Question 1

Catabolism builds up molecules and anabolism breaks down molecules.

Accepted Answer

A) True 
 B)False

Question 2

How many codons specify the twenty types of amino acids?

Accepted Answer

A)  61
B)  23
C)  46
D)  3E) All of the above
F) None of the above

Question 3

A sequence of DNA is CTGATGTCTA. Its complement is ________.

Accepted Answer

The answer of A sequence of DNA is CTGATGTCTA. Its...

Question 4

A cell may contain hundreds of different types of enzymes.

Accepted Answer

A) True 
 B)False

Question 5

Copying DNA information into an mRNA molecule is called

Accepted Answer

A)  translation.
B)  synthesis.
C)  replication.
D)  transcription.E) None of the above
F) All of the above

Question 6

Synthesis of a protein stops when

Accepted Answer

A)  any of three specific anticodons are encountered in the mRNA.
B)  there is no more DNA.
C)  any of three "stop" codons are encountered in the mRNA.
D)  the ribosome becomes fatigued.E) None of the above
F) B) and D)

Question 7

A different enzyme may catalyze the formation and the breakdown of the same molecule.

Accepted Answer

A) True 
 B)False

Question 8

Adenine and guanine are ________  and cytosine and thymine are ________.

Accepted Answer

purines; pyrimidines...

Question 9

An ATP molecule consists of an adenine, a ribose, and three phosphates.

Accepted Answer

A) True 
 B)False

Question 10

If an organism is known to have a mutation in the DNA sequence of a gene that codes for an enzyme, but still produces a functional enzyme, which of the following is most likely TRUE?

Accepted Answer

A)  The mutation did not lead to a change in the amino acid sequence of the enzyme.
B)  Chaperone proteins are able to repair the error in the DNA sequence.
C)  The mutation must have occurred in the part of the sequence coding for the active site.
D)  Transcription of the gene into RNA is able to repair the mutation.E) A) and B)
F) B) and D)

Question 11

Energy is defined as

Accepted Answer

A)  something important for chemical reactions.
B)  the ability to do work.
C)  the heat given off from chemical reactions.
D)  the heat required to start a reaction.E) B) and D)
F) None of the above

Question 12

The portion of a DNA molecule that contains the genetic information for making a protein is called a gene.

Accepted Answer

A) True 
 B)False

Question 13

For each acetyl CoA molecule that enters the citric acid cycle, 2 ATPs, 16 H atoms, and 4 CO₂ molecules are produced.

Accepted Answer

A) True 
 B)False

Question 14

In the DNA damage response,

Accepted Answer

A)  repair enzymes replace mismatched nucleotides in DNA.
B)  repair enzymes replace mismatched nucleotides in RNA.
C)  repair enzymes replace mismatched amino acids in protein.
D)  more than one codon encodes one type of amino acid.E) A) and B)
F) None of the above

Question 15

Lactose is a disaccharide found in milk. Individuals who are lactose intolerant lack the enzyme to break this sugar down into monosaccharides. Based on enzyme nomenclature, what enzyme is deficient in these individuals?

Accepted Answer

A)  Lact ese
B)  Lact ose
C)  Lacto gen
D)  Lact aseE) C) and D)
F) A) and C)

Question 16

In glycolysis, the enzyme phosphofructokinase catalyzes the slowest part of this metabolic process and can therefore be considered a rate-limiting enzyme.

Accepted Answer

A) True 
 B)False

Question 17

The molecule that an enzyme affects is its ________.

Accepted Answer

The answer of The molecule that an enzyme affects is...

Question 18

Which of the following best describes the interaction between an enzyme and its substrate?

Accepted Answer

A)  The enzyme surrounds and completely contains the substrate.
B)  The substrate surrounds and completely contains the enzyme.
C)  The enzyme temporarily deactivates the substrate.
D)  Part of the enzyme temporarily binds part of the substrate molecule.E) C) and D)
F) A) and B)

Question 19

In DNA replication, the two strands of the double helix separate and enzymes place A, C, G, and U nucleotides opposite their complements, forming two double helices from one.

Accepted Answer

A) True 
 B)False

Question 20

A DNA sequence AACGGTGCACCACGG encodes an mRNA of sequence

Accepted Answer

A)  AACGGUGCACCACGG.
B)  UUGCCACGUGGUGCC.
C)  AACGGTGCACCACGG.
D)  UUCGGAGCUCCUCGG.E) A) and C)
F) A) and B)

Exam 4: Cellular Metabolism

In DNA replication, the two strands of the double helix separate and enzymes place A, C, G, and U nucleotides opposite their complements, forming two double helices from one.

Correct AnswerverifiedShow Answer

Energy is defined as

Correct AnswerverifiedShow Answer

Lactose is a disaccharide found in milk. Individuals who are lactose intolerant lack the enzyme to break this sugar down into monosaccharides. Based on enzyme nomenclature, what enzyme is deficient in these individuals?

Correct AnswerverifiedShow Answer

For each acetyl CoA molecule that enters the citric acid cycle, 2 ATPs, 16 H atoms, and 4 CO₂ molecules are produced.

Correct AnswerverifiedShow Answer

Which of the following best describes the interaction between an enzyme and its substrate?

Correct AnswerverifiedShow Answer

A cell may contain hundreds of different types of enzymes.

Correct AnswerverifiedShow Answer

A DNA sequence AACGGTGCACCACGG encodes an mRNA of sequence

Correct AnswerverifiedShow Answer

In the DNA damage response,

Correct AnswerverifiedShow Answer

Catabolism builds up molecules and anabolism breaks down molecules.

Correct AnswerverifiedShow Answer

Synthesis of a protein stops when

Correct AnswerverifiedShow Answer

How many codons specify the twenty types of amino acids?

Correct AnswerverifiedShow Answer

A different enzyme may catalyze the formation and the breakdown of the same molecule.

Correct AnswerverifiedShow Answer

Adenine and guanine are ________ and cytosine and thymine are ________.

Correct Answerverifiedpurines; pyrimidines...View AnswerShow Answer

A sequence of DNA is CTGATGTCTA. Its complement is ________.

Correct AnswerverifiedShow Answer

In glycolysis, the enzyme phosphofructokinase catalyzes the slowest part of this metabolic process and can therefore be considered a rate-limiting enzyme.

Correct AnswerverifiedShow Answer

Copying DNA information into an mRNA molecule is called

Correct AnswerverifiedShow Answer

The molecule that an enzyme affects is its ________.

Correct AnswerverifiedShow Answer

The portion of a DNA molecule that contains the genetic information for making a protein is called a gene.

Correct AnswerverifiedShow Answer

If an organism is known to have a mutation in the DNA sequence of a gene that codes for an enzyme, but still produces a functional enzyme, which of the following is most likely TRUE?

Correct AnswerverifiedShow Answer

An ATP molecule consists of an adenine, a ribose, and three phosphates.

Correct AnswerverifiedShow Answer

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Adenine and guanine are and cytosine and thymine are .

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purines; pyrimidines...
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