WorksheetsS16T5/S16T11 Quiz 6 Expression of Biological Information
Total questions: 15
Worksheet time: 7mins
Why DNA is able to store large amounts of genetic information?
Its contains a large number of nucleotides.
The sugar and phosphates can be arranged in many different sequences.
Its nucleotides can be arranged in large number of possible sequences.
The nitrogen bases can be altered to form many different letters in the sequence.
Which of the following numbered terms represents the correct order of sequences in a eukaryotic DNA as it was synthesized?
1. Okazaki fragments are joined together.
2. Formation of RNA primer.
3. Unwind the DNA strand.
4. Formation of leading and lagging strands.
1, 2, 3 then 4
3, 2, 4 then 1
2, 1, 4 then 3
4, 2, 1 then 3
Each DNA strand has a backbone consisting of alternating
purines and pyrimidines.
nitrogen-containing bases.
hydrogen bonds.
sugar and phosphates.
The sentences below are true about transcription EXCEPT
it occurs in the nucleus.
it is the first process in the synthesis of protein.
it occurs in the synthesis of any type of RNA from a DNA template.
it is catalyzed by DNA polymerase.
Which of the following is NOT true of an anti-codon?
It consists of three nucleotides.
It is the basic unit of the genetic code.
It will pair with specific codon.
Its base uracil base-pairs with adenine.
What is the molecule which acts as an intermediate between the DNA and the ribosomes?
Messenger RNA
Transfer RNA
Ribosomal RNA
Intermediate RNA
If a DNA strand reads 3’ TAC GGC ATG 5’, then the RNA molecules created by transcription would read
5’ ATG CCG TAC 3’
5’ CGU AAU GCA 3’
5’ CGT AAT GCA 3’
5’ AUG CCG UAC 3’
Which of the following is NOT true about the lac operon in the presence of lactose?
A small quantity of lactose will be converted into allolactose.
The repressor protein is inactive.
Transcription of the lac genes, lacZ, lacY and lacA occurs.
RNA polymerase cannot bind to the promoter.
A promoter is
a substance which facilitates RNA transcription.
a sequence of bases at which RNA polymerase begins transcription.
a type of RNA which promotes cell division.
an environmental change which causes transcription occur.
One of the mRNA codons specifying the amino acid leucine is 5’ CUA 3’. Its corresponding anticodon is
5’ GAU 3’
3’AUG 5’
3’ GAU 5’
3’ GAT 5’
A transcription unit that is 1500 nucleotides long may use 1000 nucleotides to make a protein consisting of 300 amino acids. This is best explained by the fact that
many non-coding nucleotides are present.
nucleotides break off and are lost during transcription.
many nucleotides are needed and coded for each amino acid.
there is redundancy and ambiguity in the genetic code.
If the enzyme X is coded by 53 codons, how many amino acids are there in the polypeptide chain?
51
52
53
54
If the DNA triplets are 3’ GTT ACG 5’, the tRNA anticodons would be
3’ GTT ACG 5’
3’ ATG CGT 5’
5’ GUU ACG 3’
3’ GUU ACG 5’
Choose the answer that has these events of protein synthesis in the correct sequence.
1. An aminoacyl-tRNA binds to the A site.
2. A peptide bond forms between the new amino acid and polypeptide chain.
3. tRNA leaves the E site and A site remains vacant.
4. A small ribosomal subunit binds with mRNA.
5. Aminoacyl-tRNA translocates to the P site.
1 - 3 - 2 - 4 - 5
4 - 1 - 2 - 5 - 3
5 - 4 - 3 - 2 - 1
4 - 1 - 3 - 2 - 5
Transfer RNA
forms hydrogen bonds between its codon and the anti-codon of an mRNA.
binds to its specific amino acid in the active site of an aminoacyl-tRNA synthetase.
uses GTP as the energy source to bind its amino acid.
is transcribed in the nucleus and formed in the cytoplasm of the cell.
