Question 1

When two amino acids combine via a dehydration reaction,

Accepted Answer

A)   a peptide bond is formed.
B)   the R groups are lost.
C)   water is added to begin the reaction.
D)   the carboxyl group of each join together.
E)   the amino group of each join together.F) A) and B)
G) B) and E) A

Question 2

The atomic number of an atom is determined by the number of

Accepted Answer

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

Question 3

After lunch, our digestive system will use the process of hydrolysis to break the food down into smaller subunits.

Accepted Answer

A) True 
 B)False

Question 4

How many elements occur naturally?

Accepted Answer

A)   112
B)   92
C)   64
D)   32
E)   6F) A) and B)
G) C) and E) B

Question 5

The reason water is polar is because

Accepted Answer

A)   in polar molecules atoms share electrons evenly.
B)   the electrons spend more time circling the oxygen atom than the hydrogens.
C)   hydrophilic molecules interact with water.
D)   hydrophobic molecules do not interact with water.
E)   there is a transfer of electrons from the hydrogen to the oxygen.F) A) and E)
G) C) and D)

Question 6

CaCl2 is a salt that forms as the result of what type of bond?

Accepted Answer

A)   covalent
B)   hydrogen
C)   polar
D)   nonpolar
E)   ionicF) A) and D)
G) C) and D)

Question 7

The smallest unit of an element that still retains the chemical and physical properties of that element is called an)

Accepted Answer

A)   isotope.
B)   nucleus.
C)   atom.
D)   molecular bond.
E)   neutrino.F) D) and E)
G) C) and D)

Question 8

Which grouping of elements is found in carbohydrates?

Accepted Answer

A)   C - H - O
B)   C - H - P
C)   H - O - Cl
D)   N - S - O
E)   Ca - H - OF) A) and D)
G) C) and D)

Question 9

The membranes of cells are composed primarily of

Accepted Answer

A)   phospholipids.
B)   fats.
C)   oils.
D)   steroids.
E)   triglycerides.F) A) and D)
G) A) and B)

Question 10

A solution containing 0.00001 moles of H+ has a pH of

Accepted Answer

A)   3.
B)   5.
C)   7.
D)   9.
E)   11.F) A) and B)
G) C) and D)

Question 11

Which of the following foods would be a good source of fiber?

Accepted Answer

A)   peaches
B)   whole-wheat bread
C)   peanuts
D)   bran cereal
E)   All of these are good sources of fiber.F) A) and B)
G) A) and C)

Question 12

What is the symbol for sodium?

Accepted Answer

A)   Na
B)   S
C)   So
D)   N
E)   DmF) None of the above
G) A) and B)

Question 13

Which of the following nitrogenous bases is not found in DNA?

Accepted Answer

A)   cytosine
B)   thymine
C)   uracil
D)   guanine
E)   adenineF) D) and E)
G) All of the above

Question 14

A fatty acid that contains only single bonds between the carbon atoms is considered

Accepted Answer

A)   saturated.
B)   unsaturated.
C)   trans unsaturated.
D)   a cholestrol.
E)   a steroid.F) A) and B)
G) C) and D)

Question 15

Which of the following is not one of the four classes of organic molecules found in cells?

Accepted Answer

A)   vitamins
B)   lipids
C)   proteins
D)   carbohydrates
E)   nucleic acidsF) A) and B)
G) B) and D)

Question 16

An element cannot be broken down by chemical means.

Accepted Answer

A) True 
 B)False

Question 17

NaCl is not an organic molecule.

Accepted Answer

A) True 
 B)False

Question 18

A fat contains how many fatty acids?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) B) and C)
G) A) and E)

Question 19

List the properties of water.

Accepted Answer

1. Water has a high heat capac...

Question 20

A potato stores a reserve of energy in its underground tuber in the form of

Accepted Answer

A)   glycogen.
B)   fat.
C)   protein.
D)   vitamins.
E)   starch.F) A) and D)
G) B) and E) E

Exam 2: Chemistery of Life

When two amino acids combine via a dehydration reaction,

Correct AnswerverifiedA

The atomic number of an atom is determined by the number of

Correct AnswerverifiedShow Answer

After lunch, our digestive system will use the process of hydrolysis to break the food down into smaller subunits.

Correct AnswerverifiedShow Answer

How many elements occur naturally?

Correct AnswerverifiedB

The reason water is polar is because

Correct AnswerverifiedShow Answer

CaCl2 is a salt that forms as the result of what type of bond?

Correct AnswerverifiedShow Answer

The smallest unit of an element that still retains the chemical and physical properties of that element is called an)

Correct AnswerverifiedShow Answer

Which grouping of elements is found in carbohydrates?

Correct AnswerverifiedShow Answer

The membranes of cells are composed primarily of

Correct AnswerverifiedShow Answer

A solution containing 0.00001 moles of H+ has a pH of

Correct AnswerverifiedShow Answer

Which of the following foods would be a good source of fiber?

Correct AnswerverifiedShow Answer

What is the symbol for sodium?

Correct AnswerverifiedShow Answer

Which of the following nitrogenous bases is not found in DNA?

Correct AnswerverifiedShow Answer

A fatty acid that contains only single bonds between the carbon atoms is considered

Correct AnswerverifiedShow Answer

Which of the following is not one of the four classes of organic molecules found in cells?

Correct AnswerverifiedShow Answer

An element cannot be broken down by chemical means.

Correct AnswerverifiedShow Answer

NaCl is not an organic molecule.

Correct AnswerverifiedShow Answer

A fat contains how many fatty acids?

Correct AnswerverifiedShow Answer

List the properties of water.

Correct Answerverified1. Water has a high heat capac...View AnswerShow Answer

A potato stores a reserve of energy in its underground tuber in the form of

Correct AnswerverifiedE

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A

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B

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CaCl₂ is a salt that forms as the result of what type of bond?

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A solution containing 0.00001 moles of H⁺ has a pH of

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1. Water has a high heat capac...
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