WorksheetsDNA replication
Total questions: 22
Worksheet time: 8mins
Which of the following describes the difference between a prokaryote mRNA and eukaryote mRNA?
Prokaryotes have longer mRNA strands due to presence of introns
Eukaryotes have longer mRNA strands due to the presence of introns
Prokaryotes modify the mRNA due to the presence of a nuclear envelope
Eukaryotes modify the mRNA due to the absence of a nuclear envelope
Which of the following is the function of the poly-A tail?
To protect mRNA from hydrolytic enzymes
To allow for exit from nucleus
To signal for termination of translation
To decrease the length of mRNA molecules
In the absence of which factor or enzyme, the transcription starts non-specifically (hypothetically) at any base of DNA ?
Rho ( ρ ) factor
Core enzyme
Sigma ( σ ) factor
None of the above
Which of the following sequences of RNA will be transcribed from a hypothetical sequence of DNA given below?
3'-ATGCATGCATGCATGC-5'
5'-TACGTACGTACGTACG-3'
3'-UACGUACGUACGUACG-5'
5'-AUGCAUGCAUGCAUGC-3'
5'-UACGUACGUACGUACG-3'
3'-AUGCAUGCAUGCAUGC-3'
Which of the following is a wrong match?
Rho factor - Terminates translation
Template strand – Has same sequence as of mRNA
Sigma factor - Initiates translation
All of these
Name the enzyme that facilitates opening of DNA helix during transcription.
DNA polymerase
RNA polymerase
DNA ligase
DNA helicase
RNA must be edited before it can be used to make Proteins, what happens during this editing process?
A spliceosome cuts out exons, reconnects the introns
A spliceosome cuts out the introns, reconnects the exons
A splicesome pairs nucleotides with the DNA base pairs
The RNA is checked for typos
What enzyme does transcription use?
DNA polymerase
ligase
RNA polymerase
helicase
RNA polymerase reads the mRNA strand in which direction?
3' to 5' direction
5' to 3' direction
What type of RNA moves to the ribosome to start protein synthesis?
tRNA
mRNA
rRNA
nRNA
Many enzymes are involved in DNA replication. Which is the correct order of enzymes involved in DNA replication from beginning to end?
Helicase, DNA primase, DNA polymerase, Ligase
RNA primase, Helicase, DNA polymerase, Ligase
Helicase, RNA primase, DNA polymerase, Ligase
DNA primase, Helicase, RNA polymerase, Ligase
Which shows the correct complementary DNA strand of ATG?
ATG
TAC
TAG
CGC
DNA polymerase
Ligase
Primase
Helicase
Which letter in the picture below depicts the leading strand in DNA replication?
A
C
B
None of the above
Which is the second step?
DNA Helicase unwinds original DNA strand
RNA Primase lays down RNA primer for new nucleotide bases.
DNA polymerase builds new strands by bring in new nucleotide bases.
Ligase knits together fragments on lagging strand
The picture below shows an enzyme unwinding and unzipping DNA.
What is the name of this enzyme?
DNA Helicase
DNA Ligase
DNA polyermase
RNA Polymerase
What is needed for DNA replication to unzip at the hydrogen bonds?
phosphates
enzymes
deoxyribose (sugar)
hydrogen
The process of DNA replication is called semi conservative because it results in
none of these
Two DNA molecules. One original molecule and one with two new strands
two exact copies with new strands
two DNA molecules, each with 1 original strand and one new.
In what phase of the cell cycle does DNA replication take place?
G1
S
G2
Prophase
