Question 1

A group of water molecules are held together by

Accepted Answer

A)   salt.
B)   hydrogen bonds.
C)   ionic bonds.
D)   double covalent bonds.
E)   polar covalent bonds.F) A) and B)
G) C) and E)

Question 2

The newly discovered element "zinferon" has a mass number of 425 and contains 125 protons. How many neutrons does an atom of this element contain?

Accepted Answer

The answer of The newly discovered element "zinferon" has a...

Question 3

The element uranium has a mass number of 238 and contains 92 protons. What is the atomic number of uranium?

Accepted Answer

The answer of The element uranium has a mass number...

Question 4

Adjacent amino acids in a polypeptide chain are held together by

Accepted Answer

A)   hydrogen bonds.
B)   ionic bonds.
C)   Van der Waals bonds.
D)   peptide bonds.
E)   high energy bonds.F) B) and E)
G) A) and D)

Question 5

Which of the following organic groups does an enzyme belong to?

Accepted Answer

A)   carbohydrate
B)   protein
C)   lipid
D)   nucleic acid
E)   vitaminF) A) and C)
G) B) and D)

Question 6

Isotopes of the same element have

Accepted Answer

A)   the same number of neutrons but different numbers of protons.
B)   different numbers of protons and electrons.
C)   the same mass number.
D)   the same atomic number but differ in their mass numbers.
E)   no mass number.F) B) and D)
G) A) and B)

Question 7

An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably

Accepted Answer

A)   carbon dioxide.
B)   an amino acid.
C)   a triglyceride (fat) .
D)   a monosaccharide.
E)   a phospholipid.F) A) and B)
G) A) and C)

Question 8

Arrange the following from largest to smallest: (1)  nucleus
(2)  DNA molecule
(3)  skin cell
(4)  chicken eggs

Accepted Answer

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

Question 9

If the potential energy in the chemical bonds of the reactants is greater than the potential energy in the chemical bonds of the product,

Accepted Answer

A)   energy must be supplied for the reaction to occur.
B)   energy is released by the reaction.
C)   the chemical reaction equalizes the potential energy levels.
D)   energy has not been gained or lost.
E)   energy is not a factor in the reaction.F) A) and B)
G) All of the above

Question 10

Eicosanoids

Accepted Answer

A)   are structural proteins.
B)   are fat-soluble vitamins.
C)   are components of the plasma membrane.
D)   comprise the genetic material.
E)   play a role in the response of tissues to injuries.F) B) and C)
G) A) and E)

Question 11

Hyperventilation causes the loss of large amounts of carbon dioxide from the body, decreasing the amount of hydrogen ions in solution. As a result,

Accepted Answer

A)   the pH of body fluids will rise.
B)   the pH of body fluids will fall.
C)   the pH of body fluids will become neutral.
D)   the pH of body fluids will not be affected.
E)   None of these choices is correct.F) A) and D)
G) All of the above

Question 12

Which of the following organic groups does hemoglobin belong to?

Accepted Answer

A)   carbohydrate
B)   protein
C)   lipid
D)   nucleic acid
E)   vitaminF) B) and D)
G) C) and D)

Question 13

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "A"?

Accepted Answer

A)   hydrogen bond
B)   water molecule
C)   oxygen atom
D)   hydrogen atom
E)   polar covalent bondF) B) and E)
G) A) and E)

Question 14

-Phospholipids are important components of the plasma membrane. What does "C" represent on the diagram?

Accepted Answer

A)   phosphorus
B)   oxygen
C)   nitrogen
D)   polar (hydrophilic)  region
E)   nonpolar (hydrophobic)  regionF) A) and B)
G) B) and D)

Question 15

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

A)   estrogen
B)   bile salts
C)   testosterone
D)   prostaglandins
E)   progesteroneF) A) and D)
G) A) and C)

Question 16

The amount of matter in an object is its

Accepted Answer

A)   mass.
B)   weight.
C)   density.
D)   volume.
E)   size.F) C) and D)
G) A) and E)

Question 17

-The sodium chloride molecule breaks apart in water. What does "E" represent (the process) ?

Accepted Answer

A)   chloride ion
B)   dissociation
C)   water molecule
D)   sodium ion
E)   salt crystalF) D) and E)
G) None of the above

Question 18

Electrolytes are substances that

Accepted Answer

A)   form covalent bonds with water.
B)   conduct electricity when dissolved in water.
C)   cannot conduct electricity in solution.
D)   are NOT found in the human body in any appreciable amounts.
E)   are NOT charged particles.F) All of the above
G) A) and B)

Question 19

Enzymes are proteins that increase the rate of chemical reactions by

Accepted Answer

A)   increasing the activation energy of the reaction.
B)   decreasing the activation energy of the reaction.
C)   adjusting the temperature of the reaction.
D)   increasing the concentration of the reactants.E) A) and C)
F) A) and D)

Question 20

Triglycerides are composed of

Accepted Answer

A)   monosaccharides.
B)   amino acids.
C)   nucleotides.
D)   glycerol and fatty acids.
E)   None of these choices are correct.F) B) and D)
G) A) and C)

Exam 2: The Chemical Basis of Life

The amount of matter in an object is its

Correct AnswerverifiedShow Answer

Arrange the following from largest to smallest: (1) nucleus (2) DNA molecule (3) skin cell (4) chicken eggs

Correct AnswerverifiedShow Answer

Eicosanoids

Correct AnswerverifiedShow Answer

-Phospholipids are important components of the plasma membrane. What does "C" represent on the diagram?

Correct AnswerverifiedShow Answer

The element uranium has a mass number of 238 and contains 92 protons. What is the atomic number of uranium?

Correct AnswerverifiedShow Answer

A group of water molecules are held together by

Correct AnswerverifiedShow Answer

Triglycerides are composed of

Correct AnswerverifiedShow Answer

An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably

Correct AnswerverifiedShow Answer

Isotopes of the same element have

Correct AnswerverifiedShow Answer

Electrolytes are substances that

Correct AnswerverifiedShow Answer

Adjacent amino acids in a polypeptide chain are held together by

Correct AnswerverifiedShow Answer

Which of the following molecules is NOT made from cholesterol?

Correct AnswerverifiedShow Answer

-The sodium chloride molecule breaks apart in water. What does "E" represent (the process) ?

Correct AnswerverifiedShow Answer

The newly discovered element "zinferon" has a mass number of 425 and contains 125 protons. How many neutrons does an atom of this element contain?

Correct AnswerverifiedShow Answer

Which of the following organic groups does hemoglobin belong to?

Correct AnswerverifiedShow Answer

Which of the following organic groups does an enzyme belong to?

Correct AnswerverifiedShow Answer

Enzymes are proteins that increase the rate of chemical reactions by

Correct AnswerverifiedShow Answer

Hyperventilation causes the loss of large amounts of carbon dioxide from the body, decreasing the amount of hydrogen ions in solution. As a result,

Correct AnswerverifiedShow Answer

If the potential energy in the chemical bonds of the reactants is greater than the potential energy in the chemical bonds of the product,

Correct AnswerverifiedShow Answer

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "A"?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified