5-Bromouracil (bU) is a synthetic chemical mutagen. It bonds with adenine in place of thymine in DNA. During replication, it then binds with guanine. This will then make a guanine-cytosine pair on one strand of DNA instead of an adenine-thymine pair. --- 2 WORK AREA LINES (style=lined) --- --- 8 WORK AREA LINES (style=lined) ---
BIOLOGY, M5 2023 HSC 11 MC
BIOLOGY, M5 2014 HSC 32a
- Name the process for the synthesis of a polypeptide chain from a messenger-RNA base sequence. (1 mark)
--- 2 WORK AREA LINES (style=lined) ---
- Outline the steps in the formation of a functional enzyme from polypeptide chains. (3 marks)
--- 6 WORK AREA LINES (style=lined) ---
BIOLOGY, M5 2018 HSC 26a
Compare proteins and polypeptides. (2 marks)
BIOLOGY, M5 2020 HSC 32b
The rabies virus is a single-stranded RNA virus. It contains and codes for only five proteins. The diagrams show the structure and reproduction of the virus.
- Use the information provided in Diagram 1 to explain why the rabies virus cannot be classified as a cellular pathogen. (3 marks)
--- 5 WORK AREA LINES (style=lined) ---
- After infection the virus reproduces in muscle cells near the bite site and in the central nervous system. This requires the single-stranded rabies RNA to be transcribed, translated and replicated in the cytoplasm of host cells. These processes are shown in Diagram 2.
- Use the information provided in Diagrams 1 and 2 to explain the role of viral RNA polymerase in the reproduction of the virus. (5 marks)
--- 12 WORK AREA LINES (style=lined) ---