Investigating Cells REQ.PRAC

Question 1

Units of measure

Answer 1

CENTImetre - 1 x 10^2
MILLImetre - 1 x 10^3
MICROmetre - 1 x 10^6
NANOmetre - 1 x 10^9

Question 2

What is resolution ?

Answer 2

Ability to see two or more objects as separate

Question 3

When was the light microscope developed and what did it allow scientists to see ?

Answer 3

-in 16th century, allowed scientists to see plant,animal and bacterial cells

Question 4

When was the electron microscope first used ?

Answer 4

1933, showed the passage of electrons rather than light, mitochondria and chloroplasts can be studied as well as ribosomes

Question 5

Equation of calculating magnification

Answer 5

Size of image
———————-
Size of real object

Question 6

What is magnification

Answer 6

How many times larger the image is than the real object

Question 7

REQ PRAC

Answer 7

1) place a tissue sample on a microscope slide
2) add a few drops of a suitable stain
3) lower a coverslip
4) place slide on microscopic slide and and focus on cells using low power
5) change to high power and refocus
6) draw any types of cells that can be seen and add a scale line to diagram (FOCUS ON MILLIMETRES)