Question 1

The symbol ⇌,used in visual chemical reactions,means that

Accepted Answer

A)  the chemical reaction can go in either direction. 
B)  the concentration of the end products is the same as that of the reactants. 
C)  the substrates can become reactants and vice versa. 
D)  there is more end product than reactant. 
E)  input of energy is required. 
A)  the chemical reaction can go in either direction. 
B)  the concentration of the end products is the same as that of the reactants. 
C)  the substrates can become reactants and vice versa. 
D)  there is more end product than reactant. 
E)  input of energy is required. A

Question 2

The most acidic solution would have a pH of

Accepted Answer

A)  0. 
B)  7. 
C)  14. 
D)  4. 
E)  10. 
A)  0. 
B)  7. 
C)  14. 
D)  4. 
E)  10. A

Question 3

If a polypeptide contains 9 peptide bonds,how many amino acids does it contain?

Accepted Answer

A)  0 
B)  5 
C)  12 
D)  11 
E)  10 
A)  0 
B)  5 
C)  12 
D)  11 
E)  10 E

Question 4

Which statement about the reaction H₂ + Cl₂ → 2HCl is correct?

Accepted Answer

A)  H₂ and Cl₂ are the products. 
B)  HCl is the product. 
C)  One molecule of hydrogen contains one atom. 
D)  One molecule of chlorine contains one atom. 
E)  The reaction is unbalanced. 
A)  H₂ and Cl₂ are the products. 
B)  HCl is the product. 
C)  One molecule of hydrogen contains one atom. 
D)  One molecule of chlorine contains one atom. 
E)  The reaction is unbalanced.

Question 5

What is the primary composition of organic compounds?

Accepted Answer

A)  carbon and oxygen atoms 
B)  oxygen and hydrogen atoms 
C)  oxygen and nitrogen atoms 
D)  carbon and hydrogen atoms 
E)  nitrogen and carbon atoms 
A)  carbon and oxygen atoms 
B)  oxygen and hydrogen atoms 
C)  oxygen and nitrogen atoms 
D)  carbon and hydrogen atoms 
E)  nitrogen and carbon atoms

Question 6

If two pairs of electrons are shared between two atoms,what type of bond occurs?

Accepted Answer

A)  single covalent bond 
B)  double covalent bond 
C)  triple covalent bond 
D)  polar covalent bond 
E)  hydrogen bond 
A)  single covalent bond 
B)  double covalent bond 
C)  triple covalent bond 
D)  polar covalent bond 
E)  hydrogen bond

Question 7

Covalent bonds are formed when

Accepted Answer

A)  atoms share electrons. 
B)  cations and anions are held together by their opposite charges. 
C)  electrons are exchanged between atoms. 
D)  hydrogen forms bonds with negatively charged atoms in the same or different molecules. 
E)  two or more atoms lose electrons at the same time. 
A)  atoms share electrons. 
B)  cations and anions are held together by their opposite charges. 
C)  electrons are exchanged between atoms. 
D)  hydrogen forms bonds with negatively charged atoms in the same or different molecules. 
E)  two or more atoms lose electrons at the same time.

Question 8

Which nitrogenous base is unique to RNA molecules?

Accepted Answer

A)  uracil 
B)  cytosine 
C)  adenine 
D)  guanine 
E)  thymine 
A)  uracil 
B)  cytosine 
C)  adenine 
D)  guanine 
E)  thymine

Question 9

An oxygen atom can have 8,9,or 10 neutrons in its nucleus.This variation describes

Accepted Answer

A)  atomic number. 
B)  electric charge. 
C)  bonding characteristics. 
D)  isotopes. 
E)  proton therapy. 
A)  atomic number. 
B)  electric charge. 
C)  bonding characteristics. 
D)  isotopes. 
E)  proton therapy.

Question 10

Both chemically- and structurally-speaking,which of these compounds does not belong?

Accepted Answer

A)  carbohydrates 
B)  lipids 
C)  proteins 
D)  salts 
E)  nucleic acids 
A)  carbohydrates 
B)  lipids 
C)  proteins 
D)  salts 
E)  nucleic acids

Question 11

How does the RNA molecule differ from a DNA molecule?

Accepted Answer

RNA is usually single stranded

Question 12

Carbon dioxide is produced as a result of

Accepted Answer

A)  metabolic activity. 
B)  carbon monoxide instability. 
C)  oxygen synthesis during aerobic respiration. 
D)  the breakdown of water into oxygen. 
E)  glucose synthesis. 
A)  metabolic activity. 
B)  carbon monoxide instability. 
C)  oxygen synthesis during aerobic respiration. 
D)  the breakdown of water into oxygen. 
E)  glucose synthesis.

Question 13

A mixture of water and a salt would result in breaking down the salt into a mixture of cations and anions.This process is called

Accepted Answer

A)  dehydration synthesis. 
B)  dissociation. 
C)  hydrolysis. 
D)  condensation reaction. 
E)  equilibrium. 
A)  dehydration synthesis. 
B)  dissociation. 
C)  hydrolysis. 
D)  condensation reaction. 
E)  equilibrium.

Question 14

Which is the correct description of a molecule?

Accepted Answer

A)  It is an electrically charged atom. 
B)  It cannot be broken down physically. 
C)  It is comprised of two or more elements bonded together. 
D)  It is the smallest unit of matter. 
E)  It is comprised of two or more atoms sharing electrons. 
A)  It is an electrically charged atom. 
B)  It cannot be broken down physically. 
C)  It is comprised of two or more elements bonded together. 
D)  It is the smallest unit of matter. 
E)  It is comprised of two or more atoms sharing electrons.

Question 15

The molecule DNA contains the unique five-carbon sugar

Accepted Answer

A)  ribose. 
B)  pentose. 
C)  deoxyribose. 
D)  sucrose. 
E)  fructose. 
A)  ribose. 
B)  pentose. 
C)  deoxyribose. 
D)  sucrose. 
E)  fructose.

Question 16

Which of the following constitutes most of the total body weight in humans?

Accepted Answer

A)  water 
B)  acids 
C)  bases 
D)  salts 
E)  organic molecules 
A)  water 
B)  acids 
C)  bases 
D)  salts 
E)  organic molecules

Question 17

Why is it important to precisely regulate the pH of blood or other body fluids?

Accepted Answer

A)  Blood functions as an excellent solvent. 
B)  Blood and other body fluids have a very high heat capacity. 
C)  Dehydration synthesis of large molecules occurs. 
D)  Hydrogen ions are extremely reactive. 
E)  Some organic molecules have polar covalent bonds. 
A)  Blood functions as an excellent solvent. 
B)  Blood and other body fluids have a very high heat capacity. 
C)  Dehydration synthesis of large molecules occurs. 
D)  Hydrogen ions are extremely reactive. 
E)  Some organic molecules have polar covalent bonds.

Question 18

If an element is composed of atoms with an atomic number of 8 and a mass number of 14,then an electrically neutral atom of this element contains

Accepted Answer

A)  6 protons. 
B)  6 neutrons. 
C)  6 electrons. 
D)  14 protons. 
E)  14 electrons. 
A)  6 protons. 
B)  6 neutrons. 
C)  6 electrons. 
D)  14 protons. 
E)  14 electrons.

Question 19

Enzymes

Accepted Answer

A)  are lipids. 
B)  function as biological catalysts. 
C)  raise the activation energy for a reaction. 
D)  are carbohydrates. 
E)  are derived from cholesterol. 
A)  are lipids. 
B)  function as biological catalysts. 
C)  raise the activation energy for a reaction. 
D)  are carbohydrates. 
E)  are derived from cholesterol.

Question 20

Hydrolysis is an example of which type of reaction?

Accepted Answer

A)  exchange 
B)  reversible 
C)  anabolism 
D)  synthesis 
E)  decomposition 
A)  exchange 
B)  reversible 
C)  anabolism 
D)  synthesis 
E)  decomposition

The symbol ⇌,used in visual chemical reactions,means that

The most acidic solution would have a pH of

If a polypeptide contains 9 peptide bonds,how many amino acids does it contain?

Which statement about the reaction H₂ + Cl₂ → 2HCl is correct?

What is the primary composition of organic compounds?

If two pairs of electrons are shared between two atoms,what type of bond occurs?

Covalent bonds are formed when

Which nitrogenous base is unique to RNA molecules?

An oxygen atom can have 8,9,or 10 neutrons in its nucleus.This variation describes

Both chemically- and structurally-speaking,which of these compounds does not belong?

How does the RNA molecule differ from a DNA molecule?

Carbon dioxide is produced as a result of

A mixture of water and a salt would result in breaking down the salt into a mixture of cations and anions.This process is called

Which is the correct description of a molecule?

The molecule DNA contains the unique five-carbon sugar

Which of the following constitutes most of the total body weight in humans?

Why is it important to precisely regulate the pH of blood or other body fluids?

If an element is composed of atoms with an atomic number of 8 and a mass number of 14,then an electrically neutral atom of this element contains

Enzymes

Hydrolysis is an example of which type of reaction?

An Introduction to Anatomy and Physiology

Cell Structure and Function

The Tissue Level of Organization

The Integumentary System

The Skeletal System

The Muscular System

The Nervous System

The General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: The Heart

The Cardiovascular System: Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

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Development and Inheritance

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Exam 2: The Chemical Level of Organization

The symbol ⇌,used in visual chemical reactions,means that

The most acidic solution would have a pH of

If a polypeptide contains 9 peptide bonds,how many amino acids does it contain?

Which statement about the reaction H₂ + Cl₂ → 2HCl is correct?

What is the primary composition of organic compounds?

If two pairs of electrons are shared between two atoms,what type of bond occurs?

Covalent bonds are formed when

Which nitrogenous base is unique to RNA molecules?

An oxygen atom can have 8,9,or 10 neutrons in its nucleus.This variation describes

Both chemically- and structurally-speaking,which of these compounds does not belong?

How does the RNA molecule differ from a DNA molecule?

Carbon dioxide is produced as a result of

A mixture of water and a salt would result in breaking down the salt into a mixture of cations and anions.This process is called

Which is the correct description of a molecule?

The molecule DNA contains the unique five-carbon sugar

Which of the following constitutes most of the total body weight in humans?

Why is it important to precisely regulate the pH of blood or other body fluids?

If an element is composed of atoms with an atomic number of 8 and a mass number of 14,then an electrically neutral atom of this element contains

Enzymes

Hydrolysis is an example of which type of reaction?

An Introduction to Anatomy and Physiology

Cell Structure and Function

The Tissue Level of Organization

The Integumentary System

The Skeletal System

The Muscular System

The Nervous System

The General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: The Heart

The Cardiovascular System: Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

The Reproductive System

Development and Inheritance

Filters