Molecular Biology Review

11 Questions | By Adwohlwill | Updated: Nov 19, 2013 | Attempts: 426

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1.

The anticodon is
- A.
  
  On the mRNA
- B.
  
  On the tRNA
- C.
  
  On the DNA
- D.
  
  On the protein
Correct Answer
B. On the tRNA

Explanation
Anticodons are a part of the tRNA that pairs with the codon

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2.

The tRNA that is base pairing with the codon is in the
- A.
  
  A site
- B.
  
  P site
- C.
  
  E site
- D.
  
  None of the above
Correct Answer
B. P site

Explanation
The P site is the middle of the 3 ribosome sites. tRNAs move there after the peptide bond is formed

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3.

If the anticodon is 5'AGC3' then the codon is
- A.
  
  5'UCG3'
- B.
  
  5'TGC3'
- C.
  
  5'AGC3'
- D.
  
  5'GCU3'
Correct Answer
D. 5'GCU3'

Explanation
The anticodon and codon pair and they run in opposite directions (anti parallel)

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4.

If the anticodon is 5'AGC3' then the amino acid attached to the codon is (Use your codon table)
- A.
  
  Cys
- B.
  
  Gly
- C.
  
  Ala
- D.
  
  A stop codon
Correct Answer
C. Ala

Explanation
The codon (from the previous question is GCU, so the amino acid is Ala

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5.

A section of DNA is 5' AAA TTT CAT 3' If this is transcribed and translated, the resulting amino acid sequence is
- A.
  
  LYS PHE HIS
- B.
  
  PHE LYS VAL
- C.
  
  MET LYS PHE
- D.
  
  MET PHE LYS
Correct Answer
C. MET LYS PHE

Explanation
The mRNA is 5'AUG AAA UUU3' which gives MET LYS PHE

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6.

The DNA in the section above changes to 5' TTA TTT CAT 3' If this is transcribed and translated, the resulting amino acid sequence will be (compared to the sequence in the qeustion above) (Use your codon table) The amino acid sequence in the previous question was MET LYS PHE
- A.
  
  Have one less amino acid
- B.
  
  Have one more amino acid
- C.
  
  Have the same number of amino acids,but one will be different
- D.
  
  The amino acids will not change at all
Correct Answer
A. Have one less amino acid

Explanation
The changes results in a change of UUU to UAA which is a stop codon

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7.

An mRNA that has 1200 nucleotides can code for a protein of this many amino acids
- A.
  
  1200
- B.
  
  400
- C.
  
  3600
- D.
  
  None
Correct Answer
B. 400

Explanation
Each amino acid requires 3 nucleotdies (one codon)

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8.

Deleting a nucleotide will
- A.
  
  Have no affect on the amino acid sequence since a codon is 3 letters
- B.
  
  Will change all amino acids in the protein
- C.
  
  Will change amino acids that are coded 3' to the deletion
- D.
  
  Will change amino acids that are coded 5' to the deletion
Correct Answer
C. Will change amino acids that are coded 3' to the deletion

Explanation
The Ribosome will read the sequence as in the original sequence until it gets to the deleted sequence, then it will be "Out of frame" (reading different codons then in the original sequence)

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9.

The correct order of events is
- A.
  
  Transcription, translation,splicing
- B.
  
  Splicing, transcription, translation
- C.
  
  Transcription, splicing, translation
- D.
  
  Translation, Splicing, Transcription
Correct Answer
C. Transcription, splicing, translation

Explanation
The RNA is made, the introns are remove, and the mRNA is then translated to protein

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10.

This type of RNA codes for a protein
- A.
  
  TRNA
- B.
  
  MRNA
- C.
  
  RRNA
- D.
  
  No RNA codes for protein
Correct Answer
B. MRNA

Explanation
mRNA stands for "Messenger RNA" (coding)

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11.

The muscular dystrophy gene has 97 exons, therefore it has this many introns:
- A.
  
  97
- B.
  
  96
- C.
  
  98
- D.
  
  No gene can have that many introns
Correct Answer
B. 96

Explanation
There is always once less exon than intron

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Current Version
Nov 19, 2013

Quiz Edited by
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Nov 14, 2013

Quiz Created by
Adwohlwill

Molecular Biology Review

The anticodon is

The tRNA that is base pairing with the codon is in the

If the anticodon is 5'AGC3' then the codon is

If the anticodon is 5'AGC3' then the amino acid attached to the codon is (Use your codon table)

A section of DNA is 5' AAA TTT CAT 3' If this is transcribed and translated, the resulting amino acid sequence is

The DNA in the section above changes to 5' TTA TTT CAT 3' If this is transcribed and translated, the resulting amino acid sequence will be (compared to the sequence in the qeustion above) (Use your codon table) The amino acid sequence in the previous question was MET LYS PHE

An mRNA that has 1200 nucleotides can code for a protein of this many amino acids

Deleting a nucleotide will

The correct order of events is

This type of RNA codes for a protein

The muscular dystrophy gene has 97 exons, therefore it has this many introns: