Basic Components of living system Flashcards Preview

OCR A Biology > Basic Components of living system > Flashcards

Flashcards in Basic Components of living system Deck (33)
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1

What is a dry mount?

Solid secimins are views as a whole or cut in slices

2

What is a wet mount?

Specimens are suspended in a liquid

3

What is squash slides?

The sample is squished between two slides

4

What is smear slides?

edge of a slide used to smear the sample creating a thin even coating

5

How do you calculate magnification?

size of image / actual size of object

6

What is magnification?

how many times larger the image is than the actual size of the object

7

What is resolution?

The ability to see individual objects as separate entities

8

What are the two types of cells?

Eukaryota and Prokarytic

9

What are prokaryotic?

It is a singled cells organism

10

What is a Eukaryota?

It is a multi cellular organism

11

What does the nucleus contain and its function?

Contain code of genetic information
Controls metabolic activities
It controls the activities within cell

12

What is a nucleolus?

This is responsible for production, composed of proteins and RNA

13

What is the function of mitochondria?

It is the site of aerobic respiration
It is the organelle where most ATP is made

14

What is the function of a cell surface membrane (plasma membrane) and where is it found?

This controls which substances enter and leave the cell.
It also acts as a hormone receptor
It is found on the surface of animal cells and under the cell wall on plant cells.

15

What is the function of vesicles and where are they found?

A small fluid filled sac used to store and transport substances
They can be found anywhere in the cell

16

What is the functions of lysosomes?

They contain digestive enzymes, used to break down waste.

17

What is the function of a cytoskeleton?

In all eukaryotic cells, network of fibres, important for shape and stability of the cell

18

What is the function of microfilaments?

Cells movement in cytokinesis

19

What is the function of microtubles?

Determines shape of cell

20

What is the function of a flagella?

It is use to enable cell mobility and detecting chemical changes

21

What is the function of cilia?

Small hair like structures found on the surface membrane. The microtubules allow the cilia to move.

22

What is the function of the smooth endoplasic reticulum?

Sythesisies and processes lipids

23

What is the function of the rough endoplasic reticulum?

Has ribosomes bound to the surface, it is used for systheis and transport of protiens

24

What is the function of the golgi apparatus?

This modifies and packages proteins and lipids into vesicles. Also produces lysosomes.

25

What is the function of cellulose in the cell wall?

It keeps the plants rigid structure which supports plant cells

26

What is the function of a vacuole within a plant?

It contains sap, it maintains turgor so contents push against the cell wall maintained a rigid framework surrounded by a tonoplast

27

What is the function of chloroplasts?

Site of photosynthesis

28

What are the characteristics of a light microscope

Maximum resolution of 0.2nm
Magnification of x1500
Can use dead or living samples

29

What are some advantages and disadvantages of light microscopes?

+ Cheap and easy to use
+ Dont distort image
- Not very powerful
- Cant see 3D or inside cells

30

What are the characteristics of a Laser scanning co focal microscope?

Special type of light microscope
Multiple images are produced combined to create a 3D image