# Introduction to Cells - PowerPoint PPT Presentation

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Introduction to Cells. Topic 2:Investigating Cells Standard Grade Biology. Magnification Cells can be seen more clearly using Microscopes _________________________ the cells Microscopes may have two or three__________________________________________

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Introduction to Cells

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## Introduction to Cells

Topic 2:Investigating Cells

Magnification

Cells can be seen more clearly using

Microscopes _________________________ the cells

Microscopes may have two or

three__________________________________________

and one ___________________________________________.

microscopes

magnify

objective lenses

eyepiece lens

Calculating Magnification

To work out Total Magnification use the following formula

TOTAL=x

MAGNIFICATION

magnification of eyepiece lens

magnification of objective lens

Since microscopes magnify cells we have a new unit of measurement.

These new units are called

_________________________.

1mm=1000 µm

1 =1 µm

1000

microns

Measuring Cell Size

We can use microscopes to estimate the size of cells we are looking at

e.g.if we know the diameter of the field of our field of view we can then estimate the size of the cells

• if the field of view = 1mm

• then onion cells are

• ______________ mm

• or ______________(µm) in length

Field of view

Onion cell

1mm (1000 µm)

0.5

500 microns

• if the field of view = 0.5mm or 500µm

• then these cheek cells would be

• mm or ______________ µm in length

500

5

100

0.5 mm (500 µm)

Human cheek cell

4000

1000

500

Staining Cells

Animal and plant cells can be

_________________________

so that the

____________________________________

can be______________________________

stained

structures within cells

seen more clearly

• _________________________ stains the

• _________________________ of onion

• cells and also its

• _________________________.

Iodine

nucleus

cell wall

Methyl Blue

_________________________ is

used to stain the

_________________________ of

__________________________.

nucleus

human cheek cells

Acetic orcein

_________________________ is used to

stain the _________________________

present in the nucleus of cells which are