Cell, Microscopes And Units Flashcards
What are the 3 principles of cell theory
-the cell is the fundamental unit of structure and function in living things
-all organisms are made up of one or more cells
-cells arise from other cells through cellular division
What are similarities between prokaryotic cells and eukaryotic cells
-being alive
-having a cells membrane
-having dna
Ribosomes
-The ability to divide and reproduce
Describe the structure and function of mitochondria
Double membrane
Site of aerobic respiration
Totipotent definition
Can give rise to any type of cell
Define pluripotent
Can give rise to most types of cell, but not extra-embryonic cells (e.g placenta)
Multi potent cells definition
Cells differentiate into limited number of specialised cells
Define haematopoesis
A pathway where haematopoietic stem cells which are found in the bone marrow of adults, can differentiate into blood cells
What is mitosis
A process where a single cell divides into 2 identical daughter cells
What are the 3 key types of microscopes
-optical (light) microscopes
-transmission electron microscope
-scanning electron microscope
Light microscope key facts
-used to visualise small structures and samples by magnifying image of how they interact with visible light
-lower magnification
-colour images
-can view living samples
-poorer resolution
-used to visualise fine details
Electron microscope key facts
-a beam of electrons condense by electromagnets
-has a higher resolving power due to electrons having short wavelength
-higher magnification
-black and white images
-samples placed in vacuum, therefore non-living
Define magnification
Refers to how many times larger the image is compared to the object
Define resolution
The minimum distance between two objects where they can be viewed as seperate entities
