The following diagram represents the structure of a nucleotide.
Which row of the following table correctly identifies all the components of this nucleotide?
| 1 | 2 | 3 | |
| A. | Adenine | Pentose sugar | Phosphate group |
| B. | Phosphate group | Adenine | Pentose sugar |
| C. | Pentose sugar | Phosphate group | Adenine |
| D. | Phosphate group | Pentose sugar | Adenine |
Which of the following statements only apply to RNA?
I. The molecule is in the shape of a double helix, with antiparallel strands
II. The four bases are adenine, cytosine, guanine, thymine
III. Ribose is present as the pentose sugar in its nucleotides
IV. It is a polymer formed by the linkage of many nucleotides
I and III
I, II and IV
II, III and IV
III and IV
The following diagram shows a section of a DNA molecule.
Which of these base pairs are not correct?
None
1
2
3
Which of the following is not a reason why molecular models helped Crick and Watson discover the structure of DNA?
The DNA model could be adapted as their research delivered more information
It reduced the amount of time spent on "trial and error" cycles and enabled them to come to a faster conclusion
It represented their concepts of the three dimensional structure of DNA in order for further testing
It enabled Crick and Watson to communicate their findings about the structure of DNA in a clear, visible way
The diagram shows the outcomes from four different models of DNA replication after one nuclear division. The parent DNA is shown in black and the newly synthesised DNA is shown in grey.
Which diagram represents semi-conservative DNA replication?
1
2
3
4
