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F215: Control, Genome
and the Environment
OCR Biology
Kamali

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Kamali

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F215: Control, Genome and the Environment
Module 1: Cellular Control and Variation 5.1.1: Cellular Control
(a) State that genes code for polypeptides, including enzymes
(b) Explain the meaning of the term `genetic code'
The genetic code is the sequence of base pairs on a length of DNA. It codes (contains…

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DNA to resume its double-stranded, helical structure. Translation
- The completed mRNA strand attaches to a small ribosomal subunit, and is exposed to
the larger ribosomal subunit. - A molecule of tRNA, with an anticodon
complementary to the first codon on the mRNA
strand, binds to its specific amino acid.…

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Kamali

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- A second molecule of tRNA, with an anticodon complementary to the second codon on
the mRNA strand, also binds to its specific amino acid, and also binds to the mRNA
strand. - Ribosomal enzymes cause a peptide bond to form between the two amino
acids. - The first tRNA…

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inducer, causing the molecular switch to be turned on, and the necessary enzymes ­
-galactosidase and lactose permease ­ to be synthesised. Here's how:
Lactose NOT present
The regulator gene is expressed and synthesises the lac repressor, which has two
binding sites (one for binding to the operator region, and…

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Kamali
Lactose present
Lactose is taken up by the bacterium, and then binds to the lac repressor, causing it to
change shape. This shape change causes the repressor protein to dissociate from the
operator region, which allows RNA polymerase to bind to the promoter region, and
hence transcribe the structural…

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
F215: Control, Genome
and the Environment
OCR Biology
Kamali

Page 3

Preview of page 3
Kamali

Page 4

Preview of page 4
F215: Control, Genome and the Environment
Module 1: Cellular Control and Variation 5.1.1: Cellular Control
(a) State that genes code for polypeptides, including enzymes
(b) Explain the meaning of the term `genetic code'
The genetic code is the sequence of base pairs on a length of DNA. It codes (contains…

Page 5

Preview of page 5
DNA to resume its double-stranded, helical structure. Translation
- The completed mRNA strand attaches to a small ribosomal subunit, and is exposed to
the larger ribosomal subunit. - A molecule of tRNA, with an anticodon
complementary to the first codon on the mRNA
strand, binds to its specific amino acid.…

Page 6

Preview of page 6
Kamali

Page 7

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- A second molecule of tRNA, with an anticodon complementary to the second codon on
the mRNA strand, also binds to its specific amino acid, and also binds to the mRNA
strand. - Ribosomal enzymes cause a peptide bond to form between the two amino
acids. - The first tRNA…

Page 8

Preview of page 8
inducer, causing the molecular switch to be turned on, and the necessary enzymes ­
-galactosidase and lactose permease ­ to be synthesised. Here's how:
Lactose NOT present
The regulator gene is expressed and synthesises the lac repressor, which has two
binding sites (one for binding to the operator region, and…

Page 9

Preview of page 9

Page 10

Preview of page 10
Kamali
Lactose present
Lactose is taken up by the bacterium, and then binds to the lac repressor, causing it to
change shape. This shape change causes the repressor protein to dissociate from the
operator region, which allows RNA polymerase to bind to the promoter region, and
hence transcribe the structural…

Comments

No comments have yet been made