Question 1

The chemical behavior of an atom is determined by

Accepted Answer

A)   the number of protons.
B)   the number of neutrons.
C)   the outermost electron shell.
D)   the size of the atom.
E)   the mass of the nucleus.F) None of the above
G) A) and D)

Question 2

An important buffer in body fluids is

Accepted Answer

A)   NaCl.
B)   NaOH.
C)   HCl.
D)   NaHCO₃.
E)   H₂O.F) B) and E)
G) A) and C)

Question 3

Chemical reactions that yield energy, such as heat, are said to be

Accepted Answer

A)   endergonic.
B)   activated.
C)   exergonic.
D)   neutral.
E)   thermonuclear.F) All of the above
G) A) and D)

Question 4

The center of an atom is called the ________.

Accepted Answer

The answer of The center of an atom is called...

Question 5

In dehydration reactions, compounds

Accepted Answer

A)   lose water molecules.
B)   gain water molecules.
C)   convert water molecules to hydrogen and oxygen.
D)   convert hydrogen and oxygen to water.
E)   gain electrons.F) B) and C)
G) A) and E)

Question 6

Explain the role of water molecules in polysaccharide formation.

Accepted Answer

Water molecules are ...

Question 7

The molecule H₂ is known as

Accepted Answer

A)   hydrohydrogen.
B)   hydrogen.
C)   hydroxide.
D)   helium.
E)   semi-water.F) A) and B)
G) C) and D)

Question 8

Lipids

Accepted Answer

A)   form essential structural components of cells.
B)   provide roughly twice the energy as carbohydrates.
C)   help to maintain body temperature.
D)   cushion organs against shocks.
E)   all of the aboveF) B) and D)
G) B) and C)

Question 9

A lipid made of a glycerol molecule with two fatty acids attached to one side and a phosphate group connecting a nonlipid group attached to the other

Accepted Answer

A)   cholesterol.
B)   phospholipids.
C)   triglycerides.
D)   prostaglandins.
E)   monoglycerides.F) A) and B)
G) A) and E)

Question 10

Fructose

Accepted Answer

A)   is a hexose.
B)   is an isomer of glucose.
C)   is found in fruits.
D)   all of the above
E)   none of the aboveF) All of the above
G) A) and D)

Question 11

Which of the following substances would be most acidic?

Accepted Answer

A)   lemon juice, pH = 2
B)   urine, pH = 6
C)   tomato juice, pH = 4
D)   white wine, pH = 3
E)   stomach secretions, pH = 1F) B) and C)
G) A) and E)

Question 12

The mass of an atom is largely determined by the number of ________ it has.

Accepted Answer

A)   electrons
B)   protons
C)   neutrons
D)   protons + neutrons
E)   protons + electronsF) A) and D)
G) A) and E)

Question 13

A(n) ________ is a pure substance composed of atoms.

Accepted Answer

The answer of A(n) ________ is a pure substance composed...

Question 14

Interaction between individual polypeptide chains to form a protein complex is ________ structure.

Accepted Answer

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

Question 15

All of the following are True concerning enzymes, except that they

Accepted Answer

A)   are proteins.
B)   function as biological catalysts.
C)   lower the activation energy required for a reaction.
D)   affect only the rate of a chemical reaction.
E)   are consumed during the reaction.F) B) and D)
G) B) and E)

Question 16

Hydrophilic molecules readily associate with

Accepted Answer

A)   lipid molecules.
B)   hydrophobic molecules.
C)   water molecules.
D)   both lipid molecules and hydrophobic molecules.
E)   cholesterol.F) A) and E)
G) B) and E)

Question 17

Ionic bonds are formed when

Accepted Answer

A)   atoms share electrons.
B)   electrons are completely transferred from one atom to another.
C)   a pair of electrons is shared unequally by two atoms.
D)   hydrogen forms bonds with negatively charged atoms.
E)   two or more atoms lose electrons at the same time.F) B) and E)
G) B) and D)

Question 18

Lipids that are produced by nearly every tissue in the body and that act as local regulators of cell activities are the

Accepted Answer

A)   prostaglandins.
B)   steroids.
C)   monoglycerides.
D)   phospholipids.
E)   glycolipids.F) B) and D)
G) B) and C)

Question 19

Which of the following statements about hydrogen bonds is False ?

Accepted Answer

A)   Hydrogen bonds are strong attractive forces between hydrogen atoms and negatively charged atoms.
B)   Hydrogen bonds can occur within a single molecule.
C)   Hydrogen bonds can form between neighboring molecules.
D)   Hydrogen bonds are important for holding large molecules together.
E)   Hydrogen bonds are responsible for many of the properties of water.F) A) and E)
G) A) and D)

Question 20

Adding a phosphate group to adenosine forms

Accepted Answer

A)   ADP.
B)   ATP.
C)   AMP.
D)   2ATP.
E)   ribose.F) A) and D)
G) None of the above

Exam 2: Chemical Level of Organization

Explain the role of water molecules in polysaccharide formation.

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An important buffer in body fluids is

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Which of the following substances would be most acidic?

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The molecule H₂ is known as

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Which of the following statements about hydrogen bonds is False ?

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Interaction between individual polypeptide chains to form a protein complex is ________ structure.

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Chemical reactions that yield energy, such as heat, are said to be

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The mass of an atom is largely determined by the number of ________ it has.

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Hydrophilic molecules readily associate with

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All of the following are True concerning enzymes, except that they

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Adding a phosphate group to adenosine forms

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Ionic bonds are formed when

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The center of an atom is called the ________.

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Lipids that are produced by nearly every tissue in the body and that act as local regulators of cell activities are the

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In dehydration reactions, compounds

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A(n) ________ is a pure substance composed of atoms.

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Fructose

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The chemical behavior of an atom is determined by

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Lipids

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A lipid made of a glycerol molecule with two fatty acids attached to one side and a phosphate group connecting a nonlipid group attached to the other

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Water molecules are ...
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