chromatin is formed of strands of dna and proteins called histones
DESCRIPTION
NUCLEUS HAS DOUBLE MEMBRANE NUCLEAR ENVELOPE ,HAVING NUMEROUS PORES FOR COMMUNICATION, CONTAINS DNA, CHROMOSOMES VISIBLE WHEN CELL IS DIVIDING, CELL CANNOT REPRODUCE WITHOUT A NUCLEUS . - PowerPoint PPT PresentationTRANSCRIPT
Name of part of eukaryotic cell
Function
Cytoplasm Occurs inside plasma membraneOrganelles are present hereThe fluid portion is called cytosol
Endoplasmic reticulum(smooth and rough)
•Extensive network of tubules or channels•Enables transportation of materials throughout the internal region of the cell•Smooth ER: production of membrane phospholipids and cellular lipids production of sex hormones detoxification of drugs in the liver storage of calcium ions in muscle cells, needed for contraction transportation of lipid based compounds aiding liver in releasing glucose into the bloodstream•Rough ER: ribosomes on its surface involved in protein synthesis so involved in protein development and transport placed close to nucleus
Ribosomes Either free or attached ER.Do not have an exterior membrane.Carry out protein synthesisMade up of protein and RNAComposed of two subunits that equals to 80S in eukaryotes. So they are larger and denser than that of prokaryotes.Svedberg (s) values, which are based upon their rate of sedimentation in a centrifuge.
lysosome •Arise from Golgi apparatus•Lacks internal structure, bounded by a membrane and contain many different hydrolytic enzymes, have acidic environment inside•Act as intracellular digestive centre where the enzymes catalyze the breakdown of proteins, nucleic acids, lipids and carbohydrates•Also breaks down materials brought in by phagocytosis
Golgi apparatus Consists of flattened sacs called cisternae stacked up on top of each other involved with collection, packaging, modification, and distribution of materialsSide facing r ER is called cis side. It receives products from rER Other side is called discharged from opposite side called trans side
Mitochondria double membrane bound Rod shaped organelle
Size close to a bacterial cell
Have their own DNA(A circular chromosome)
Inner membrane folds inside into cristae( sing: crista) provides huge surface area
Inside is matrix
Produces cellular energy called ATP…power house of cell
Has its own ribosome (70S)
NUCLEUSHAS DOUBLE MEMBRANE NUCLEAR ENVELOPE ,HAVING NUMEROUS PORES FOR COMMUNICATION,
CONTAINS DNA, CHROMOSOMES VISIBLE WHEN CELL IS DIVIDING, CELL CANNOT REPRODUCE WITHOUT A NUCLEUS
• Chromatin is formed of strands of DNA and proteins called histones.
• A nucleosome consists of 8 histones with a strand of DNA wrapped around them and secured with a 9th histone.
• A chromosome is a highly coiled structure of many nucleosomes.
Molecules of the cell ribosomes are manufactured in the nucleolus. These molecules pass through the nuclear envelope and assembled outside.
Centrosome occurs in eukaryotic cells.It consists of a pair of centrioles.
Involved in assembling microtubules during cell division
SUMMARY
