Question 1

An acid with a pH of 6 has________ hydrogen ions than pure water.

Accepted Answer

A)   10-fold fewer
B)   100-fold more
C)   100-fold fewer
D)   10-fold moreE) B) and C)
F) B) and D)

Question 2

Select the most correct statement regarding nucleic acids.

Accepted Answer

A)   Three forms exist: DNA, RNA, and tDNA.
B)   RNA is a long, single-stranded molecule made up of the bases A, T, G, and C.
C)   DNA is a long, double-stranded molecule made up of A, T, G, and C bases.
D)   tDNA is considered a "molecular slave" of DNA during protein synthesis.E) C) and D)
F) A) and D)

Question 3

How can DNA be used to "fingerprint" a suspect in a crime?

Accepted Answer

The DNA of a person is unique to that in...

Question 4

All organic compounds contain carbon.

Accepted Answer

A) True 
 B)False

Question 5

In general, the lipids that we refer to as oils have ________.

Accepted Answer

A)   a high water content
B)   long fatty acid chains
C)   unsaturated fatty acids
D)   saturated fatty acidsE) A) and B)
F) C) and D)

Question 6

Salts are always________.

Accepted Answer

A)   ionic compounds
B)   hydrogen bonded
C)   double covalent compounds
D)   single covalent compoundsE) None of the above
F) A) and D)

Question 7

The numbers listed represent the number of electrons in the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom?

Accepted Answer

A)   2, 8, 1
B)   2, 8, 8
C)   2, 8
D)   2E) All of the above
F) A) and B)

Question 8

Which of the following elements is necessary for proper conduction of nerve impulses?

Accepted Answer

A)   P
B)   I
C)   Fe
D)   NaE) A) and B)
F) A) and C)

Question 9

Which of the following does not describe enzymes?

Accepted Answer

A)   Some enzymes are protein plus a cofactor.
B)   Enzymes work by raising the energy of activation.
C)   Some enzymes are purely protein.
D)   Each enzyme is chemically specific.E) C) and D)
F) A) and B)

Question 10

Are all chemical reactions reversible? If not, why aren't they all reversible?

Accepted Answer

All chemical reactions are the...

Question 11

A 65-year-old patient came to the emergency room with complaints of severe heartburn unrelieved by taking a "large handful" of antacids. Would you expect the pH to be high or low? Explain why.

Accepted Answer

You would expect a high pH. Taking antac...

Question 12

The chemical symbol O= O means ________.

Accepted Answer

A)   the atoms are double bonded
B)   both atoms are bonded and have zero electrons in the outer orbit
C)   this is an ionic bond with two shared electrons
D)   zero equals zeroE) All of the above
F) A) and B)

Question 13

The pH of body fluids must remain fairly constant for the body to maintain homeostasis.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is the major positive ion outside cells?

Accepted Answer

A)   potassium
B)   sodium
C)   hydrogen
D)   magnesiumE) C) and D)
F) A) and C)

Question 15

Which of the following is chemically inert (unreactive) ?

Accepted Answer

A)   sodium (atomic number 11) 
B)   oxygen (atomic number 8) 
C)   neon (atomic number 10) 
D)   carbon (atomic number 6) E) A) and D)
F) None of the above

Question 16

The basic structural material of the body consists of ________.

Accepted Answer

A)   nucleic acids
B)   carbohydrates
C)   proteins
D)   lipidsE) C) and D)
F) A) and B)

Question 17

Amino acids joining together to make a peptide is a good example of a(n)  ________ reaction.

Accepted Answer

A)   synthesis
B)   reversible
C)   exchange
D)   decompositionE) C) and D)
F) A) and B)

Question 18

The genetic information is coded in DNA by the ________.

Accepted Answer

A)   three-dimensional structure of the double helix
B)   sequence of the nucleotides
C)   arrangement of the histones
D)   regular alteration of sugar and phosphate moleculesE) A) and D)
F) A) and C)

Question 19

Which statement about enzymes is false?

Accepted Answer

A)   Most enzymes can catalyze millions of reactions per minute.
B)   Enzymes require contact with substrate in order to assume their active form.
C)   Enzymes may be damaged by high temperature.
D)   Enzymes may use coenzymes derived from vitamins or cofactors from metallic elements.E) A) and D)
F) B) and C)

Question 20

Which of the following does not characterize proteins?

Accepted Answer

A)   They have both functional and structural roles in the body.
B)   They may be denatured or coagulated by heat or acidity.
C)   They appear to be the molecular carriers of coded hereditary information.
D)   Their function depends on their three-dimensional shape.E) A) and B)
F) C) and D)

Exam 2: Chemistry Comes Alive

Which of the following does not characterize proteins?

Correct AnswerverifiedShow Answer

The pH of body fluids must remain fairly constant for the body to maintain homeostasis.

Correct AnswerverifiedShow Answer

Which of the following is chemically inert (unreactive) ?

Correct AnswerverifiedShow Answer

Which of the following elements is necessary for proper conduction of nerve impulses?

Correct AnswerverifiedShow Answer

How can DNA be used to "fingerprint" a suspect in a crime?

Correct AnswerverifiedThe DNA of a person is unique to that in...View AnswerShow Answer

In general, the lipids that we refer to as oils have ________.

Correct AnswerverifiedShow Answer

Which of the following does not describe enzymes?

Correct AnswerverifiedShow Answer

The numbers listed represent the number of electrons in the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom?

Correct AnswerverifiedShow Answer

Which statement about enzymes is false?

Correct AnswerverifiedShow Answer

Are all chemical reactions reversible? If not, why aren't they all reversible?

Correct AnswerverifiedAll chemical reactions are the...View AnswerShow Answer

The chemical symbol O= O means ________.

Correct AnswerverifiedShow Answer

An acid with a pH of 6 has________ hydrogen ions than pure water.

Correct AnswerverifiedShow Answer

All organic compounds contain carbon.

Correct AnswerverifiedShow Answer

The genetic information is coded in DNA by the ________.

Correct AnswerverifiedShow Answer

Salts are always________.

Correct AnswerverifiedShow Answer

Select the most correct statement regarding nucleic acids.

Correct AnswerverifiedShow Answer

The basic structural material of the body consists of ________.

Correct AnswerverifiedShow Answer

A 65-year-old patient came to the emergency room with complaints of severe heartburn unrelieved by taking a "large handful" of antacids. Would you expect the pH to be high or low? Explain why.

Correct AnswerverifiedYou would expect a high pH. Taking antac...View AnswerShow Answer

Which of the following is the major positive ion outside cells?

Correct AnswerverifiedShow Answer

Amino acids joining together to make a peptide is a good example of a(n) ________ reaction.

Correct AnswerverifiedShow Answer

Correct Answer
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The DNA of a person is unique to that in...
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All chemical reactions are the...
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You would expect a high pH. Taking antac...
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Correct Answer
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