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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

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__________________________________________

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 measurement.

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


Field of view

Onion cell

1mm (1000 µm)

0.5

500 microns


500

5

100

0.5 mm (500 µm)

Human cheek cell


4000 measurement.

1000

500


Staining Cells measurement.

Animal and plant cells can be

_________________________

so that the

____________________________________

can be______________________________

stained

structures within cells

seen more clearly


Iodine

nucleus

cell wall


Methyl Blue measurement.

_________________________ is

used to stain the

_________________________ of

__________________________.

nucleus

human cheek cells


Acetic orcein measurement.

_________________________ is used to

stain the _________________________

present in the nucleus of cells which are

about to divide.

chromosomes


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