Question 1

A substance composed of two or more different types of atoms is a(n)

Accepted Answer

A)  element.
B)  compound and a molecule.
C)  compound.
D)  molecule.
E)  ion.F) D) and E)
G) C) and E)

Question 2

Glycogen is the

Accepted Answer

A)  storage carbohydrate in animals.
B)  storage carbohydrate in plants.
C)  sugar found in RNA.
D)  major nutrient for most body cells.
E)  nondigestible plant polysaccharide.F) A) and E)
G) A) and B)

Question 3

X-rays can be used to view bones because

Accepted Answer

A)  x-rays can not pass through bone.
B)  x-rays pass through bone.
C)  x-rays react with bone.
D)  bones are less dense than soft tissue.E) All of the above
F) None of the above

Question 4

Which of the following best describes a proton?

Accepted Answer

A)  one negative charge,no mass,found in orbitals
B)  no charge,mass of one,found in nucleus
C)  one positive charge,mass of one,found in nucleus
D)  subatomic particle with no electric charge
E)  None of these choices is correct.F) C) and D)
G) A) and E)

Question 5

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

A)  testosterone
B)  progesterone
C)  bile salts
D)  estrogen
E)  prostaglandinsF) C) and D)
G) D) and E)

Question 6

The molecular formula H2O means

Accepted Answer

A)  1 hydrogen atom and 2 oxygen atoms.
B)  1 hydrogen atom and 1 oxygen atom.
C)  2 hydrogen atoms and 1 oxygen atom.
D)  2 hydrogen atoms and 2 oxygen atoms.
E)  None of these choices is correct.F) None of the above
G) B) and D)

Question 7

The model that helps explain how an enzyme works is the

Accepted Answer

A)  three-dimensional model.
B)  denaturation model.
C)  activation model.
D)  lock-and-key model.E) A) and B)
F) A) and C)

Question 8

An atom of chlorine has 17 protons and 18 neutrons.Which of the following statements is true?

Accepted Answer

A)  Chlorine has an atomic number of 18.
B)  Chlorine atoms have 18 electrons.
C)  Chlorine has an atomic number of 35.
D)  Chlorine has 35 electrons.
E)  Chlorine has a mass number of 35.F) A) and B)
G) A) and C)

Question 9

In an x-ray film of the skeletal system,the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.

Accepted Answer

A)   light,absorb; dark,do not absorb
B)   dark,absorb; light,do not absorb
C)   dark,do not absorb; light,do absorb
D)   light,do not absorb; dark,aborbE) C) and D)
F) B) and D)

Question 10

A cation is

Accepted Answer

A)  a molecule that conducts electricity when placed in solution.
B)  an alteration in the three-dimensional structure of a protein.
C)  a positively charged ion.
D)  a combination of atoms held together by chemical bonds.
E)  a negatively charged ion.F) B) and E)
G) A) and E)

Question 11

ATP

Accepted Answer

A)  serves as the energy currency of the cell.
B)  can store,but cannot release energy in the cell.
C)  is a sugar found in transfer RNA.
D)  stores genetic information.
E)  is a nucleotide found in DNA.F) C) and E)
G) B) and E)

Question 12

Which of the following statements is false?

Accepted Answer

A)  Water transports nutrients in the body.
B)  Water evaporation heats the body.
C)  Water evaporation cools the body.
D)  Water serves as an effective lubricant in our bodies.
E)  Water allows the body to resist sudden temperature changes.F) B) and D)
G) A) and D)

Question 13

Normal pH for blood is 7.35 to 7.45.Maintenance of the pH in this range is

Accepted Answer

A)  critical because enzymes work best within narrow ranges of pH.
B)  not critical because extreme pH values do not affect enzyme function.
C)  called denaturation.
D)  not required.
E)  None of these choices is correct.F) D) and E)
G) B) and C)

Question 14

The primary structure of a protein is

Accepted Answer

A)  the hydrogen bonds between amino acids.
B)  the folded,helical nature of the molecule.
C)  represented by multiple polypeptide chains.
D)  the sequence of amino acids in the polypeptide chain.
E)  the number of polypeptide chains in the molecule.F) A) and D)
G) A) and C)

Question 15

Normal pH range for blood is 7.35 to 7.45.If blood pH falls below 7.35,

Accepted Answer

A)  the number of red blood cells decreases.
B)  the blood becomes saltier.
C)  an imbalance called acidosis results.
D)  an imbalance called alkalosis results.
E)  nothing happens as this is an acceptable deviation.F) C) and D)
G) B) and C)

Question 16

The molecule used most frequently by cells as a fuel belongs to which of the following groups?

Accepted Answer

A)  carbohydrates
B)  nucleic acids
C)  prostaglandins
D)  phospholipids
E)  steroidsF) A) and B)
G) B) and D)

Question 17

Which of the following organic groups does an enzyme belong to?

Accepted Answer

A)  nucleic acid
B)  lipid
C)  vitamin
D)  carbohydrate
E)  proteinF) C) and D)
G) A) and D)

Question 18

Which of the following organic groups does a steroid belong to?

Accepted Answer

A)  carbohydrate
B)  nucleic acid
C)  protein
D)  lipid
E)  vitaminF) B) and E)
G) C) and D)

Question 19

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male.What kind of molecule is found at "E"?

Accepted Answer

A)  water molecule
B)  polar covalent bond
C)  hydrogen atom
D)  oxygen atom
E)  hydrogen bondF) A) and B)
G) A) and C)

Question 20

Which of the following chemical reactions best represents the decomposition of ATP?

Accepted Answer

A)  ATP + ADP  →\rightarrow→  ATP
B)  ATP + energy  →\rightarrow→  ADP + H2O
C)  ATP + H2O  →\rightarrow→  ADP + Pi + energy
D)  ADP + ADP + ADP  →\rightarrow→  ATP
E)  ADP + Pi + energy  →\rightarrow→  ATP + H2O F) A) and B)
G) C) and E)

Exam 2: The Chemical Basis of Life

Which of the following molecules is NOT made from cholesterol?

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Which of the following best describes a proton?

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Normal pH range for blood is 7.35 to 7.45.If blood pH falls below 7.35,

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-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male.What kind of molecule is found at "E"?

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ATP

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An atom of chlorine has 17 protons and 18 neutrons.Which of the following statements is true?

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The molecule used most frequently by cells as a fuel belongs to which of the following groups?

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Normal pH for blood is 7.35 to 7.45.Maintenance of the pH in this range is

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Glycogen is the

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The primary structure of a protein is

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Which of the following organic groups does a steroid belong to?

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The molecular formula H2O means

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Which of the following chemical reactions best represents the decomposition of ATP?

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The model that helps explain how an enzyme works is the

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A cation is

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A substance composed of two or more different types of atoms is a(n)

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Which of the following organic groups does an enzyme belong to?

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Which of the following statements is false?

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X-rays can be used to view bones because

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In an x-ray film of the skeletal system,the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.

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The molecular formula H₂O means

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In an x-ray film of the skeletal system,the dense tissue areas appear because they the x-rays; and the less dense tissues appear because they the x-rays.

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