Examlex
Substances cross cell membranes by passive and active transport.
Micrometers
Units of measurement equal to one-millionth of a meter, commonly used in science to measure microorganisms or cellular structures.
Capsid
Protein coat surrounding the nucleic acid of a virus.
Envelope
A flat, usually rectangular or square paper container used for sending letters or documents, or the outer covering of a structure.
Pilus
A hair-like appendage found on the surface of many bacteria, involved in adhesion to surfaces and in bacterial conjugation.
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