Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Cell Membrane |
Controls substances entering and leaving the cell. |
|
|
Cytoplasm |
Where most chemical reactions take place. |
|
|
Nucleus |
Contains chromosomes which carry genetic information and controls activities of the cell. |
|
|
Cell wall |
Contains cellulose; supports the plant's structure. |
|
|
Chloroplasts |
Absorb light for photosynthesis. |
|
|
Vacuole |
Space filled with cell sap. |
|
|
Mitochondria |
Site of aerobic respiration. |
|
|
How does a light microscope work? |
It passes a beam of light through the subject. |
|
|
What is a light microscope's highest possible total magnification? |
x1000 |
|
|
How does an electron microscope work? |
It passes a beam of electrons through the subject. |
|
|
What is the highest possible total magnification of an electron microscope? |
x50,000,000 |
|
|
What is one disadvantage of using a light microscope? |
Smaller highest possible total magnification compared to electron microscope. |
|
|
What is one disadvantage of using an electron microscope? |
It can only be used to study dead cells. |
|
|
How is iodine used when observing cells? |
It makes the nucleus more obvious and stains any starch present. Mostly used when preparing slides of plant cells. |
|
|
How is methylene blue used when observing cells? |
It stains acidic parts of the cell blue and makes the nucleus more obvious. Usually used to prepare slides of animal cells or bacteria. |
|
|
Unicellular organisms |
Organisms made up of just one type of cell. |
|
|
Multicellular Organisms |
Organisms made up of many different types of cells. |
|
|
Specialised cells |
Cells suited to a specific function. |
|
|
What is one example of a specialised cell? |
A red blood cell has no nucleus as to increase its storage capacity for oxygen. |
|
|
What are the levels of organisation within organisms? |
Specialised cells form tissues which then form organs which then form organs systems. |
|
|
What is diffusion? |
Molecules diffuse, through a semi-permeable membrane, from an area of high concentration to an area of low concentration. |
|
|
How much energy is required for diffusion to occur? |
None. |
|
|
Which factors can affect the rate of diffusion? |
1) Concentration, 2) Temperature, 3) Pressure. |
