Question 1

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 2

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. 
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.

Question 3

The amount of matter in an object is its

Accepted Answer

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

Question 4

-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 bond 
A)  hydrogen bond 
B)  water molecule 
C)  oxygen atom 
D)  hydrogen atom 
E)  polar covalent bond

Question 5

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. 
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.

Question 6

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. 
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.

Question 7

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. 
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.

Question 8

-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) region 
A)  phosphorus 
B)  oxygen 
C)  nitrogen 
D)  polar (hydrophilic) region 
E)  nonpolar (hydrophobic) region

Question 9

-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 crystal 
A)  chloride ion 
B)  dissociation 
C)  water molecule 
D)  sodium ion 
E)  salt crystal

Question 10

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

Question 11

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

Question 12

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

A)  estrogen 
B)  bile salts 
C)  testosterone 
D)  prostaglandins 
E)  progesterone 
A)  estrogen 
B)  bile salts 
C)  testosterone 
D)  prostaglandins 
E)  progesterone

Question 13

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. 
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.

Question 14

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. 
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.

Question 15

Which of the following organic groups does hemoglobin belong to?

Accepted Answer

A)  carbohydrate 
B)  protein 
C)  lipid 
D)  nucleic acid 
E)  vitamin 
A)  carbohydrate 
B)  protein 
C)  lipid 
D)  nucleic acid 
E)  vitamin

Question 16

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, 1 
A)  1, 2, 3, 4 
B)  4, 3, 1, 2 
C)  3, 4, 2, 1 
D)  2, 3, 1, 4 
E)  4, 2, 3, 1

Question 17

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

Question 18

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 19

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

Accepted Answer

A)  carbohydrate 
B)  protein 
C)  lipid 
D)  nucleic acid 
E)  vitamin 
A)  carbohydrate 
B)  protein 
C)  lipid 
D)  nucleic acid 
E)  vitamin

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

Exam 2: The Chemical Basis of Life

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

Electrolytes are substances that

The amount of matter in an object is its

-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"?

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

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

Eicosanoids

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

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

A group of water molecules are held together by

Adjacent amino acids in a polypeptide chain are held together by

Which of the following molecules is NOT made from cholesterol?

Enzymes are proteins that increase the rate of chemical reactions by

Isotopes of the same element have

Which of the following organic groups does hemoglobin belong to?

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

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

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?

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

Triglycerides are composed of

The Human Organism

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Temperature Regulation

Urinary System

Water, Electrolytes, and Acidbase Balance

Reproductive System

Development, Growth, Aging, and Genetics

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