct Answer
verified

The water strider is an insect that skates across the water without sinking.The tips of its feet must be coated with molecules that are

Correct Answer
verified

Buffers

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
Answers will vary but should include the...
View Answer

Enzymes are organic compounds classified as

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

The backbone of a nucleic acid strand is composed of

Correct Answer
verified

Maltose is classified as a

Correct Answer
verified

Determine what would happen to an individual's proteins if they developed a fever of 103^o F for several days.

Correct Answer
verified

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

Correct Answer
verified

The nucleus of an atom contains

Correct Answer
verified

If an element has an atomic number of 15,then

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Which of the following molecules is inorganic?

Correct Answer
verified

Exam 2: The Molecules of Cells

Which statement regarding acids and bases is correct?

Correct AnswerverifiedShow Answer

The chemical reactivity of an element is dependent on

Correct AnswerverifiedShow Answer

Which type of bond formation is responsible for the properties of water?

Correct AnswerverifiedShow Answer

Rain falling in the northeastern U.S.has a pH between 5.0 and 4.0.Normally,rainwater has a pH of about 5.6.Which of the following statements is not correct?

Correct AnswerverifiedShow Answer

The water strider is an insect that skates across the water without sinking.The tips of its feet must be coated with molecules that are

Correct AnswerverifiedShow Answer

Buffers

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedAnswers will vary but should include the...View AnswerShow Answer

Enzymes are organic compounds classified as

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The backbone of a nucleic acid strand is composed of

Correct AnswerverifiedShow Answer

Maltose is classified as a

Correct AnswerverifiedShow Answer

Determine what would happen to an individual's proteins if they developed a fever of 103o F for several days.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The nucleus of an atom contains

Correct AnswerverifiedShow Answer

If an element has an atomic number of 15,then

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following molecules is inorganic?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Answers will vary but should include the...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Determine what would happen to an individual's proteins if they developed a fever of 103^o F for several days.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified