Gene Mutations (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which amino acids are encoded by only a single triplet codon?
Which amino acids are encoded by only a single triplet codon?
Methionine and tryptophan
What is a silent mutation?
What is a silent mutation?
Substitution where new codon codes for same AA
When does insertion or deletion NOT cause a frameshift?
When does insertion or deletion NOT cause a frameshift?
When 3 bases or multiples of 3 are affected
In sickle cell anaemia, which amino acid replaces glutamic acid in β-globin?
In sickle cell anaemia, which amino acid replaces glutamic acid in β-globin?
Valine
How many CAG repeats typically cause Huntington's disease to manifest?
How many CAG repeats typically cause Huntington's disease to manifest?
More than 36
Why is pale skin advantageous in temperate regions with low UV?
Why is pale skin advantageous in temperate regions with low UV?
More efficient vitamin D synthesis
In 70% of cystic fibrosis cases, which amino acid is deleted at position 508?
In 70% of cystic fibrosis cases, which amino acid is deleted at position 508?
Phenylalanine
What happens when a proto-oncogene mutates into an oncogene?
What happens when a proto-oncogene mutates into an oncogene?
Unregulated cell division occurs
How many copies of a tumour suppressor gene must be lost for tumours to develop?
How many copies of a tumour suppressor gene must be lost for tumours to develop?
Both copies
Which gene controls the ability to taste PTC (phenylthiocarbamide)?
Which gene controls the ability to taste PTC (phenylthiocarbamide)?
TAS2R38