living things consist of cells.

all living things consist of cells.

cells cannot be seen with the naked eye, therefor we use microscopes to view them.

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  • Created by: mariam
  • Created on: 15-10-11 12:03

development of cell theory.

in 1660s a compound microscope was developed by robert hooke. (not the captain hooke of petar pan) 

he then examined --> slices of cork from under the bark of an oak tree.

he found out that they were made of lots of tiny chambers just like the cells monks lived in. 

so he decided to call them cells.

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all living things consist of cells.

later, other scientists found out that all plant + animal materials were made up of cells.

1840s--> cell theory developed by 2 scientists schleiden & schwann--> was accepted.

* all living things have --> cells.

* pre-existing cell divide --> new cells formed.

* information in cells --> instructions for growth --> can be passed to new cells.

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investigating cell make-up

* cells -->very small.

* to investigate cells-->view--> images--> enlarged + more detailed.past 60 years --> light microscope--> improved --> electron microscopes developed.

electron microscopes-->cells in more detail.

structure of cell parts--> allows them to carry out their--> function.

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magnification and resolution.

magnification--> degree to which-->size of an image is larger than the object itself. 

numerically-->image size divided by actual size, measured using same units. usually expressed as--> x10, x1.5, etc.

resolution--> ability to see-->2 distinguished points--> separate.higher resolution--> greater detail seen.

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