Producing New Cells Flashcards
How to multicellular organisms grow and develop
They grow and develop through cell division but this is not the only thing that causes this
Cell division
Division of the ………………….
Nucleus then cytoplasm
Cell division is controlled by what
The nucleus
What does uncontrolled cell division lead to
Cancer
Basic mitosis stages
Duplicate
Lines up
Separates
Divides
Mitosis explanation
Chromosomes duplicate and supercoil,chromosomes line up at the equator,spindle fibres then attach to the chromosomes and contract and separate them to poles,nuclear membrane reforms around chromosomes and cell divides
Why are aseptic techniques used
Used to avoid contamination of sample/surrounding
2 examples of aseptic techniques
An autoclave: this heats the sample to a high point until there is no living thing left
Flaming: used to kill bacteria on top of bottles or equipment before and after use
Growth media for aseptic techniques
Nutrient agar , nutrient broth
What is the cell membrane composed of
Proteins and (phoso)lipids
The cell membrane structure is…………
Selectively permeable
What is the model equivalent to the cell membrane structure
Visking tubing
Passive transport
High to low concentration. Down a concentration gradient. Doesn’t need energy
What does passive transport include
Diffusion of any substance and osmosis
Active transport
Movement of dissolved molecules. Low to high concentration. Particles move against concentration gradient. Requires energy eg protein pumps and ATP
