Question 1

Which type of lipid molecule is characterized by a backbone of four fused rings?

Accepted Answer

A)  DNA 
B)  phospholipid 
C)  triglyceride 
D)  steroid 
E)  amino acid 
A)  DNA 
B)  phospholipid 
C)  triglyceride 
D)  steroid 
E)  amino acid D

Question 2

The primary function of carbohydrates is

Accepted Answer

A)  quick fuel and short-term energy storage. 
B)  structural reinforcement of plant and fungal cell walls. 
C)  encoding the hereditary information. 
D)  to speed chemical reactions in cells. 
E)  to transport molecules across cell membranes. 
A)  quick fuel and short-term energy storage. 
B)  structural reinforcement of plant and fungal cell walls. 
C)  encoding the hereditary information. 
D)  to speed chemical reactions in cells. 
E)  to transport molecules across cell membranes. A

Question 3

____ is a polysaccharide that is found in plant cell walls and accounts for their strength.

Accepted Answer

A)  Cellulose 
B)  Chitin 
C)  Glycogen 
D)  Starch 
E)  Cholesterol 
A)  Cellulose 
B)  Chitin 
C)  Glycogen 
D)  Starch 
E)  Cholesterol A

Question 4

Which nutrient source is the easiest one for humans to breakdown and form ATP?

Accepted Answer

A)  glucose 
B)  protein 
C)  cellulose 
D)  phospholipids 
E)  chitin 
A)  glucose 
B)  protein 
C)  cellulose 
D)  phospholipids 
E)  chitin

Question 5

Which of the following statements is NOT true of chemical bonds?

Accepted Answer

A)  Both ionic and covalent bonds involve electrons in the outer shell. 
B)  Covalent bonds share electrons between two atoms. 
C)  An atom involved in an ionic bond has an unequal number of electrons and protons. 
D)  Salts are covalently bonded. 
E)  The atoms in a molecule of water (H2O) are covalently bound together. 
A)  Both ionic and covalent bonds involve electrons in the outer shell. 
B)  Covalent bonds share electrons between two atoms. 
C)  An atom involved in an ionic bond has an unequal number of electrons and protons. 
D)  Salts are covalently bonded. 
E)  The atoms in a molecule of water (H2O) are covalently bound together.

Question 6

The _____ structure of a protein consists of the sequence of the amino acids joined together by peptide bonds.

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  molecular 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  molecular

Question 7

Hydrogen bonding produces which following property of water?

Accepted Answer

A)  Boiling at a lower temperature than expected. 
B)  Water is less dense as ice than as liquid water. 
C)  Water absorbs heat with a large change in temperature. 
D)  Water releases heat with a large change in temperature. 
E)  Water can be more dense as ice than as liquid water. 
A)  Boiling at a lower temperature than expected. 
B)  Water is less dense as ice than as liquid water. 
C)  Water absorbs heat with a large change in temperature. 
D)  Water releases heat with a large change in temperature. 
E)  Water can be more dense as ice than as liquid water.

Question 8

Water is a liquid at room temperature.This is due to

Accepted Answer

A)  ionic bonding of the atoms in the water molecule. 
B)  covalent bonding in the water molecule. 
C)  covalent bonding between water molecules. 
D)  hydrogen bonding within the water molecule. 
E)  hydrogen bonding between water molecules. 
A)  ionic bonding of the atoms in the water molecule. 
B)  covalent bonding in the water molecule. 
C)  covalent bonding between water molecules. 
D)  hydrogen bonding within the water molecule. 
E)  hydrogen bonding between water molecules.

Question 9

The pH of blood is slightly basic.Which of the following would therefore be an expected pH for blood?

Accepted Answer

A)  6.4 
B)  4.6 
C)  4.7 
D)  7.4 
E)  13.8 
A)  6.4 
B)  4.6 
C)  4.7 
D)  7.4 
E)  13.8

Question 10

Which group of lipids will contain hydrophilic heads that face outwards and hydrophobic tails that face inwards that will form a barrier?

Accepted Answer

A)  phospholipids 
B)  steroids 
C)  triglycerides 
D)  saturated acids 
E)  trans-fatty acids 
A)  phospholipids 
B)  steroids 
C)  triglycerides 
D)  saturated acids 
E)  trans-fatty acids

Question 11

Which of the following radioactive isotopes are used to detect whether or not an individual has a healthy thyroid?

Accepted Answer

A)  I131 
B)  C14 
C)  glucose 
D)  H2 
E)  All of the above can be used. 
A)  I131 
B)  C14 
C)  glucose 
D)  H2 
E)  All of the above can be used.

Question 12

If an element has an atomic number of 12,how many electrons are in its outermost shell?

Accepted Answer

A)  1 
B)  10 
C)  8 
D)  2 
E)  12 
A)  1 
B)  10 
C)  8 
D)  2 
E)  12

Question 13

During the formation of a polymer,two monomers are joined by the removal of a _______ & _______.

Accepted Answer

A)  OH, H 
B)  OH, SH 
C)  H, COH 
D)  COOH, SH 
E)  NHH, COOH 
A)  OH, H 
B)  OH, SH 
C)  H, COH 
D)  COOH, SH 
E)  NHH, COOH

Question 14

Potassium,a metal with one electron in the outermost shell,will react with how many chlorine atoms? (Chlorine is a nonmetal with seven electrons in the outermost shell.)

Accepted Answer

A)  5 
B)  7 
C)  1 
D)  2 
E)  3 
A)  5 
B)  7 
C)  1 
D)  2 
E)  3

Question 15

What type of bond will connect the amino acids in a protein?

Accepted Answer

A)  peptide 
B)  triple covalent 
C)  polar covalent 
D)  ionic 
E)  double covalent 
A)  peptide 
B)  triple covalent 
C)  polar covalent 
D)  ionic 
E)  double covalent

Question 16

If neutral atoms become positive ions,they

Accepted Answer

A)  gain electrons. 
B)  lose electrons. 
C)  gain protons. 
D)  lose protons. 
E)  do not change. 
A)  gain electrons. 
B)  lose electrons. 
C)  gain protons. 
D)  lose protons. 
E)  do not change.

Question 17

A genetic mutation can cause a change in the sequence of the 20 amino acids used to build proteins.Such a change is a change to the protein's

Accepted Answer

A)  primary structure only. 
B)  secondary structure only. 
C)  tertiary structure only. 
D)  primary structure, but this will likely alter higher levels of structure as well. 
E)  quaternary structure only. 
A)  primary structure only. 
B)  secondary structure only. 
C)  tertiary structure only. 
D)  primary structure, but this will likely alter higher levels of structure as well. 
E)  quaternary structure only.

Question 18

Which of the following functional groups is present in amino acids?

Accepted Answer

A)  SH 
B)  NHH 
C)  COOH 
D)  OH 
E)  All of these are present in amino acids. 
A)  SH 
B)  NHH 
C)  COOH 
D)  OH 
E)  All of these are present in amino acids.

Question 19

Calcium chloride,CaCl2,is an ionic compound in which

Accepted Answer

A)  one chlorine atom transferred an electron to the other chlorine atom. 
B)  each chlorine atom has lost electrons. 
C)  calcium has two extra electrons in its innermost shell. 
D)  calcium has gained two electrons. 
E)  calcium has lost two electrons. 
A)  one chlorine atom transferred an electron to the other chlorine atom. 
B)  each chlorine atom has lost electrons. 
C)  calcium has two extra electrons in its innermost shell. 
D)  calcium has gained two electrons. 
E)  calcium has lost two electrons.

Question 20

You notice that rain water forms "beads" on your car.This is an example of what property of water?

Accepted Answer

A)  cohesion 
B)  dissociation 
C)  high heat of vaporization 
D)  adhesion 
E)  solvent 
A)  cohesion 
B)  dissociation 
C)  high heat of vaporization 
D)  adhesion 
E)  solvent

Exam 2: The Molecules of Cells

Which type of lipid molecule is characterized by a backbone of four fused rings?

The primary function of carbohydrates is

____ is a polysaccharide that is found in plant cell walls and accounts for their strength.

Which nutrient source is the easiest one for humans to breakdown and form ATP?

Which of the following statements is NOT true of chemical bonds?

The _____ structure of a protein consists of the sequence of the amino acids joined together by peptide bonds.

Hydrogen bonding produces which following property of water?

Water is a liquid at room temperature.This is due to

The pH of blood is slightly basic.Which of the following would therefore be an expected pH for blood?

Which group of lipids will contain hydrophilic heads that face outwards and hydrophobic tails that face inwards that will form a barrier?

Which of the following radioactive isotopes are used to detect whether or not an individual has a healthy thyroid?

If an element has an atomic number of 12,how many electrons are in its outermost shell?

During the formation of a polymer,two monomers are joined by the removal of a _______ & _______.

Potassium,a metal with one electron in the outermost shell,will react with how many chlorine atoms? (Chlorine is a nonmetal with seven electrons in the outermost shell.)

What type of bond will connect the amino acids in a protein?

If neutral atoms become positive ions,they

A genetic mutation can cause a change in the sequence of the 20 amino acids used to build proteins.Such a change is a change to the protein's

Which of the following functional groups is present in amino acids?

Calcium chloride,CaCl2,is an ionic compound in which

You notice that rain water forms "beads" on your car.This is an example of what property of water?

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During the formation of a polymer,two monomers are joined by the removal of a _ & _.

Calcium chloride,CaCl₂,is an ionic compound in which