basic components of living systems Flashcards
Formula to calculate magnification
magnification= image size/ actual size
Why are cells stained before being viewed with a light microscope?
Staining increases contrast between different cell components, makes them visible, and allows them to be identified
Eyepiece graticule?p o oooo
Glass disc that fits on top of the eyepiece lens that is marked with a fine scale from 1 to 100
Stage micrometer?
Microscope slide with a v accurate scale in micrometers engraved on it
Scientific drawing
A labelled line drawing used to hi light particular features and does not include unnecessary shading or detail, should have a title and state the mag
Magnification
How many times larger an images is than the actual size of the object being viewed
Resolution
Ability to see individual objects as separate entities
Function of the nucleus
Controls metabolic activities of the cell as it contains genetic information in the form of the DNA
Nucleolus
Area within nucleus that is responsible for producing ribosomes
Function of mitochondria
Site of production of ATP in final stages of cellular respiration
Vesicles
Membranous sacs that are used to transport materials in the cell
Lysosomes
Specialised forms of vesicles with hydrolytic enzymes that break down waste material in cells
Cytoskeleton?
Controls cell movement, movement of organelles with the cell, and provides mechanical strength to the cell
3 types of cytoskeleton filament
- microfilaments
- microtubules
- intermediate fibres
2 types of extension that protrude from some cells
Flagella and cilia
