Question 1

When a protein denatures,what happens to it?

Accepted Answer

A)  it becomes a functional protein 
B)  it combines with sugars to become a signaling protein 
C)  it changes its shape and to assume another function 
D)  it unwinds and loses its three dimensional shape 
E)  it is transported out of the cell 
A)  it becomes a functional protein 
B)  it combines with sugars to become a signaling protein 
C)  it changes its shape and to assume another function 
D)  it unwinds and loses its three dimensional shape 
E)  it is transported out of the cell

Question 2

What type of chemical bonds are found within a water molecule?

Accepted Answer

A)  hydrogen 
B)  ionic 
C)  polar covalent 
D)  nonpolar covalent 
E)  triple 
A)  hydrogen 
B)  ionic 
C)  polar covalent 
D)  nonpolar covalent 
E)  triple

Question 3

Electrons are shared in bonds called

Accepted Answer

A)  covalent bonds. 
B)  ionic bonds. 
C)  polar bonds. 
D)  nonpolar bonds. 
E)  all of these except ionic bonds. 
A)  covalent bonds. 
B)  ionic bonds. 
C)  polar bonds. 
D)  nonpolar bonds. 
E)  all of these except ionic bonds.

Question 4

Which of the following carbohydrates is the most abundant in the biosphere?

Accepted Answer

A)  glucose 
B)  starch 
C)  glycogen 
D)  sucrose 
E)  galactose 
A)  glucose 
B)  starch 
C)  glycogen 
D)  sucrose 
E)  galactose

Question 5

Which of the following is TRUE about water?

Accepted Answer

A)  The oxygen end is slightly electropositive. 
B)  Hydrogen bonds hold water molecules together. 
C)  Water covers about one-half of the surface of the earth. 
D)  Hydrophobic interactions attract water molecules. 
E)  Solvent properties are greatest with nonpolar molecules. 
A)  The oxygen end is slightly electropositive. 
B)  Hydrogen bonds hold water molecules together. 
C)  Water covers about one-half of the surface of the earth. 
D)  Hydrophobic interactions attract water molecules. 
E)  Solvent properties are greatest with nonpolar molecules.

Question 6

What type of bonds hold the two chains of DNA together in a DNA molecule?

Accepted Answer

A)  hydrogen 
B)  polar covalent 
C)  nonpolar covalent 
D)  ionic 
E)  more than one of these 
A)  hydrogen 
B)  polar covalent 
C)  nonpolar covalent 
D)  ionic 
E)  more than one of these

Question 7

Which property of water molecules is responsible for movement of water from roots to leaves in a plant?

Accepted Answer

A)  hydrophobicity 
B)  temperature stability 
C)  fusion 
D)  solvent polarity 
E)  cohesion 
A)  hydrophobicity 
B)  temperature stability 
C)  fusion 
D)  solvent polarity 
E)  cohesion

Question 8

Plants store their excess carbohydrates in the form of

Accepted Answer

A)  cellulose. 
B)  starch. 
C)  glycogen. 
D)  sucrose. 
E)  galactose. 
A)  cellulose. 
B)  starch. 
C)  glycogen. 
D)  sucrose. 
E)  galactose.

Question 9

Classification.The following are basic building blocks of macromolecules.Answer the questions with reference to those building blocks.
-the basic unit of ribonucleic acid

Accepted Answer

A) amino acids 
B) glucose 
C) glycerol 
D) fatty acids 
E) nucleotide
F)amino acids and glucose
G)amino acids and glycerol
H)glucose and glycerol
I)glucose and fatty acids
J)glycerol and fatty acids 
A) amino acids 
B) glucose 
C) glycerol 
D) fatty acids 
E) nucleotide
F)amino acids and glucose
G)amino acids and glycerol
H)glucose and glycerol
I)glucose and fatty acids
J)glycerol and fatty acids

Question 10

In an atom,____ spin around the nucleus.

Accepted Answer

A)  electrons 
B)  protons 
C)  neutrons 
D)  both neutrons and protons 
E)  both protons and electrons 
A)  electrons 
B)  protons 
C)  neutrons 
D)  both neutrons and protons 
E)  both protons and electrons

Question 11

A triglyceride molecule is made up of

Accepted Answer

A)  one glycerol and two fatty acids. 
B)  two fatty acids and two glycerols. 
C)  one fatty acid and three glycerols. 
D)  one glycerol and three fatty acids. 
E)  any of these. 
A)  one glycerol and two fatty acids. 
B)  two fatty acids and two glycerols. 
C)  one fatty acid and three glycerols. 
D)  one glycerol and three fatty acids. 
E)  any of these.

Question 12

Instability of radioisotopes is caused by

Accepted Answer

A)  sudden temperature variations. 
B)  environmental humidity. 
C)  the random motion of atoms. 
D)  the disintegration of a neutron into a proton and an electron. 
E)  the motion of electrons and neutrons. 
A)  sudden temperature variations. 
B)  environmental humidity. 
C)  the random motion of atoms. 
D)  the disintegration of a neutron into a proton and an electron. 
E)  the motion of electrons and neutrons.

Question 13

____ is the tendency of water molecules to stay attached to one another.

Accepted Answer

A)  Adhesion 
B)  Cohesion 
C)  Fusion 
D)  Interaction 
E)  Junction 
A)  Adhesion 
B)  Cohesion 
C)  Fusion 
D)  Interaction 
E)  Junction

Question 14

Deoxyribonucleic acid

Accepted Answer

A)  is one of the adenosine phosphates. 
B)  is one of the nucleotide coenzymes. 
C)  stores and retrieves heritable information in all cells. 
D)  translates protein-building instructions into actual protein structure. 
E)  is none of these. 
A)  is one of the adenosine phosphates. 
B)  is one of the nucleotide coenzymes. 
C)  stores and retrieves heritable information in all cells. 
D)  translates protein-building instructions into actual protein structure. 
E)  is none of these.

Question 15

Classification.The following are types of chemical bonds.Answer the questions with reference to those chemical bonds.
-the bond between the hydrogen atoms of molecular hydrogen

Accepted Answer

A) hydrogen 
B) ionic 
C) covalent 
A) hydrogen 
B) ionic 
C) covalent

Question 16

Which of the following statements is NOT true?

Accepted Answer

A)  All isotopes of an element have the same number of electrons. 
B)  All isotopes of an element have the same number of protons. 
C)  All isotopes of an element have the same number of neutrons. 
D)  All radioisotopes are unstable. 
E)  All isotopes of an element have the same atomic number. 
A)  All isotopes of an element have the same number of electrons. 
B)  All isotopes of an element have the same number of protons. 
C)  All isotopes of an element have the same number of neutrons. 
D)  All radioisotopes are unstable. 
E)  All isotopes of an element have the same atomic number.

Question 17

A solution with a pH of 8 has how many times fewer hydrogen ions than a solution with a pH of 6?

Accepted Answer

A)  2 
B)  5 
C)  10 
D)  100 
E)  1,000 
A)  2 
B)  5 
C)  10 
D)  100 
E)  1,000

Question 18

A pH of 10 is how many times as basic as a pH of 7?

Accepted Answer

A)  2 
B)  3 
C)  10 
D)  100 
E)  1,000 
A)  2 
B)  3 
C)  10 
D)  100 
E)  1,000

Question 19

Unsaturated fatty acids

Accepted Answer

A)  have fewer hydrogens than saturated fatty acids. 
B)  are more characteristic of animal fats than plant fats. 
C)  contribute to the possibility of arteriosclerosis. 
D)  have no double bonds. 
E)  are solid at room temperature. 
A)  have fewer hydrogens than saturated fatty acids. 
B)  are more characteristic of animal fats than plant fats. 
C)  contribute to the possibility of arteriosclerosis. 
D)  have no double bonds. 
E)  are solid at room temperature.

Question 20

Tracer isotopes

Accepted Answer

A)  are used only in plants. 
B)  work differently than nontracers in reactions. 
C)  have an unbalanced electrical charge. 
D)  are detected by their radioactivity. 
E)  are not found in nature. 
A)  are used only in plants. 
B)  work differently than nontracers in reactions. 
C)  have an unbalanced electrical charge. 
D)  are detected by their radioactivity. 
E)  are not found in nature.

Exam 2: Molecules of Life

When a protein denatures,what happens to it?

What type of chemical bonds are found within a water molecule?

Electrons are shared in bonds called

Which of the following carbohydrates is the most abundant in the biosphere?

Which of the following is TRUE about water?

What type of bonds hold the two chains of DNA together in a DNA molecule?

Which property of water molecules is responsible for movement of water from roots to leaves in a plant?

Plants store their excess carbohydrates in the form of

Classification.The following are basic building blocks of macromolecules.Answer the questions with reference to those building blocks. -the basic unit of ribonucleic acid

In an atom,____ spin around the nucleus.

A triglyceride molecule is made up of

Instability of radioisotopes is caused by

____ is the tendency of water molecules to stay attached to one another.

Deoxyribonucleic acid

Classification.The following are types of chemical bonds.Answer the questions with reference to those chemical bonds. -the bond between the hydrogen atoms of molecular hydrogen

Which of the following statements is NOT true?

A solution with a pH of 8 has how many times fewer hydrogen ions than a solution with a pH of 6?

A pH of 10 is how many times as basic as a pH of 7?

Unsaturated fatty acids

Tracer isotopes

Invitation to Biology

Cell Structure

Energy and Metabolism

Capturing and Releasing Energy

DNA Structure and Function

Gene Expression and Control

How Cells Reproduce

Patterns of Inheritance

Biotechnology

Evidence of Evolution

Processes of Evolution

Early Life Forms and the Viruses

Plants and Fungi

Animal Evolution

Population Ecology

Communities and Ecosystems

The Biosphere and Human Effects

Animal Tissues and Organs

How Animals Move

Circulation and Respiration

Immunity

Digestion and Excretion

Neural Control and the Senses

Endocrine Control

Reproduction and Development

Plant Form and Function

Plant Reproduction and Development

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