Question 1

A water molecule is an example of which type of molecule?

Accepted Answer

A)  polar covalent 
B)  nonpolar covalent 
C)  ionic 
D)  coordinate covalent 
E)  network 
A)  polar covalent 
B)  nonpolar covalent 
C)  ionic 
D)  coordinate covalent 
E)  network

Question 2

Proteins that speed up chemical reactions are

Accepted Answer

A)  substrates. 
B)  reactants. 
C)  enzymes. 
D)  amino acids. 
E)  carboxyl groups. 
A)  substrates. 
B)  reactants. 
C)  enzymes. 
D)  amino acids. 
E)  carboxyl groups.

Question 3

A union between the electron structures of atoms is a(n)

Accepted Answer

A)  chemical bond. 
B)  hydrogen bond. 
C)  isotopic bond. 
D)  physical bond. 
E)  atomic bond. 
A)  chemical bond. 
B)  hydrogen bond. 
C)  isotopic bond. 
D)  physical bond. 
E)  atomic bond.

Question 4

The process by which one or more electrons from one molecule are donated to another molecule is

Accepted Answer

A)  condensation. 
B)  cleavage. 
C)  functional group transfer. 
D)  electron transfer. 
E)  rearrangement. 
A)  condensation. 
B)  cleavage. 
C)  functional group transfer. 
D)  electron transfer. 
E)  rearrangement.

Question 5

Radioisotopes

Accepted Answer

A)  are unstable and emit energy and particles to stabilize themselves. 
B)  are different elements from the "standard" elements. 
C)  are very stable and do not change over time. 
D)  contain more electrons than the "standard" element. 
E)  contain less electrons than the "standard" element. 
A)  are unstable and emit energy and particles to stabilize themselves. 
B)  are different elements from the "standard" elements. 
C)  are very stable and do not change over time. 
D)  contain more electrons than the "standard" element. 
E)  contain less electrons than the "standard" element.

Question 6

Choose the correct formula for the reaction that takes place between hydrogen and oxygen to produce water.

Accepted Answer

A)  H2 + O2 → H2O 
B)  H + O → H2O 
C)  2H2 + O2 → 2H2O 
D)  2H2O + O2 → 4H2O 
E)  2H2 + 2O2 → 2H2O 
A)  H2 + O2 → H2O 
B)  H + O → H2O 
C)  2H2 + O2 → 2H2O 
D)  2H2O + O2 → 4H2O 
E)  2H2 + 2O2 → 2H2O

Question 7

A hydrogen bond is

Accepted Answer

A)  a sharing of a pair of electrons between a hydrogen and an oxygen nucleus. 
B)  a sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus. 
C)  an attractive force that involves a hydrogen atom and an oxygen or a nitrogen atom that are either in two different molecules or within the same molecule. 
D)  found only in water molecules. 
E)  is the strongest form of chemical bond. 
A)  a sharing of a pair of electrons between a hydrogen and an oxygen nucleus. 
B)  a sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus. 
C)  an attractive force that involves a hydrogen atom and an oxygen or a nitrogen atom that are either in two different molecules or within the same molecule. 
D)  found only in water molecules. 
E)  is the strongest form of chemical bond.

Question 8

The bond formed when atoms share electrons is a(n) ____ bond.

Accepted Answer

A)  hydrogen 
B)  ionic 
C)  covalent 
D)  crystalline 
E)  network 
A)  hydrogen 
B)  ionic 
C)  covalent 
D)  crystalline 
E)  network

Question 9

The atomic number refers to the

Accepted Answer

A)  mass of an atom. 
B)  number of protons in an atom. 
C)  number of both protons and neutrons in an atom. 
D)  number of neutrons in an atom. 
E)  number of electrons in an atom. 
A)  mass of an atom. 
B)  number of protons in an atom. 
C)  number of both protons and neutrons in an atom. 
D)  number of neutrons in an atom. 
E)  number of electrons in an atom.

Question 10

How many natural elements exist on Earth?

Accepted Answer

A)  100 
B)  112 
C)  88 
D)  96 
E)  110 
A)  100 
B)  112 
C)  88 
D)  96 
E)  110

Question 11

Which of the following is composed of a 1:2:1 ratio of carbon to hydrogen to oxygen?

Accepted Answer

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

Question 12

What kind of bond exists between two amino acids?

Accepted Answer

A)  hydrogen 
B)  glycosidic 
C)  peptide 
D)  ionic 
E)  sulfhydroxyl 
A)  hydrogen 
B)  glycosidic 
C)  peptide 
D)  ionic 
E)  sulfhydroxyl

Question 13

A bond that joins atoms that have opposite charges is a(n)

Accepted Answer

A)  covalent bond. 
B)  hydrogen bond. 
C)  ionic bond. 
D)  coordinate covalent bond. 
E)  polar covalent bond. 
A)  covalent bond. 
B)  hydrogen bond. 
C)  ionic bond. 
D)  coordinate covalent bond. 
E)  polar covalent bond.

Question 14

Selecting the Exception Four of the five answers listed below possess electrons in the third orbital. The atomic number is at the right of the element. Select the exception.

Accepted Answer

A)  sodium (11) 
B)  magnesium (12) 
C)  chlorine (17) 
D)  nitrogen (7) 
E)  sulfur (16) 
A)  sodium (11) 
B)  magnesium (12) 
C)  chlorine (17) 
D)  nitrogen (7) 
E)  sulfur (16)

Question 15

The disruption of a protein's three-dimensional structure is called

Accepted Answer

A)  condensation. 
B)  hydrolysis. 
C)  ionization. 
D)  oxidation. 
E)  denaturation. 
A)  condensation. 
B)  hydrolysis. 
C)  ionization. 
D)  oxidation. 
E)  denaturation.

Question 16

Which part of the amino acid helps to determine its chemical properties?

Accepted Answer

A)  the amino group 
B)  the carboxyl group 
C)  the covalent bonds 
D)  the peptide bond 
E)  the R group 
A)  the amino group 
B)  the carboxyl group 
C)  the covalent bonds 
D)  the peptide bond 
E)  the R group

Question 17

Selecting the Exception Four of the five answers listed below are related as members of the same group. Select the exception.

Accepted Answer

A)  glucose 
B)  fructose 
C)  cellulose 
D)  ribose 
E)  deoxyribose 
A)  glucose 
B)  fructose 
C)  cellulose 
D)  ribose 
E)  deoxyribose

Question 18

A sugar or other molecule in which radioisotopes have been substituted for some atoms is a(n)

Accepted Answer

A)  enzyme. 
B)  reactant. 
C)  tracer. 
D)  subatomic particle. 
E)  quark. 
A)  enzyme. 
B)  reactant. 
C)  tracer. 
D)  subatomic particle. 
E)  quark.

Question 19

Which of the following is NOT a compound?

Accepted Answer

A)  salt 
B)  sugar 
C)  carbon 
D)  oxygen gas 
E)  water 
A)  salt 
B)  sugar 
C)  carbon 
D)  oxygen gas 
E)  water

Question 20

Which of the following exhibits fourth level (quaternary) structure?

Accepted Answer

A)  amino acids 
B)  lipids 
C)  glycogen 
D)  hemoglobin 
E)  complex carbohydrate 
A)  amino acids 
B)  lipids 
C)  glycogen 
D)  hemoglobin 
E)  complex carbohydrate

Exam 2: Chemistry of Life

A water molecule is an example of which type of molecule?

Proteins that speed up chemical reactions are

A union between the electron structures of atoms is a(n)

The process by which one or more electrons from one molecule are donated to another molecule is

Radioisotopes

Choose the correct formula for the reaction that takes place between hydrogen and oxygen to produce water.

A hydrogen bond is

The bond formed when atoms share electrons is a(n) ____ bond.

The atomic number refers to the

How many natural elements exist on Earth?

Which of the following is composed of a 1:2:1 ratio of carbon to hydrogen to oxygen?

What kind of bond exists between two amino acids?

A bond that joins atoms that have opposite charges is a(n)

Selecting the Exception Four of the five answers listed below possess electrons in the third orbital. The atomic number is at the right of the element. Select the exception.

The disruption of a protein's three-dimensional structure is called

Which part of the amino acid helps to determine its chemical properties?

Selecting the Exception Four of the five answers listed below are related as members of the same group. Select the exception.

A sugar or other molecule in which radioisotopes have been substituted for some atoms is a(n)

Which of the following is NOT a compound?

Which of the following exhibits fourth level (quaternary) structure?

Learning About Human Biology

Cells and How They Work

Tissues, Organs, and Organ Systems

The Skeletal System

The Muscular System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Development and Aging

Cell Reproduction

Introduction to Genetics

Chromosomes and Human Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Principles of Ecology

Human Impacts on the Biosphere

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