A Tour of the Cell

From the study guide

Course Outline

  1. Cell Principles and Microscopy
  2. Cell Fractionation and Cell Types
  3. Nucleus and Ribosomes
  4. The Endomembrane System
  5. Mitochondria, Chloroplasts, and Peroxisomes
  6. Cytoskeleton and Cell Motility
  7. Extracellular Structures and Junctions

1. Cell Principles and Microscopy

★ Must-know

  • All organisms are made of cells, the simplest collection of matter that can live, and all cells descend from earlier cells.

📌 Magnification is the ratio of an image’s size to an object’s real size, whereas resolution is image clarity or the minimum distance at which two points remain distinguishable.

  • Light microscopes use visible light and glass lenses, can magnify effectively to about 1,000 times, and generally cannot resolve most organelles.

📌 Scanning electron microscopes image specimen surfaces with a three-dimensional appearance, whereas transmission electron microscopes pass electrons through specimens to study internal structure.

Further detail

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Practice quiz preview

1. An image is enlarged, but two nearby points still appear as one. Which interpretation best distinguishes magnification from resolution?

2. What happens to chromatin as a cell forms discrete chromosomes?

3. Which set of structures belongs to the endomembrane system, linked through membrane continuity or vesicle transfer?

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Flashcard preview

What is the simplest collection of matter that can live?

A cell.

From what do all cells descend?

Earlier cells.

What is the ratio of an image’s size to an object’s real size called?

Magnification.

What does resolution describe in microscopy?

Image clarity or the minimum distance at which two points remain distinguishable.

What kind of light do light microscopes use?

Visible light.

How do scanning electron microscopes depict specimen surfaces?

With a three-dimensional appearance.

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Frequently asked questions

What does the A Tour of the Cell study guide cover?

It covers the core concepts of A Tour of the Cell, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.

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How many questions are in the A Tour of the Cell quiz?

The practice quiz has 26 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.

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How do I study A Tour of the Cell with flashcards?

There are 56 flashcards on A Tour of the Cell, with a question on the front and the answer on the back. Try to recall each answer before you flip, and let spaced repetition bring back the ones you miss.

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