Lesson 2.2.2
2.2.2 Transcription, translation, the genetic code and genes Quiz: Pearson Edexcel Biology, Unit 2
20 questions
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Lesson 2.2.2, Transcription, translation, the genetic code and genes: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 2: Genes and Health, written with Revision Ninja.
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The 20 questions
-
Which enzyme catalyses the synthesis of messenger RNA during transcription?
- RNA polymerase
- Peptidyl transferase
- DNA polymerase
- Helicase
-
Which DNA strand acts as the template during transcription?
- Lagging strand
- Coding strand
- Antisense strand
- Sense strand
-
Which base is found in mRNA but not in DNA?
- Uracil
- Guanine
- Thymine
- Adenine
-
What is the codon for the start of translation?
- UGA
- UAA
- UAG
- AUG
-
Which of these is a stop codon?
- UAG
- CUU
- GGC
- AUG
-
What is the anticodon on a tRNA molecule that is complementary to the codon AUG?
- GUA
- UAC
- TAC
- AUG
-
How many bases make up a single codon in the genetic code?
- Six
- Three
- Four
- Two
-
What term describes a genetic code where each base is part of only one codon?
- Degenerate
- Universal
- Continuous
- Non-overlapping
-
What feature of the genetic code allows multiple codons to code for one amino acid?
- Degeneracy
- Universality
- Non-overlapping
- Specificity
-
How many possible codons are there with four different bases read in triplets?
- 16
- 20
- 32
- 64
-
A DNA template strand has the sequence 3'-TACGGC-5'. What is the sequence of the mRNA produced by transcription, written 5' to 3'?
- 5'-ATGCCG-3'
- 5'-GCCGUA-3'
- 5'-AUGCCG-3'
- 5'-TACGGC-3'
-
A polypeptide has 100 amino acids. What is the minimum number of nucleotides in the coding sequence of its mRNA, excluding the stop codon?
- 200
- 400
- 100
- 300
-
Which type of bond is catalysed by ribosomes during translation?
- Glycosidic bond
- Phosphodiester bond
- Peptide bond
- Ester bond
-
Which region of a tRNA molecule binds to a complementary codon on mRNA?
- Anticodon
- Promoter
- Amino acid site
- Codon
-
What is a sequence of DNA bases that codes for a polypeptide called?
- Codon
- Gene
- Intron
- Genome
-
Why might a point mutation changing GAA to GAG have no effect on a protein?
- Code is universal
- Code is degenerate
- Code is overlapping
- DNA is single-stranded
-
What happens to translation if a mutation creates a stop codon early in mRNA?
- Terminates early
- Doubles in speed
- Continues uninterrupted
- Reverses direction
-
Which process uses a DNA template strand to synthesise an mRNA molecule?
- Transcription
- Translation
- Replication
- Translocation
-
Which specific mRNA codon sequence marks the beginning of translation?
- Start codon
- Promoter
- Anticodon
- Stop codon
-
Which property describes how the same codons specify the same amino acids in nearly all species?
- Non-overlapping
- Universality
- Degeneracy
- Redundancy
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