Topic 7 - Nucleic acids (HL)
Question 1
HLPaper 1The number of protein-coding genes in the human genome is estimated to be about 20 000, which is much less than the size of the proteome. What is one reason for this?
Question 2
HLPaper 1In the diagram of a ribosome, which letter indicates the P site?
Question 3
HLPaper 1Which cell component synthesizes actin and myosin?
Question 4
HLPaper 2The figure shows a tripeptide.
Label one peptide bond in this molecule.
Describe the secondary structure of proteins.
Outline the action taken by the diaphragm during inhalation.
Question 5
HLPaper 2Proteins are an important group of chemicals found in all living organisms.
Draw a molecular diagram to show the formation of a peptide bond.
Outline how proteins are digested and the products of protein digestion absorbed in humans.
Explain how polypeptides are produced by the process of translation.
Question 6
HLPaper 2State one role of nucleosomes in eukaryotic cells.
Outline how Hershey and Chase’s experiment provided evidence for DNA as the genetic material.
State one function for a region of DNA that does not code for proteins.
Outline the role of the A-site of ribosomesin translation.
Outline the role of tRNA activating enzymes in translation.
Question 7
HLPaper 1Gene expression in cells is regulated at various stages. During which stage does splicing of RNA occur?
Question 8
HLPaper 1Which are two proteins that assist in the unwinding and separation of DNA strands during replication?
Question 9
HLPaper 1What applies to DNA base sequences?
I. Some genes do not code for proteins.
II. Promoters are transcribed along with the gene.
III. Introns are only found within genes coding for proteins.
Question 10
HLPaper 1The diagram shows the three-dimensional structure of tRNA.
What can attach to the region marked X?
A. mRNA
B. An amino acid
C. An anticodon
D. The P site of the ribosome
