Examlex
Which of the following substances can linger in the bloodstream for five hours after exposure to environmental tobacco smoke?
Photosystems
Cellular structures in chloroplasts where light energy is converted into chemical energy during photosynthesis.
Pigment
Substances that impart color to materials or organisms; in biological contexts, they absorb certain wavelengths of light and reflect others, visible to the human eye as color.
Chlorophyll
A green pigment found in the chloroplasts of plants, algae, and some bacteria, essential for photosynthesis.
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