Cell Membrane
Consists mainly of cellulose fibres arranged in an overlapping fashion to allow carbon dioxide, oxygen, and water to flow through it.
What are the 3 main parts of the nucleus?
The nuclear envelope, the chromatin, and the nucleolus.
Define endoplasmic reticulum.
Maze of channels that begins at the nuclear envelope and winds through the cytosol in interconnected sacs and tubules.
What are vesicles?
Tiny sac-like organelles from the plasma membrane or endomembrane system that transport and release various biological molecules into or outside the cell.
Define ribosomes.
The plasma membrane requires reinforcing structures to give it rigidness. True or false?
True
What is nuclear envelope?
Membrane formed by two lipid bilayers whose structure is perforated by nuclear pores with proteins attached inside.
What does the endoplasmic reticulum provide?
What is the definition of golgi appartus?
What is the cytoskeleton?
Network of protein fibres spread throughout the cytoplasm.
Describe extracellular matrix.
Mixture of supporting proteins and polysaccharides that binds adjacent cells together, has functions in molecular signalling, and anchors cells within tissues.
Why was chromatin named like that?
Because of its ablity to be coloured by the colours used to observe it under the light microscope.
What's rough endoplasmic reticulum?
Has the most of its membranes covered by ribosomes so that it seems rough when viewed under the microscope.
Organelles similar to membranous sacs but more extensive and specialised.
Function of the cytoskeleton.
What is the fluid mosaic model?
Considers the cell membrane a double layer of compacted phospholipid molecules with various proteins embedded to form a mosaic.
The nucleus may contain one or more nucleoli. True or false?
True
Function of ribosomes.
They synthesise proteins.
Definition fo mitochondria.
Organelles made of membranes where the outer membrane is smooth, and the inner membrane forms a series of folds called cristae.
What are the 3 primary fibres of the cytoskeleton?
Microfilaments,intermediate filaments, and microtubules.
Name 2 parts of the phospholipids.
A polar head (charged) and hydrophilic (attracted to water) and a tail of fatty acids that is non-polar and hydrophobic (repelled by water).
What does RNA stand for?
Ribonucleic acid
What does the smooth endoplasmic reticulum lack?
Ribosomes and curves through the cytoplasm with flat connecting tubes.
Define peroxisomes
They're other organelles composed of vesicles containing enzymes that break down long chains of fatty acids or amino acids.
Describe one of the primary fibres of the skeleton.
Microfilaments: are the thinnest and are composed of actin.
Intermediate filaments: has a medium diameter and is composed of various proteins.
Microtubules: are the thickest and are composed of tubulin.