Question 1

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.F) A) and D)
G) B) and 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.F) C) and D)
G) A) and D) A

Question 3

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)   12F) B) and C)
G) A) and B)

Question 4

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.F) D) and E)
G) B) and E)

Question 5

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)   13.8F) B) and D)
G) B) and C)

Question 6

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.F) A) and B)
G) B) and C)

Question 7

____ 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)   CholesterolF) C) and D)
G) B) and D) A

Question 8

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)   chitinF) A) and D)
G) A) and E)

Question 9

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 covalentF) A) and C)
G) B) and C)

Question 10

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)   solventF) B) and C)
G) B) and E)

Question 11

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)   molecularF) B) and C)
G) A) and E)

Question 12

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)   3F) None of the above
G) D) and E)

Question 13

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 acidsF) C) and E)
G) B) and C)

Question 14

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.F) All of the above
G) None of the above

Question 15

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, COOHF) A) and B)
G) C) and D)

Question 16

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 acidF) A) and D)
G) A) and C) D

Question 17

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.F) A) and E)
G) A) and C)

Question 18

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.F) A) and B)
G) A) and C)

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.F) A) and E)
G) C) and E)

Question 20

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.F) A) and B)
G) A) and C)

Exam 2: The Molecules of Cells

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

Correct AnswerverifiedShow Answer

The primary function of carbohydrates is

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If neutral atoms become positive ions,they

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

Hydrogen bonding produces which following property of water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calcium chloride,CaCl2,is an ionic compound in which

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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A

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A

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

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D

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Calcium chloride,CaCl₂,is an ionic compound in which

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