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Discovery of the Cell

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Questions and Answers

What was the initial observation made by Robert Hooke regarding cork?

Cork contains only one type of cell.

Cork has a honey-comb like structure. (correct)

Cork cells were large and visible to the naked eye.

Cork is made up of living cells.

How do unicellular and multicellular organisms differ?

Multicellular organisms are always larger than unicellular organisms.

Multicellular organisms consist of only one cell.

Unicellular organisms consist of a single cell. (correct)

Unicellular organisms have more than one type of cell.

What primarily contributed to the discovery of cells in the seventeenth century?

Expedition by scientists to study human anatomy.

Introduction of electron microscopy.

Improvement in genetic engineering techniques.

Development of advanced optical instruments. (correct)

What composition is found in the outermost layer of human skin?

<p>Dead cells that are shed and replaced.</p> Signup and view all the answers

Which statement accurately describes the significance of Robert Hooke's work?

<p>He coined the term 'cell' based on his observation of cork.</p> Signup and view all the answers

Study Notes

Discovery of the Cell

Cells are the basic structural units of all living things
Cells were too small to be seen with the naked eye for a long time
Optical instruments allowed for the discovery of cells in the 17th century
Robert Hooke, in 1665, observed cork cells using a microscope
Hooke observed a honey-comb like structure in cork, consisting of smaller compartments
These compartments were later called "cells" (Latin for "a little room")

The Cell

Living organisms are composed of cells
Cells have similar basic structures but differ in number, shape, and size
Skin cells are constantly being replaced, with roughly four kilograms of skin cells lost per year

Variation in Cell Number, Shape, and Size

Organisms vary significantly in size due to the number of cells
Amoeba is a single-celled organism
Earthworms have millions of cells
Organisms are categorized as unicellular (single cell) or multicellular (many cells) based on cell number

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Description

Explore the fascinating history and structure of cells, the fundamental units of life. Learn about how optical instruments led to their discovery and the differences in cell types across various organisms. This quiz covers the contributions of scientists like Robert Hooke and the significance of cell variation.