Animal Cells Flashcards
what are types of eukaryotic cells?
animals, plants, fungi
what are types of prokaryotic cells?
archaea, bacteria
what’s the difference between eukaryotes & prokaryotes?
eukaryotes;
- nucleus containing DNA
- contains organelles
- surrounded by cell membrane
- make up multicellular organisms
prokaryotes;
- free DNA, no nucleus
- no organelles
- smaller than eukaryotes
- form single celled organisms
what are the components of an animal cell? /14
nucleus, nucleolus, mitochondria, rER, sER, Golgi apparatus, lysosomes, plasma membrane, cilia, cytoskeleton, ribosomes, centrioles, peroxisomes, cytoplasm
what’s the function of a nucleus?
cells control centre, coordinates cells activities and stores cells DNA.
what’s the function of a nucleolus?
store cells RNA and important in production of ribosomes.
what’s the function of mitochondria?
site of respiration using O2, produces ATP
what’s the function of rough endoplasmic reticulum?
contains ribosomes and is important in storage & formation of proteins
what’s the function of smooth endoplasmic reticulum?
important in production & storage of lipids & steroids
what’s the function of Golgi apparatus?
works together with the ER and important in storing and packing molecules (proteins & lipids) in vesicles ready for transport
what’s the function of lysosomes?
contain enzymes who digest waste products and debris. some have conventional lysosomes others have secretory lysosomes
what’s the function of plasma membrane?
encloses the cells contents
what’s the function of cilia?
short microscopic hair like structures, move fluid past the cells surface and helps move the cell
what’s the function of cytoskeleton?
maintains cells shape , its made up of microtubules (position organelles), actin filaments (cytokinesis & cell movements) and immediate filaments (provide strength & support).
what’s the function of ribosomes?
2 sub units which join together to manufacture proteins. 80s ribosomes are found in eukaryotic cells 70s ribosomes in prokaryotes
what’s the function of centrioles?
2 hollow cylinders arranged at right angles to each other to form centrosomes. they are important in spindle formation during cell division
what’s the function of peroxisomes?
small vesicles containing oxidative enzymes, help to remove toxic substances
what’s the name of the model of the plasma membrane?
fluid mosaic model
what are the main components of the plasma membrane?
phospholipids
describe phospholipids.
they have a hydrophilic (water loving) head - phosphate head and a hydrophobic (water hating) tail - fatty acids, these phospholipids form a bilayer
describe the bilayer.
contains proteins, some are integral and cross the membrane and others are peripheral and are found on the one side of the membrane
what are the phospholipids and proteins attached to?
phospholipids - glycolipid chains
proteins - glycoprotein chains
what’s the role of the plasma membrane?
- partially permeable & controls what exits or enters the cell
- separates contents of cell from outside environment
- allows other cells to recognise the cell as belonging to body
- allows cells to signal each other
- allows molecules (hormones/drugs) to bind to receptors in membrane
- holds components of some chemical reactions (enzymes) in place
why is it called the fluid mosaic model?
describes the cell membrane due to the fact it looks mosaic as it is made up of variety of different size components and its fluid because
what do the internal plasma membranes around organelles do?
separate contents of the organelles from cytoplasm and allow molecules be transported in and out of organelle
function of phospholipids.
controls what enters & exits the cell
function of integral proteins.
transport molecules in and out of the cell
function of glycoproteins & glycolipids.
cell recognition, cell signalling and receptors
function of peripheral proteins.
enzymes
functions of cholesterol.
maintains stability of cell.
what are the 2 types of microscopes?
- the light microscope
- the electron microscope
describe the light microscope.
use light and different lenses to magnify objects to allow the image to be seen through an eye piece. best magnification with good resolution is x1000. ONLY LIVING SPECIMEN, gives image in colour
describe the electron microscope.
uses electron instead of light to produce detailed images with high magnification (x200000 to x2000000) and high resolution ONLY NON LIVING SPECIMEN, gives image in black and white
what are the two types of electron microscopes?
- transmission electron microscope
- scanning electron microscope