[Maximum number: 1]
Which types of RNA are present in prokaryotic cells and in eukaryotic cells?
mRNA
rRNA
tRNA
x
x
x
x
key
✓ = present
x= not present
(a)
Fig. 3.1 is a diagram of a monomer of the nucleic acid, messenger RNA.
Fig. 3.1
[ 1 ]
(i)
State one way in which the structure of DNA differs from the structure of messenger RNA.
[ 1 ]
(a)
Fig. 4.1 shows part of a DNA molecule.
Fig. 4.1
Use Fig. 4.1 to explain how the structure of mRNA differs from the structure of DNA.
[Maximum number: 1]
Which statement about messenger RNA is correct?
A
In eukaryotic cells, mRNA is made by removing exons from the primary RNA transcript.
B
mRNA is a single-stranded polynucleotide containing a different purine base than DNA.
C
mRNA molecules contain ribose sugars joined to phosphate groups by phosphodiester bonds.
D
The monomers of mRNA contain a phosphate group, deoxyribose sugar and a nitrogenous base.
[Maximum number: 1]
Which statement about mRNA is correct?
A
It is a polymer made of nucleotides all joined with hydrogen bonds.
B
Each nucleotide subunit contains the sugar ribose.
C
It always has an equal proportion of adenine and uracil.
D
The mRNA sequence is identical to the template strand of DNA.