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  • Created by: Leona-L
  • Created on: 11-11-15 20:05
Describe the role of mRNA in protein synthesis.
Transcribes gene from DNA, takes it to the ribosome.
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Describe the role of tRNA in protein synthesis
Brings amino acid to ribosome
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Describe the role of rRNA in protein synthesis.
Composes ribosome
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An enzyme forms part of a ribosome. Suggest why.
The enzyme catalyses the formation of peptide bonds between amino acids
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rRNA also forms part of the ribosome. Suggest why RNA is needed in a ribosome.
It allows the ribosome to bind to tRNA through complementary base pairing.
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Why are ribosomes found in both the rough ER and in the cytoplasm?
Free floating ribosomes synthesise proteins for use in the cell, while ribosomes bound to the rough endoplasmic reticulum synthesise proteins for export.
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Before it leaves the nucleus, transcribed mRNA is modified; introns (non-coding sections of DNA) are removed and each end is 'capped'to prevent degradation in the cytoplasm.Explain why introns must be removed.
The structure of a protein determines its function/codons code for aa/primary structure = altered 3D structure/unnecessary or stop/frameshift caused
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Why might introns be present within genes?
They could be mutations/the sequence of an originally functional gene has changed
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Other cards in this set

Card 2

Front

Describe the role of tRNA in protein synthesis

Back

Brings amino acid to ribosome

Card 3

Front

Describe the role of rRNA in protein synthesis.

Back

Preview of the front of card 3

Card 4

Front

An enzyme forms part of a ribosome. Suggest why.

Back

Preview of the front of card 4

Card 5

Front

rRNA also forms part of the ribosome. Suggest why RNA is needed in a ribosome.

Back

Preview of the front of card 5
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