DNA & Molecular Biology Quiz
A quiz for SBI4U Biology, covering DNA structure, replication, transcription & translation.
- 1.DNA nucleotides have three components. Which one of these is NOT part of a DNA nucleotide?
- A.
Phosphate
- B.
Deoxyribose sugar
- C.
Ribose sugar
- D.
A nitrogenous base
- 2.When considering DNA replication, the best way to describe it is:
- A.
Semiconservative (half old, half new)
- B.
Conservative (original remains, a new one is formed)
- C.
Semipermeable (letting some molecules through)
- 3.In DNA replication, the enzyme responsible for untwisting & 'unzipping' the DNA strands is....
- A.
Helicase & gyrase
- B.
Ligase
- C.
DNA Polymerase III
- D.
Primase
- E.
RNAse H (DNA Polymerase I)
- 4.During DNA Replication, a short segment of RNA must form before DNA synthesis can begin. This is done by which enzyme?
- A.
Helicase & gyrase
- B.
DNA Polymerase III
- C.
Ligase
- D.
RNAse H (DNA Polymerase I)
- E.
Primase
- 5.Small discontinuous fragments of DNA, called Okazaki Fragments, need to be joined together to form a complete strand. Which enzyme carries out this reaction?
- A.
Helicase & gyrase
- B.
DNA Polymerase III
- C.
Ligase
- D.
RNAse H (DNA Polymerase I)
- E.
Primase
- 6.A new strand of DNA forms when nucleotides are linked together by phosphodiester bonds. The enzyme that enables this is...
- A.
Helicase & gyrase
- B.
DNA Polymerase III
- C.
Ligase
- D.
RNAse H (DNA Polymerase I)
- E.
Primase
- 7.During DNA replication, there are two other proteins involved that aren't enzymes. These are the SSB's and the "sliding clamp" protein. What are their jobs?
- A.
To speed up the copying of DNA & make sure it happens correctly
- B.
To prevent annealing (closing) of 'unzipped' DNA + increase processivity
- C.
To ensure that any errors in copying are excised before they become permanent
- D.
To bring the correct nucleotides to their correct complementary partners
- 8.During DNA Transcription, only one strand is copied. This strand is the 3' -- 5' strand, and is called the _______________ strand.
- A.
Leading
- B.
Lagging
- C.
Template
- 9.During DNA replication, one strand is copied in a nice, smooth, continuous manner. This strand is called the ______________ strand.
- A.
Leading
- B.
Lagging
- C.
Template
- 10.During DNA replication, one strand is made discontinously, in short fragments, little by little. This is called the ____________________ strand.
- A.
Leading
- B.
Lagging
- C.
Template
- 11.During transcription, a segment of DNA coding AACGGATTATAT would be transcribed to....
- A.
TTGCCTAATATA
- B.
AACGGATTATAT
- C.
AACGGAUUAUAU
- D.
UUGCCUAAUAUA
- 12.Although there are only 20 amino acids, there are 64 possible codons in the Genetic Code. This is because of a property of the code called....
- A.
Redundancy
- B.
Repetitiveness
- C.
Recombination
- 13.Because the mRNA codon, AUG, stands for an amino acid, it means that technically, every protein begins with which amino acid?
- A.
Isoleucine
- B.
Proline
- C.
Methionine
- D.
Tryptophan
- 14.A sequence of DNA codes: AAAAAAAAAAAAAAAAAAAAA After transcription and translation, it would yield which of the following?
- A.
Nothing.... that's ridiculous!
- B.
A polypeptide composed of 7 Lysines
- C.
A polypeptid composed of 7 Phenylalanines
- 15.Where in the cell does transcription of DNA occur?
- A.
The nucleus
- B.
The cytoplasm
- C.
Anywhere there is a ribosome
- 16.Where in the cell does translation of mRNA happen?
- A.
The nucleus
- B.
The cytoplasm
- C.
Anywhere there is a ribosome
- 17.If an mRNA has a codon which is CGC, then the tRNA anticodon will be...
- A.
CGC
- B.
GCG
- C.
UAU
- D.
ATA
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