The pathogen that causes cholera is a prokaryote. The passage contains a description of the main features of prokaryotic cells. There is one factual error in the passage. Prokaryotic cells are unicellular and generally between $$$1 \mu \mathrm{m}$$$ and $$$5 \mu \mathrm{m}$$$ in diameter. Prokaryotes do not have organelles surrounded by double membranes. They do have cell surface membranes, 70 S ribosomes and a cellulose cell wall. The DNA of a prokaryotic cell is circular and is found free in the cytoplasm rather than enclosed in a nuclear envelope. Identify and correct the factual error in the passage. ............................................................................................................................................... . .........................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_m24_qp_22 Year：2024 Question No：5(b)

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Knowledge points:

10.1.1 state that infectious diseases are caused by pathogens and are transmissible

10.1.2.1 cholera – caused by the bacterium Vibrio cholerae

10.1.2.2 malaria – caused by the protoctists Plasmodium falciparum, Plasmodium malariae, Plasmodium ovale and Plasmodium vivax

10.1.2.3 tuberculosis (TB) – caused by the bacteria Mycobacterium tuberculosis and Mycobacterium bovis

10.1.2.4 HIV/AIDS – caused by the human immunodeficiency virus (HIV)

10.1.3 explain how cholera, malaria, TB and HIV are transmitted

10.1.4 discuss the biological, social and economic factors that need to be considered in the prevention and control of cholera, malaria, TB and HIV (details of the life cycle of the malarial parasite are not expected)

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Knowledge points:

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