Nucleic acids - questions and answers

1) Describe the differences between the structure of DNA and RNA.

ii) a sample of DNA was analysed, 23% of the nucleotides contained guanine. Calculate the percentage of nucleotides which contained adenine. Show your working.

ii) Name component A.

iii) Name component B for DNA and RNA.

iv) Name the four components in DNA, represented by C.

v) Describe how the structural units, drawn in part (a), are arranged in DNA molecules.

vi) Describe the function of DNA molecules in cells

3) Compare DNA and mRNA. Name of sugar, number of carbon atoms in sugar, number of polynucleotide chains in molecule and location in cell.

ii) Explain why the base sequence of the DNA samples taken from a rat's bone marrow would be the same as those taken from the muscle of the same rat.

iii) Explain how a sample of DNA from a rat's sperm differs from that of a muscle cell from the same rat.

4) What is meant by the term semi-conservative replication?

ii) If they wanted to show the relative position of DNA from different sample of bacteria, suggest two variables that would need to be controlled in the centrifugation process.

iv) What would you expect to see in tubes C and D.

5) What is the role of messenger RNA and ribosomes in protein synthesis?

6) What is the difference between transcription and translation?

7) What is the name of an RNA sequence that codifies one amino acid?

8) If a tRNA anticodon is CAA, what is its corresponding mRNA codon?

That's the end of the questions.
Well done!
Check the back of this card for a quick reminder about DNA and RNA.