Question 2
[Maximum number: 1]
The image shows a DNA nucleotide.
Which correctly identifies the parts labelled I and II?
I
II
base
phosphate
ribose
uracil
deoxyribose
base
ribose
adenine
IB Biology SL A1.2 Nucleic acids Question Bank
A1.2 Nucleic acids
- A1.2.1—DNA as genetic material
- A1.2.2—Components of a nucleotide
- A1.2.3—Sugar-phosphate bonding
- A1.2.4—Bases form the basis of a code
- A1.2.5—RNA as a polymer
- A1.2.6—DNA as a double helix
- A1.2.7—Differences between DNA and RNA
- A1.2.8—Complementary base pairing
- A1.2.9—Diversity of DNA base sequences
- A1.2.10—Conservation of genetic code
Question 2
[Maximum number: 1]
What allows DNA to store very large amounts of data?
A
Two strands of DNA
B
Base sequence
C
Complementary base pairing
D
Sugar-phosphate backbone
Question 5
[Maximum number: 1]
Research has shown that the genetic code is not entirely universal. Which research finding has shown this?
A
Some amino acids are coded for by more than one codon.
B
There are differences between the base sequences of genes in different species.
C
In some organisms the genetic code for mitochondria differs from the genetic code for the nucleus.
D
Some codons code for the addition of an amino acid and some code for the termination of translation.
Question 6
[Maximum number: 1]
What is the arrangement of subunits in a DNA nucleotide?
A
sugar - base - phosphate
B
sugar - phosphate - base
C
phosphate - sugar - base
D
sugar - phosphate - base - base - phosphate - sugar
Question 7
[Maximum number: 1]
Which parts of this nucleotide would bond covalently with other nucleotides in a DNA double helix?
A
1 and 2 only
B
1 and 3 only
C
2 and 3 only
D
1, 2 and 3
Question 2
Question 2(c)
(a)
State two structural features that differ between RNA and DNA.
[ 2 ]
Question 8
[Maximum number: 1]
Which molecules form the nucleotide marked in the diagram?
A
phosphate, deoxyribose and nitrogenous base
B
phosphorus, ribose and nitrogenous base
C
phosphorus, deoxyribose and guanosine
D
phosphate, ribose and guanine
Question 8
[Maximum number: 1]
The diagram shows a dinucleotide.
Which type of bond is identified by the arrow?
A
Phosphate
B
Hydrogen
C
Covalent
D
Peptide
Question 9
[Maximum number: 1]
The diagram shows part of a DNA molecule.
What type of bond does X represent?
A
Covalent bond
B
Hydrogen bond
C
Peptide bond
D
Semi-conservative bond
Question 9
[Maximum number: 1]
Watson and Crick worked out the three-dimensional structure of DNA. What did the model they built show for the first time?
A
DNA is a polynucleotide.
B
DNA contains equal quantities of adenine and thymine.
C
DNA molecules have a helical shape.
D
DNA is a double helix with antiparallel sugar-phosphate backbones.