Cell Structures Flashcards
Two main types of microscopes
Light
Electron
Typical magnification of light microscope lenses
**Scanning: 4x
Low: 10x
High: 40x
Oil immersion: 100x
Eyepiece: 10x**
Two types of electron microscopes
Scanning (SEM) and transmission (TEM)
Benefits of SEM
High magnification
High resolution
3D images
Benefits of TEM
Highest magnification
Highest resolution
Slices / 2D images
Cell Theory states:
- *1. All living things are made of cells
2. Cells are the basic unit of structure and function in living things
3. All cells come from pre-existing cells**
Theory of Spontaneous Generation
Life can arise from non-living matter
Disproven
Two types of cells
Prokaryote
Eukaryote
Parts of all cells
Cell membrane
Cytoplasm
Chromosomes / DNA
Ribosomes
Prokaryote
Cells that lack membrane-bound organelles
Prokaryotic organisms
Eubacteria and Archaebacteria
Function of
Cell membrane
Semi permeable membrane
Allows only certain substances into and out of the cell
Function of
Cell wall
Strong, protective outer layer that supports and shapes the cell
Prevents against drying out (prokaryotic cells)
Function of
Capsule
Sticky outer-most layer on some prokaryotes
Aids in attachment to other cells or the substrate
Helpful for evading the immune system
Function of
Flagella
Movement
Function of
Ribosome
Protein synthesis
Function of
Cytosol
Has dissolved substances that can be used for chemical reactions
Function of
Cytoplasm
Contains cytosol and organelles (except nucleus in eukaryotes)
Function of
Chromosome
Instructions for making proteins
Tightly coiled to fit into nucleus or nucleoid region
Function of
Pili
Prokaryotic sex organ that allows two cells to join and exchange genetic information
Function of
Nucleolus
Makes ribosomes
Function of
Nuclear envelope
Separates cytoplasm from nucleoplasm
Protection of DNA in eukaryotic cells
Function of
Nuclear pores
Allows for movement of nutrients into and out of the nucleus, and for the movement of RNA out of the nucleus
Function of
Smooth Endoplasmic Reticulum (sER)
Lipid synthesis
Function of
Rough Endoplasmic Reticulum (rER)
Location of bound ribosomes, which produce proteins that go into the rER
Modification of proteins
Function of
Golgi apparatus
Chemical modification, sorting, and packaging of proteins and other chemicals
Function of
Vesicles
Packages of chemicals
Function of
Lysosomes
Contain hydrolytic enzymes that break down cellular materials (waste, pathogenic organisms, etc)
Function of
Peroxisomes
Contain enzymes to break down hydrogen peroxide
Function of
Centriole
Produce cytoskeleton structures prior to and during animal cell division
Function of
Cytoskeleton
Provides support for cells (especially animal cells) and aids in transport of structures
Function of
Mitochondria
Site of cellular respiration
Production of usable chemical energy
Function of
Chloroplast
Site of photosynthesis
Converts energy from sunlight into sugar
Function of
Large Central Vacuole
Water storage in plant cells
Maintains cell turgidity (uprightness)
Eukaryote
Cells with membrane-bound organelles