Lesson 2.1.3b
2.1.3b DNA replication, genetic code and protein synthesis Quiz: OCR Biology, Unit 1
20 questions
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Lesson 2.1.3b, DNA replication, genetic code and protein synthesis: 20 multiple choice questions for the OCR Biology (H020), Unit 1: Foundations in biology, written with Revision Ninja.
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The 20 questions
-
What is the strand composition after semi-conservative replication?
- Fragmented old and new
- Two entirely new
- Two entirely old
- One old, one new
-
Which enzyme unwinds the DNA double helix during replication?
- RNA polymerase
- DNA ligase
- Helicase
- DNA polymerase
-
Which enzyme adds new nucleotides to the growing DNA strand?
- DNA polymerase
- Helicase
- Ribosome
- Restriction enzyme
-
How many bases make up a single codon in the genetic code?
- Two
- Four
- Three
- One
-
What term describes multiple codons coding for the same amino acid?
- Degenerate
- Triplet
- Non-overlapping
- Universal
-
Which molecule carries an amino acid to the ribosome during translation?
- mRNA
- tRNA
- Helicase
- rRNA
-
Transcription produces which molecule?
- mRNA
- tRNA
- rRNA
- DNA
-
A DNA template strand reads 3'-TAC-5'. What is the sequence of the mRNA codon produced from it?
- 5'-UAC-3'
- 5'-AUG-3'
- 3'-AUG-5'
- 5'-ATG-3'
-
Which codon is the start codon for translation?
- UGA
- AUG
- UAG
- UAA
-
A coding sequence of 30 bases (excluding any stop codon) is translated. How many amino acids are specified?
- 3
- 10
- 30
- 90
-
Which enzyme catalyses the synthesis of mRNA from a DNA template?
- RNA polymerase
- DNA ligase
- DNA polymerase
- Helicase
-
During translation, a tRNA anticodon of UAC pairs with which mRNA codon?
- CAU
- AUG
- UAC
- GUA
-
Which RNA forms the structural core of ribosomes?
- rRNA
- snRNA
- mRNA
- tRNA
-
In which direction does RNA polymerase build the mRNA strand during transcription?
- Both directions
- 5' to 3'
- N-terminus to C-terminus
- 3' to 5'
-
Which genetic code property prevents a base change from altering the amino acid?
- Universality
- Non-overlapping
- Triplets
- Degeneracy
-
What ensures accurate copying of DNA during semi-conservative replication?
- Random base insertion
- Phosphodiester bonding
- Complementary base pairing
- Hydrogen bond formation
-
Why are many spontaneous mutations in DNA not harmful?
- Telomere capping
- Degenerate code
- Histone protection
- Enzyme repair
-
What is the primary structural effect of a 3-base insertion in a coding region?
- A frameshift mutation
- One extra amino acid
- A premature stop codon
- One missing amino acid
-
A gene encodes a polypeptide of 150 amino acids. What is the minimum number of bases in its coding sequence, excluding the stop codon?
- 150
- 450
- 300
- 600
-
Where does transcription take place in eukaryotic cells?
- Nucleus
- Golgi apparatus
- Cytoplasm
- Ribosome
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