Question 1

Which of the following scenarios appropriately represents kinetic energy?

Accepted Answer

A)   A student marking an answer on a exam paper
B)   A swinging door propped open
C)   A large truck parked at the top of a steep hill
D)   All of the choices are correct.E) C) and D)
F) None of the above

Question 2

A buffer will

Accepted Answer

A)   enhance changes in the pH of the solutions.
B)   resist drastic changes in the pH of the solutions.
C)   have no effect on the pH of the solutions.
D)   make a solution more acidic.
E)   make a solution more basic.F) A) and E)
G) A) and C)

Question 3

Phospholipids

Accepted Answer

A)   contain subunits called amino acids.
B)   are water-soluble.
C)   are a type of steroid.
D)   are fat-soluble vitamins.
E)   are found in plasma membranes.F) All of the above
G) A) and C)

Question 4

The conversion between different states of energy (e.g. potential energy to kinetic energy)

Accepted Answer

A)   is not 100% efficient.
B)   is 100% efficient.
C)   typically generates heat.
D)   is not possible; energy cannot change its state.
E)   is not 100% efficient and typically generates heat.F) A) and E)
G) B) and C)

Question 5

Oxygen has an atomic number of eight. When two oxygen atoms come together, they form a/an ________ bond.

Accepted Answer

A)   hydrogen
B)   nonpolar covalent
C)   polar covalent
D)   ionic
E)   Van der WaalsF) C) and D)
G) C) and E)

Question 6

To which of the following organic groups does DNA belong?

Accepted Answer

A)   Carbohydrate
B)   Protein
C)   Lipid
D)   Nucleic acid
E)   VitaminF) C) and E)
G) A) and E)

Question 7

The four most abundant elements in the human body are

Accepted Answer

A)   carbon, hydrogen, oxygen, and iron.
B)   carbon, hydrogen, oxygen, and nitrogen.
C)   calcium, hydrogen, sodium, and potassium.
D)   carbon, oxygen, magnesium, and zinc.
E)   carbon, sulfur, calcium, and potassium.F) B) and D)
G) None of the above

Question 8

Which function of proteins is NOT correctly matched with the example?

Accepted Answer

A)   Transport - hemoglobin
B)   Structure - collagen and keratin
C)   Regulation - enzymes and hormones
D)   Protection - packing around organs and glands
E)   Contraction - actin and myosin in musclesF) B) and C)
G) A) and D)

Question 9

Subatomic particles located around the nucleus of an atom are ________.

Accepted Answer

A)   protons
B)   electrons
C)   neutrons
D)   neutrinos
E)   photonsF) A) and B)
G) B) and D)

Question 10

Which of the following is an organic compound?

Accepted Answer

A)   Hydrochloric acid (HCl) 
B)   Salt (NaCl) 
C)   Sucrose (C12H22O11) 
D)   Water (H2O) 
E)   None of the choices are correct.F) B) and C)
G) A) and B)

Question 11

In an oxidation-reduction reaction, ________ are transferred between molecules.

Accepted Answer

A)   electrons
B)   charges
C)   neutrons
D)   protonsE) None of the above
F) All of the above

Question 12

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 C)
G) None of the above

Question 13

Proteins in cells can act as important buffer systems. If intracellular pH rises, certain ________ of proteins can ________ H+ to return pH to normal conditions.

Accepted Answer

A)   amino acids; donate
B)   nucleotides; donate
C)   amino acids; accept
D)   nucleotides; acceptE) None of the above
F) All of the above

Question 14

Hydrogen bonds are important for all of the following except

Accepted Answer

A)   producing surface tension in water.
B)   helping hold a protein structure together.
C)   helping hold DNA strands together.
D)   helping atoms give up or receive electrons.E) B) and C)
F) A) and D)

Question 15

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

Question 16

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

Accepted Answer

A)   Chlorine atoms have 18 electrons.
B)   Chlorine has a mass number of 35.
C)   Chlorine has an atomic number of 18.
D)   Chlorine has 35 electrons.
E)   Chlorine has an atomic number of 35.F) C) and D)
G) None of the above

Question 17

X-rays can be used to view bones because

Accepted Answer

A)   x-rays pass through bone.
B)   x-rays react with bone.
C)   x-rays cannot pass through bone.
D)   bones are less dense than soft tissue.E) B) and C)
F) All of the above

Question 18

A group of water molecules are held together by ________ bonds.

Accepted Answer

A)   savings
B)   hydrogen
C)   ionic
D)   nonpolar covalent
E)   polar covalentF) C) and E)
G) B) and E)

Question 19

Which of the following best describes the effect that holding your breath has on blood pH?

Accepted Answer

A)   Holding your breath increases blood pH by increasing the amount of carbon dioxide in the blood.
B)   Holding your breath decreases blood pH by increasing the amount of carbon dioxide in the blood.
C)   Holding your breath increases blood pH by decreasing the amount of carbon dioxide in the blood.
D)   Holding your breath decreases blood pH by decreasing the amount of carbon dioxide in the blood.E) None of the above
F) C) and D)

Question 20

If the products of a chemical reaction contain less potential energy than the reactants,

Accepted Answer

A)   energy has been stored in the molecular bonds of the product.
B)   energy has been released by the breaking of molecular bonds.
C)   the reaction will be reversible without additional energy input.
D)   a synthesis reaction is likely to have occurred.
E)   All of the choices are correct.F) None of the above
G) A) and B)

Exam 2: The Chemical Basis of Life

Hydrogen bonds are important for all of the following except

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X-rays can be used to view bones because

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Which of the following best describes the effect that holding your breath has on blood pH?

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Phospholipids

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Which of the following scenarios appropriately represents kinetic energy?

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Kinetic energy is

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The four most abundant elements in the human body are

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Proteins in cells can act as important buffer systems. If intracellular pH rises, certain ________ of proteins can ________ H+ to return pH to normal conditions.

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A group of water molecules are held together by ________ bonds.

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The conversion between different states of energy (e.g. potential energy to kinetic energy)

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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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In an oxidation-reduction reaction, ________ are transferred between molecules.

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A buffer will

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Which of the following is an organic compound?

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Subatomic particles located around the nucleus of an atom are ________.

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If the products of a chemical reaction contain less potential energy than the reactants,

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Oxygen has an atomic number of eight. When two oxygen atoms come together, they form a/an ________ bond.

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Which function of proteins is NOT correctly matched with the example?

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To which of the following organic groups does DNA belong?

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Cations and anions that dissociate in water are sometimes called

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Proteins in cells can act as important buffer systems. If intracellular pH rises, certain of proteins can H⁺ to return pH to normal conditions.

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