21. Which of the following are responsible for causing the diseases?

A. Pathogens
B. T cells
C. Lymphocytes
D. Macrophages

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22. In which of the following cell types more cellular detail can be observed using an electron microscope compared to a light microscope?

A. Animal
B. Bacterial
C. Protist
D. All of these

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23. Which of the following is present in both prokaryotes and eukaryotes?

A. Lysosome
B. Chloroplast
C. Plasma membrane
D. Vacuole

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