Molecular Biology Review

Question 1 / 11

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1. The anticodon is

On the mRNA

On the tRNA

On the DNA

On the protein

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

Explanation

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

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2. This type of RNA codes for a protein

TRNA

MRNA

RRNA

No RNA codes for protein

mRNA stands for "Messenger RNA" (coding)

Explanation

mRNA stands for "Messenger RNA" (coding)

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

1200

400

3600

None

Each amino acid requires 3 nucleotdies (one codon)

Explanation

Each amino acid requires 3 nucleotdies (one codon)

4. The correct order of events is

Transcription, translation,splicing

Splicing, transcription, translation

Transcription, splicing, translation

Translation, Splicing, Transcription

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

Explanation

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

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

A site

P site

E site

None of the above

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

Explanation

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

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

LYS PHE HIS

PHE LYS VAL

MET LYS PHE

MET PHE LYS

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

Explanation

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

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

Cys

Gly

Ala

A stop codon

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

Explanation

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

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

5'UCG3'

5'TGC3'

5'AGC3'

5'GCU3'

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

Explanation

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

9. Deleting a nucleotide will

Have no affect on the amino acid sequence since a codon is 3 letters

Will change all amino acids in the protein

Will change amino acids that are coded 3' to the deletion

Will change amino acids that are coded 5' to the deletion

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)

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)

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

No gene can have that many introns

There is always once less exon than intron

Explanation

There is always once less exon than intron

11. 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

Have one less amino acid

Have one more amino acid

Have the same number of amino acids,but one will be different

The amino acids will not change at all

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

Explanation

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

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Current Version
Nov 19, 2013

Quiz Edited by
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Nov 14, 2013

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