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Which list shows pathogens in order of increasing size? (A) Bacterium, prion, virus, protozoan, macroparasite (B) Macroparasite, prion, protozoan, bacterium, virus (C) Prion, virus, bacterium, protozoan, macroparasite (D) Virus, prion, bacterium, macroparasite, protozoan - HSC - SSCE Biology - Question 9 - 2011 - Paper 1
Question 9
Which list shows pathogens in order of increasing size? (A) Bacterium, prion, virus, protozoan, macroparasite (B) Macroparasite, prion, protozoan, bacterium, vir... show full transcript
Worked Solution & Example Answer:Which list shows pathogens in order of increasing size? (A) Bacterium, prion, virus, protozoan, macroparasite (B) Macroparasite, prion, protozoan, bacterium, virus (C) Prion, virus, bacterium, protozoan, macroparasite (D) Virus, prion, bacterium, macroparasite, protozoan - HSC - SSCE Biology - Question 9 - 2011 - Paper 1
Step 1
Which list shows pathogens in order of increasing size?
Answer
To determine the correct order of pathogens by increasing size, we should first understand the relative sizes of each type of pathogen:
- Prion: This is the smallest, consisting of misfolded proteins.
- Virus: Slightly larger than prions, viruses are generally measured in nanometers.
- Bacterium: Bacteria are larger than viruses and are typically measured in micrometers.
- Protozoan: Protozoans are single-celled organisms larger than bacteria, usually also measured in micrometers but tend to be more complex.
- Macroparasite: These are the largest pathogens, which include multicellular organisms like worms.
Therefore, when we compare the choices:
- (A) Bacterium, prion, virus, protozoan, macroparasite (Incorrect, wrong order)
- (B) Macroparasite, prion, protozoan, bacterium, virus (Incorrect, wrong order)
- (C) Prion, virus, bacterium, protozoan, macroparasite (Correct order)
- (D) Virus, prion, bacterium, macroparasite, protozoan (Incorrect, wrong order)
The correct answer is (C) Prion, virus, bacterium, protozoan, macroparasite.