BI-1525
Mutations
Biology · Secondary 4 · Hard · Mutations
Galactosaemia is caused by a mutation in a gene coding for an enzyme that converts galactose to glucose. Which statement best explains how this mutation can lead to disease?
- The mutation changes the base sequence so the enzyme’s active site no longer fits galactose.
- The mutation always increases the number of enzymes produced in the liver.
- The mutation removes all genes for carbohydrate‑digesting enzymes.
- The mutation only affects red blood cells and not the liver cells.
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