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Slide 1

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Triplet code…read more

Slide 2

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Gene: a section of DNA that contains the coded information (in
the form of a specific base sequence) for making polypeptides
· There are only 20 amino acids…read more

Slide 3

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Degenerate code: some amino acids are coded for by more than
one triplet code
· Code always read in one direction
· First code always for methionine
· Code is universal; same for almost all organisms
· Non-overlapping; each base in the sequence is read once
· Contain non-coding DNA (introns)
· Start/stop codes mark the end or start of a polypeptide chain…read more

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Slide 5

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Prokaryotic vs. Eukaryotic
· P= DNA is smaller
· P= Circular DNA; E= linear DNA
· P= Not associated with proteins (no chromosomes) in prokaryotic
cells; E= associated with proteins to form chromosomes
· P= Not wound round proteins and instead condenses to fit in the
cell; E= wound round histone proteins…read more

Slide 6

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Forming of chromosomes
· DNA double helix is combined with proteins
· This complex is then coiled
· Coils form loops
· Loops then coil and pack together and form a chromosome…read more

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