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11 Cards in this Set
- Front
- Back
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In which direction is mRNA read?
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5' to 3' (the same direction as it is synthesized)
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In which direction are proteins synthesized?
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From the amino terminus to the carboxyl terminus
(N to C) |
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What is the enzyme that "charges" or adds the amino acid onto tRNA?
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Aminoacyl tRNA synthase.
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Give a general layout of tRNA; how does it encode for a certain amino acid?
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One side of the tRNA has a sequence that recognizes a codon and the other side of the tRNA carries the amino acid. This means that there is a specific tRNA for each amino acid.
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What is a codon?
What is an anticodon? |
A codon is the 3 nucleotide sequence that encodes for a particular amino acid (it is the code read by tRNA).
An anticodon is the complementary sequence of 3 nucleotides that match the codons on mRNA (it allows the tRNA to bind). |
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What is a wobble base?
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The wobble base is the 3rd base in a codon.
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What is the consequence of wobble bases?
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It allows faster dissociation of tRNA.
It also (less important) contributes to overall specificity of tRNA. |
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Which 5'anticodon bases are allowed to pair to mRNA codons when each of the following are in the 3'codon position?
1) C 2) A 3) U 4) G 5) I |
1) G only
2) U only 3) A or G 4) U or C 5) U, C or A |
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What makes up the majority of the mass in ribosomes?
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The RNA (not the protein).
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Where are eukaryotic ribosomes created?
Where are bacterial ribosomes created? |
In the nucleolus.
Bacteria doesn't have a nucleus; the ribosomes are created in the cytoplasm. |
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What are the 3 tRNA binding sites on a ribosome?
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A-site (aminoacyl-tRNA entry site)
P-site (peptidyl-tRNA site) [this is where amino acids are added to a peptide chain] E-site (exit site) |
