Prokaryotic cells (article) | Khan Academy
Universal features of cells. Characteristics of prokaryotic cells. Surface area-to-volume ratio.
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Review the basic structures of cells and their functions on Khan Academy.
Prokaryotic cells - Khan Academy
Most bacteria are, however, surrounded by a rigid cell wall made out of peptidoglycan, a polymer composed of linked carbohydrates and small proteins. The cell wall provides an extra layer of …
Intro to viruses (article) | Viruses | Khan Academy
The structure of a virus and how it infects a cell. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
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Review of eukaryotic cell structures, including the nucleus, endoplasmic reticulum, Golgi body, mitochondria, chloroplasts, and vacuoles.
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Learn the basics of microscopy and how it is used to study cells and their structures.
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For example, plant cells contain chloroplasts since they need to perform photosynthesis, but animal cells do not. Diagram of a typical animal cell: Image modified from OpenStax Biology.
Classic experiments: DNA as the genetic material - Khan Academy
Hershey and Chase knew that the phages attached to the surface of a host bacterial cell and injected some substance (either DNA or protein) into the host. This substance gave …