Question 1

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) A) and E)
G) B) and C)

Question 2

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) A) and B)
G) C) and D)

Question 3

Deoxyribose is a sugar found in

Accepted Answer

A)   glycogen.
B)   starch.
C)   DNA.
D)   RNA.
E)   ATP.F) A) and C)
G) B) and E)

Question 4

The hydrogen and oxygen atoms in a molecule of water are held together by

Accepted Answer

A)   ionic bonds.
B)   peptide bonds.
C)   savings bonds.
D)   polar covalent bonds.
E)   nonpolar bonds.F) B) and E)
G) A) and D)

Question 5

Which of the following is a carbohydrate?

Accepted Answer

A)   triglyceride
B)   hemoglobin
C)   cholesterol
D)   animal fat
E)   sucroseF) All of the above
G) A) and D)

Question 6

Glucose is the

Accepted Answer

A)   storage carbohydrate in animals.
B)   storage carbohydrate in plants.
C)   nondigestible plant polysaccharide.
D)   major nutrient for most body cells.
E)   sugar found in RNA.F) B) and E)
G) None of the above

Question 7

A neutral atom contains

Accepted Answer

A)   more protons than electrons.
B)   more electrons than protons.
C)   the same number of electrons and protons.
D)   only neutrons.
E)   None of these choices is correct.F) C) and D)
G) A) and E)

Question 8

Which of the following lists includes only monosaccharides that are isomers of one another?

Accepted Answer

A)   glycogen, glucose, sucrose
B)   starch, glycogen, cellulose
C)   glucose, fructose, galactose
D)   ribose, glycogen, glucose
E)   deoxyribose, glycogen, starchF) C) and E)
G) B) and D)

Question 9

Which of the following is a component of a nucleotide?

Accepted Answer

A)   adenine--a nitrogen base
B)   glucose--a monosaccharide
C)   cholesterol--a steroid
D)   calcium ions
E)   ATPF) A) and B)
G) A) and C)

Question 10

What molecule is produced as a waste product of the metabolism of glucose by cells?

Accepted Answer

A)   water
B)   oxygen
C)   carbon dioxide
D)   carbon monoxide
E)   nitrogenF) B) and E)
G) D) and E)

Question 11

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

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

What type of covalent bond is formed between amino acid molecules during protein synthesis?

Accepted Answer

A)   amino bond
B)   peptide bond
C)   primary bond
D)   hydrogen bond
E)   electrovalent bondF) A) and C)
G) B) and C)

Question 14

Cations and anions that dissociate in water are sometimes called

Accepted Answer

A)   nonelectrolytes, because they do not conduct an electrical current.
B)   molecules
C)   electrolytes, because they can conduct an electrical current.
D)   nonelectrolytes and solutes.
E)   molecules and electrolytes.F) A) and B)
G) B) and C)

Question 15

The smallest particle of an element that still exhibits the chemical characteristics of that element is a(n)

Accepted Answer

A)   electron.
B)   atom.
C)   chemical bond.
D)   orbital.
E)   proton.F) All of the above
G) A) and D)

Question 16

Which of the following organic groups does lactose belong to?

Accepted Answer

A)   carbohydrate
B)   protein
C)   lipid
D)   nucleic acid
E)   vitaminF) None of the above
G) C) and E)

Question 17

Lipids

Accepted Answer

A)   are subunits of carbohydrates.
B)   serve as buffers.
C)   are an important component of cell membranes.
D)   tend to be water soluble.
E)   are polarized.F) B) and C)
G) A) and E)

Question 18

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

Accepted Answer

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

Question 19

Kinetic energy is

Accepted Answer

A)   the form of energy that actually does work.
B)   movement of ions or electrons.
C)   energy that flows between objects with different temperatures.
D)   stored energy that could do work but is not doing so.
E)   energy that moves in waves.F) A) and E)
G) A) and D)

Question 20

Which of the following is determined by sequence of amino acids bound by peptide bonds?

Accepted Answer

A)   amino acid
B)   peptide bond
C)   primary structure of protein
D)   secondary structure of protein
E)   denaturationF) B) and D)
G) B) and C)

Exam 2: The Chemical Basis of Life

A neutral atom contains

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Lipids

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What type of covalent bond is formed between amino acid molecules during protein synthesis?

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Which of the following best describes a proton?

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Which of the following organic groups does lactose belong to?

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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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What molecule is produced as a waste product of the metabolism of glucose by cells?

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Glucose is the

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The smallest particle of an element that still exhibits the chemical characteristics of that element is a(n)

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The molecular formula H2O means

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

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Which of the following is determined by sequence of amino acids bound by peptide bonds?

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Kinetic energy is

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Which of the following lists includes only monosaccharides that are isomers of one another?

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Which of the following is a carbohydrate?

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The hydrogen and oxygen atoms in a molecule of water are held together by

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Deoxyribose is a sugar found in

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Cations and anions that dissociate in water are sometimes called

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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 is a component of a nucleotide?

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The molecular formula H₂O means

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