Question 1

In an atom, the number of protons always equals the number of

Accepted Answer

A)   electrons.
B)   neutrons.
C)   neutrons and protons.
D)   quarks.
E)   neutrinos.F) All of the above
G) C) and D)

Question 2

Atoms that share electrons have what type of bonds?

Accepted Answer

A)   covalent
B)   neutral
C)   hydrogen
D)   colloidal
E)   ionicF) None of the above
G) D) and E)

Question 3

Sugars with three to seven carbon atoms are called

Accepted Answer

A)   monosaccharides.
B)   disaccharides.
C)   trisaccharides.
D)   polysaccharides.
E)   steroids.F) B) and C)
G) A) and B)

Question 4

All amino acids are alike in that their R groups are polar.

Accepted Answer

A) True 
 B)False

Question 5

A species has 29% of its DNA composed of the nucleotide containing guanine G) . What percent does the nitrogen base thymine T)  equal?

Accepted Answer

A)   58%
B)   42%
C)   21%
D)   67%
E)   29%F) A) and D)
G) B) and D)

Question 6

The primary level of protein structure is composed of amino acids in a linear sequence joined by peptide bonds.

Accepted Answer

A) True 
 B)False

Question 7

In an acidic solution, the number of H+ is

Accepted Answer

A)   less than the number of OH-.
B)   greater than the number of OH-.
C)   equal to the number of OH-.
D)   3 times less than the number of OH-.
E)   10 times less than the number of OH-.F) B) and C)
G) A) and B)

Question 8

ATP carries energy in the form of high-energy

Accepted Answer

A)   carbohydrate bonds.
B)   peptide bonds.
C)   lipid bonds.
D)   phosphate bonds.
E)   hydrogen bonds.F) B) and E)
G) B) and D)

Question 9

Carbon dating is a common method employed in dating certain kinds of fossils. It is based on the radioactive decay of an isotope of carbon C14) . Referring to the atomic number of carbon attained from the periodic table, how many neutrons does C14 have?

Accepted Answer

A)   2
B)   4
C)   8
D)   12
E)   14F) None of the above
G) A) and D)

Question 10

What substance is used in medicine to produce various images of organs and tissues?

Accepted Answer

A)   a mixture
B)   a tracer
C)   an emulsion
D)   a colloid
E)   a sensorF) A) and E)
G) None of the above

Question 11

How are fats, phospholipids, and steroids alike?

Accepted Answer

A)   They are all solid at room temperature.
B)   They each contain a polar phosphate group.
C)   They each contain only one fatty acid.
D)   They do not dissolve in water.
E)   They all contain at least one carbon ring.F) A) and B)
G) A) and E)

Question 12

Which level of protein structure is characterized by alpha and beta sheets in which hydrogen bonding holds the shape in place?

Accepted Answer

A)   secondary structure
B)   primary structure
C)   tertiary structure
D)   quaternary structure
E)   pentagonal structureF) D) and E)
G) C) and D)

Question 13

Which polysaccharide is branched the most?

Accepted Answer

A)   cellulose
B)   starch
C)   glycogen
D)   glucose
E)   fructoseF) None of the above
G) All of the above

Question 14

Radiation can have both positive and negative impact on humans.

Accepted Answer

A) True 
 B)False

Question 15

Which polysacccharide is stored as an energy source in the body of animals?

Accepted Answer

A)   glycogen
B)   glucose
C)   cellulose
D)   starch
E)   chitinF) A) and D)
G) None of the above

Question 16

ATP is called the energy currency of the body because it is a type of electricity.

Accepted Answer

A) True 
 B)False

Question 17

When an ATP molecule is used to supply energy, which of the following occurs?

Accepted Answer

A)   a phosphate bond is added
B)   a phosphate bond is broken
C)   oxygen is removed
D)   oxygen is added
E)   an adenine is addedF) A) and E)
G) C) and E)

Question 18

Which of the following characteristics of water is most responsible for the sinking of the Titanic?

Accepted Answer

A)   Water is liquid at room temperature.
B)   Water has a high heat of vaporization.
C)   The temperature of liquid water rises and falls slowly.
D)   Frozen water is less dense than liquid water.
E)   Water molecules are cohesive.F) D) and E)
G) A) and C)

Question 19

Which of the following is not present in a nucleotide?

Accepted Answer

A)   phosphate
B)   nitrogenous base
C)   five-ring sugar
D)   an R group
E)   a pentoseF) All of the above
G) C) and E)

Question 20

The presence of a buffer in our blood helps maintain homeostasis.

Accepted Answer

A) True 
 B)False

Exam 2: Chemistery of Life

In an acidic solution, the number of H+ is

Correct AnswerverifiedShow Answer

A species has 29% of its DNA composed of the nucleotide containing guanine G) . What percent does the nitrogen base thymine T) equal?

Correct AnswerverifiedShow Answer

When an ATP molecule is used to supply energy, which of the following occurs?

Correct AnswerverifiedShow Answer

In an atom, the number of protons always equals the number of

Correct AnswerverifiedShow Answer

Radiation can have both positive and negative impact on humans.

Correct AnswerverifiedShow Answer

ATP carries energy in the form of high-energy

Correct AnswerverifiedShow Answer

Which of the following characteristics of water is most responsible for the sinking of the Titanic?

Correct AnswerverifiedShow Answer

ATP is called the energy currency of the body because it is a type of electricity.

Correct AnswerverifiedShow Answer

Atoms that share electrons have what type of bonds?

Correct AnswerverifiedShow Answer

The primary level of protein structure is composed of amino acids in a linear sequence joined by peptide bonds.

Correct AnswerverifiedShow Answer

Which polysacccharide is stored as an energy source in the body of animals?

Correct AnswerverifiedShow Answer

Which polysaccharide is branched the most?

Correct AnswerverifiedShow Answer

Which of the following is not present in a nucleotide?

Correct AnswerverifiedShow Answer

All amino acids are alike in that their R groups are polar.

Correct AnswerverifiedShow Answer

Carbon dating is a common method employed in dating certain kinds of fossils. It is based on the radioactive decay of an isotope of carbon C14) . Referring to the atomic number of carbon attained from the periodic table, how many neutrons does C14 have?

Correct AnswerverifiedShow Answer

How are fats, phospholipids, and steroids alike?

Correct AnswerverifiedShow Answer

What substance is used in medicine to produce various images of organs and tissues?

Correct AnswerverifiedShow Answer

Which level of protein structure is characterized by alpha and beta sheets in which hydrogen bonding holds the shape in place?

Correct AnswerverifiedShow Answer

Sugars with three to seven carbon atoms are called

Correct AnswerverifiedShow Answer

The presence of a buffer in our blood helps maintain homeostasis.

Correct AnswerverifiedShow Answer

In an acidic solution, the number of H⁺ is

Correct Answer
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Carbon dating is a common method employed in dating certain kinds of fossils. It is based on the radioactive decay of an isotope of carbon C¹⁴) . Referring to the atomic number of carbon attained from the periodic table, how many neutrons does C¹⁴ have?

Correct Answer
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