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Flashcards in Maciej Chapter 1 Maciej Deck (12):
1

How do you find image size?

Magnification x Actual size

2

Name what is in an animal cell

Nucleus
Cytoplasm
Ribosomes
Mitochondria
Cell membrane

3

Name what is in a plant cell

Nucleus
Cytoplasm
Mitochondria
Cell membrane
Ribosomes
Permanent vacuole
Chloroplast

4

Prokaryotic cells

Single cell organisms (e.g. Bacteria)
Do not have nucleus
Approx length: 0.2-2um
No membrane

5

Eukaryotic cells

Multicellular
Have nucleus
Approx length 10um-100um
Membrane bound organelles

6

Diffusion

Net random movement of particles from an area of high concentration to low concentration

7

What affects rate of diffusion ?

Concentration gradient
Surface area to volume ratio
Temperature

8

Osmosis

Net random movement of water molecules from high water potential to low water potential across a potentially permeable membrane

9

Active transport

Movement if particles against the concentration gradient

10

Summarise the development of the microscope and how it helped us understand sub-cellular structure

-The light microscopes used a beam of light to magnify around 2000 times with a resolution of 200nm
-The invention of electron microscopes meant that biologists could magnify objects about 2,000,000 times with a resolution of 0.2nm

11

What is the nucleus made up of in a cell ?

Nucleus contains chromosomes made of DNA molecules, each contains a large number of genes

12

What improves the rate of diffusion in organisms ?

-Large SA/V ratio
-Thin membrane as it makes a short diffusion path
-Efficient blood supply
-Being ventilated to keep concentration gradient