B1.1 Cell Structures Flashcards
What does the nucleus of a cell do?
Contains genetic material, controls activities of cell
Mitochondria is the site of…
Aerobic respiration
A eukaryotic cell is…
A cell whose genetic material is contained within the nucleus
What cell organelles are found in plant cells but not in animal cells?
Vacuole
Chloroplasts
Cell wall
Cell theory:
1. All organisms are made up of…
One or more cells
Cell theory:
2. The cell is the…
Basic unit of structure and organisation in organisms
Cell theory:
3. All cells come from…
Pre-existing cells
Cytoplasm is the site of most ____ ____ in a cell
Chemical reactions
The vacuole contains the ____ ___ to keep the plant alive and ____ the plant
Cell sac
Structure
The cell membrane controls…
What enters and leaves the cell
What cell organelle creates protein synthesis?
Ribosome
What does the cell wall do?
Structures the plant cell
A prokaryotic cell is…
A cell without a nucleus whose genetic material is found within the cytoplasm
A plasmid is…
A circular piece of DNA used to store genes not involved in reproduction
The nucleoid region is the area of _____ that contains single bacterial ____ _____
Cytoplasm
DNA molecule
What are flagella?
Long whip-like structures that enable the cell to move through liquids
Pili are hairlike structures that enable the cell to ___ to ____. Can also be used to transfer ___ ____ between bacteria
Attach
Structures
Genetic material
The capsule is an outer covering that does what?
Protects cell from drying out and from poisonous substances
Helps cell adhere to surfaces and nutrients
I = A x M
What do I, A and M stand for?
I = image size
A = actual size
M = magnification
What is magnification?
How much bigger an image appears compared to the original object
Advantages of a light microscope?
Living specimens
Cheap
Portable
Why do samples have to be thin for a light microscope?
To allow the light to pass through
Light microscopes have a resolution up to….
0.2 micrometres
What are the two types of electron microscope?
Transmission electron microscope (TEM)
Scanning electron microscope (SEM)
