Question 1

A triglyceride consists of

Accepted Answer

A)  3 glycerols and 1 fatty acid.
B)  3 glucose molecules.
C)  3 fatty acids and 3 phosphate groups.
D)  3 fatty acids and 1 glycerol.E) C) and D)
F) All of the above

Question 2

Nucleic acids are

Accepted Answer

A)  very small,simple molecules.
B)  structural molecules that have no function other than support.
C)  composed of building blocks called nucleotides.
D)  primary sources of cellular energy.E) C) and D)
F) B) and C)

Question 3

The symbol Na+ represents a sodium atom that has lost an electron.

Accepted Answer

A) True 
 B)False

Question 4

Which of these is not a monosaccharide?

Accepted Answer

A)  Glucose
B)  Ribose
C)  6-carbon sugar
D)  SucroseE) A) and B)
F) A) and C)

Question 5

An example of a biomarker is

Accepted Answer

A)  cholesterol.
B)  any DNA sequence.
C)  sodium chloride.
D)  hydrogen.E) A) and B)
F) None of the above

Question 6

A CT scan differs from a conventional X-ray image because it is

Accepted Answer

A)  two dimensional.
B)  three dimensional.
C)  four dimensional.
D)  safer.E) All of the above
F) A) and B) B

Question 7

An electrolyte ionizes in water.

Accepted Answer

A) True 
 B)False

Question 8

An acid is an electrolyte that releases hydroxide ions (OH-)in water.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following molecules does not have a polar region?

Accepted Answer

A)  Water
B)  Triglyceride
C)  Water soluble amino acid
D)  GlucoseE) A) and B)
F) All of the above

Question 10

An acid reacting with a base is

Accepted Answer

A)  a synthesis reaction.
B)  hydrolysis.
C)  a decomposition reaction.
D)  an exchange reaction.E) B) and C)
F) A) and D)

Question 11

Matter is composed of elements,which are composed of _____.

Accepted Answer

A)  atoms
B)  inorganic molecules
C)  organic molecules
D)  chemicalsE) All of the above
F) A) and B)

Question 12

In phenylketonuria,an individual cannot break down the amino acid phenylalanine.Molecules that include phenylalanine build up in the blood,which causes intellectual disability and other symptoms.This inherited disease can be controlled by following a diet that is very low in

Accepted Answer

A)  carbohydrates.
B)  cholesterol.
C)  protein.
D)  nucleic acids.E) A) and C)
F) None of the above

Question 13

The pH scale measures the

Accepted Answer

A)  concentration of hydrogen ions in solution.
B)  number of molecules of salts dissolved in water.
C)  number of hydroxide ions in water.
D)  strength of an electrical current that a solution carries.E) A) and D)
F) A) and C)

Question 14

A simple carbohydrate

Accepted Answer

A)  has a molecular formula of C6H12O6.
B)  is a building block of protein.
C)  consists of several joined chains.
D)  has only one nucleotide.E) A) and D)
F) All of the above

Question 15

In an ionic bond

Accepted Answer

A)  each atom gains electrons.
B)  atoms share a pair or more of electrons.
C)  oppositely charged atoms attract.
D)  like-charged atoms repel.E) A) and B)
F) A) and C)

Question 16

The type of subatomic particle that does not have an electrical charge is a(n)________.

Accepted Answer

neutron

Question 17

A water solution that contains equal numbers of hydrogen ions and hydroxide ions is

Accepted Answer

A)  acidic.
B)  basic.
C)  alkaline.
D)  neutral.E) A) and B)
F) B) and C)

Question 18

The type of chemical bond formed when ions with opposite electrical charges attract is a(n)________ bond.

Accepted Answer

ionic

Question 19

DNA and RNA are nucleic acids.

Accepted Answer

A) True 
 B)False

Question 20

On the pH scale

Accepted Answer

A)  a tenfold difference in hydrogen ion concentration separates each whole number.
B)  the lower the whole number on the scale,the greater the H+ concentration.
C)  pH values above 7 are basic (alkaline) .
D)  all of the above.E) All of the above
F) A) and D)

Exam 2: Chemical Basis of Life

A triglyceride consists of

Correct AnswerverifiedShow Answer

Nucleic acids are

Correct AnswerverifiedShow Answer

The symbol Na+ represents a sodium atom that has lost an electron.

Correct AnswerverifiedShow Answer

Which of these is not a monosaccharide?

Correct AnswerverifiedShow Answer

An example of a biomarker is

Correct AnswerverifiedShow Answer

A CT scan differs from a conventional X-ray image because it is

Correct AnswerverifiedB

An electrolyte ionizes in water.

Correct AnswerverifiedShow Answer

An acid is an electrolyte that releases hydroxide ions (OH-)in water.

Correct AnswerverifiedShow Answer

Which of the following molecules does not have a polar region?

Correct AnswerverifiedShow Answer

An acid reacting with a base is

Correct AnswerverifiedShow Answer

Matter is composed of elements,which are composed of _____.

Correct AnswerverifiedShow Answer

In phenylketonuria,an individual cannot break down the amino acid phenylalanine.Molecules that include phenylalanine build up in the blood,which causes intellectual disability and other symptoms.This inherited disease can be controlled by following a diet that is very low in

Correct AnswerverifiedShow Answer

The pH scale measures the

Correct AnswerverifiedShow Answer

A simple carbohydrate

Correct AnswerverifiedShow Answer

In an ionic bond

Correct AnswerverifiedShow Answer

The type of subatomic particle that does not have an electrical charge is a(n)________.

Correct Answerverifiedneutron

A water solution that contains equal numbers of hydrogen ions and hydroxide ions is

Correct AnswerverifiedShow Answer

The type of chemical bond formed when ions with opposite electrical charges attract is a(n)________ bond.

Correct Answerverifiedionic

DNA and RNA are nucleic acids.

Correct AnswerverifiedShow Answer

On the pH scale

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

The symbol Na⁺ represents a sodium atom that has lost an electron.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

An acid is an electrolyte that releases hydroxide ions (OH^-)in water.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
neutron

Correct Answer
verified

Correct Answer
verified
ionic

Correct Answer
verified

Correct Answer
verified