Gene expression

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What is a gene?
Genes are sections of DNA that code for proteins.
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What is the first stage of protein synthesis called?
Transcription
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What is the molecule synthesised by transcription?
mRNA
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What is the promoter region?
turns the gene on and off and signals the site of transcription.
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Where and what is the coding region?
The coding region is the base sequence for the an amino acid on the mRNA molecule.
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What is the terminator?
signals the end of transcription.
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A triplet is?
the three base nucleotide sequence that codes for and amino acid on the DNA strand.
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What does degenerate mean?
one triplet can code for more than one amino acid.
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A codon is?
the three nucleotide base sequence on the mRNA molecule that is complementary to the DNA triplet.
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What is the second stage of protein synthesis?
Translation
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Where does the two stages of protein synthesis take place?
the nucleus and the cytoplasm.
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What are the three stop codons?
UAA UAG UGA
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What is the role of the organelle that decodes the mRNA?
The ribosome forms around the mRNA for translation. It moves along the mRNA strand reading one codon at a time while the tRNA bring the amino acids into place.
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What is the bond that holds the polypeptide chain together?
Peptide bonds.
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Why is the process of protein synthesis important?
Proteins act as support and protection e.g nails, feathers, hair etc. Enzymes are essential for metabolic pathways e.g respiration and DNA replication.
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Card 2

Front

What is the first stage of protein synthesis called?

Back

Transcription

Card 3

Front

What is the molecule synthesised by transcription?

Back

Preview of the front of card 3

Card 4

Front

What is the promoter region?

Back

Preview of the front of card 4

Card 5

Front

Where and what is the coding region?

Back

Preview of the front of card 5
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