Question 1

Evaluate the reasons ribosomal genes are useful for comparing evolutionary relationships among organisms?

Accepted Answer

A)  Because there are many differences in these genes,even among closely related species
B)  Because all organisms possess these genes and they can be compared with each other
C)  Because these are the only genes that have been sequenced for every organism on Earth
D)  Because ribosomes of prokaryotes and eukaryotes are identical
E)  Because it is possible to compare the large subunit genes with the small subunit genes B

Question 2

When an aminoacyl-tRNA synthetase charges a tRNA it results in the release of which molecule?

Accepted Answer

A)  mRNA
B)  ATP
C)  AMP
D)  pyrophosphate
E)  AMP and pryophosphate

Question 3

What serves as the "translator" or intermediary between an mRNA codon and an amino acid?

Accepted Answer

A)  rRNA
B)  snRNA
C)  tRNA
D)  siRNA
E)  snRNPs

Question 4

The most common eukaryotic ribosome carries out its function in the

Accepted Answer

A)  Golgi apparatus.
B)  nucleus.
C)  cytosol.
D)  mitochondria.
E)  chloroplast.

Question 5

An mRNA sequence is 5'AUG-GGC-ACU-CAU-ACU-UAA3'F10,where AUG is the start codon and UAA is the stop codon.How many distinct aminoacyl-tRNA synthetases are required to translate the mRNA sequence?

Accepted Answer

A)  2
B)  3
C)  4
D)  5
E)  6

Question 6

When does the small ribosomal subunit bind to the translational complex in eukaryotic cells?

Accepted Answer

A)  It is the first component to bind to the mRNA
B)  After the initiator tRNA binds,but before the start codon has been found
C)  After the large ribosomal subunit binds,but before the initiator tRNA binds
D)  After the start codon has been found by initiator tRNA
E)  The small ribosomal subunit binds the initiator tRNA and this complex is the first to bind to the mRNA

Question 7

More than one codon can specify the same amino acid.

Accepted Answer

A) True 
 B)False

Question 8

Transcription begins near a site in the DNA called the

Accepted Answer

A)  promoter
B)  enhancer
C)  response element
D)  transcription unit
E)  regulatory sequence A

Question 9

The transcription process in a eukaryotic gene directly produces

Accepted Answer

A)  rRNA.
B)  pre-mRNA.
C)  mRNA.
D)  DNA.
E)  protein.

Question 10

What molecule(s) exhibits self-splicing?

Accepted Answer

A)  rRNA
B)  tRNA
C)  mRNA
D)  rRNA and tRNA
E)  rRNA and mRNA

Question 11

Which statement about RNA processing in eukaryotes is INCORRECT?

Accepted Answer

A)  Introns are simply excised out of pre-mRNA to produce the mature mRNA.
B)  A protein/RNA complex is used to remove introns from the pre-mRNA.
C)  A poly A tail is added on to the 3' end of the mRNA.
D)  A 7-methylguanosine cap is added on to the 5'end of the mRNA.
E)  Processing occurs in the nucleus.

Question 12

How many nucleotides are contained in a single codon?

Accepted Answer

A)  1
B)  3
C)  4
D)  6
E)  9

Question 13

What enzyme catalyzes the attachment of amino acids to tRNA molecules?

Accepted Answer

A)  helicase
B)  topoisomerase
C)  aminoacyl-tRNA synthetase
D)  ribosome
E)  translation factor

Question 14

Which region of a structural gene contains the information that specifies an amino acid sequence?

Accepted Answer

A)  promoter region
B)  transcribed region
C)  terminator
D)  regulatory sequence
E)  enhancer region B

Question 15

What process enables a single gene to encode two or more polypeptides that are different in their amino acid sequence?

Accepted Answer

A)  Reverse transcription
B)  Self-splicing
C)  Capping
D)  Alternative splicing
E)  Regulatory splicing

Question 16

Translation is a relatively slow process.

Accepted Answer

A) True 
 B)False

Question 17

What products of nonstructural genes are never translated?

Accepted Answer

A)  transfer RNA
B)  ribosomal RNA
C)  messenger RNA
D)  transfer RNA and ribosomal RNA
E)  ribosomal RNA and messenger RNA

Question 18

The amino acids of a growing polypeptide chain are held together by what kind of bond during the elongation stage of translation?

Accepted Answer

A)  hydrogen
B)  peptide
C)  glycosidic
D)  noncovalent
E)  lactose

Question 19

This mRNA transcript would result in what polypeptide sequence?
5'ACU-UUC-ACU-AUG-UUU-UUA-UCC-UCC-ACU-CCU-UGA 3'
Use the following codons and the amino acids they encode.
AUG = Start or Met;UUU,UUC = Phe;UUA,UUG = Leu;UCU,UCC = Ser;CCU,CCC = Pro;ACU,ACC = Thr;UGA = Stop.

Accepted Answer

A)  Thr-Phe-Thr
B)  Phe-Leu-Ser-Ser-Thr-Pro
C)  Met-Phe-Leu-Ser-Ser-Thr-Pro
D)  Thr-Phe-Thr-Phe-Leu-Ser-Ser-Thr-Pro
E)  Met-Phe-Leu-Ser-Ser

Question 20

If a DNA template strand has a sequence of 3' TACAATGTAGCC 5',then the RNA produced from it will be

Accepted Answer

A)  3'TACAATGTAGCC5'
B)  5'ATGTTACATCGG3'
C)  5'AUGUUACAUCGG3'
D)  3'AUGUUACAUCGG5'
E)  3'ATGTTACATCGG5'

Exam 10: Gene Expression at the Molecular Level

Evaluate the reasons ribosomal genes are useful for comparing evolutionary relationships among organisms?

Correct AnswerverifiedB

When an aminoacyl-tRNA synthetase charges a tRNA it results in the release of which molecule?

Correct AnswerverifiedShow Answer

What serves as the "translator" or intermediary between an mRNA codon and an amino acid?

Correct AnswerverifiedShow Answer

The most common eukaryotic ribosome carries out its function in the

Correct AnswerverifiedShow Answer

An mRNA sequence is 5'AUG-GGC-ACU-CAU-ACU-UAA3'F10,where AUG is the start codon and UAA is the stop codon.How many distinct aminoacyl-tRNA synthetases are required to translate the mRNA sequence?

Correct AnswerverifiedShow Answer

When does the small ribosomal subunit bind to the translational complex in eukaryotic cells?

Correct AnswerverifiedShow Answer

More than one codon can specify the same amino acid.

Correct AnswerverifiedShow Answer

Transcription begins near a site in the DNA called the

Correct AnswerverifiedA

The transcription process in a eukaryotic gene directly produces

Correct AnswerverifiedShow Answer

What molecule(s) exhibits self-splicing?

Correct AnswerverifiedShow Answer

Which statement about RNA processing in eukaryotes is INCORRECT?

Correct AnswerverifiedShow Answer

How many nucleotides are contained in a single codon?

Correct AnswerverifiedShow Answer

What enzyme catalyzes the attachment of amino acids to tRNA molecules?

Correct AnswerverifiedShow Answer

Which region of a structural gene contains the information that specifies an amino acid sequence?

Correct AnswerverifiedB

What process enables a single gene to encode two or more polypeptides that are different in their amino acid sequence?

Correct AnswerverifiedShow Answer

Translation is a relatively slow process.

Correct AnswerverifiedShow Answer

What products of nonstructural genes are never translated?

Correct AnswerverifiedShow Answer

The amino acids of a growing polypeptide chain are held together by what kind of bond during the elongation stage of translation?

Correct AnswerverifiedShow Answer

This mRNA transcript would result in what polypeptide sequence? 5'ACU-UUC-ACU-AUG-UUU-UUA-UCC-UCC-ACU-CCU-UGA 3' Use the following codons and the amino acids they encode. AUG = Start or Met;UUU,UUC = Phe;UUA,UUG = Leu;UCU,UCC = Ser;CCU,CCC = Pro;ACU,ACC = Thr;UGA = Stop.

Correct AnswerverifiedShow Answer

If a DNA template strand has a sequence of 3' TACAATGTAGCC 5',then the RNA produced from it will be

Correct AnswerverifiedShow Answer

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B

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B

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