Lecture 3 Flashcards
Cell structure
What do membranes do in cells?
Secrete protein, create separate spaces in cells, serve as reaction sites
What does the plasma membrane do?
Controls the movement of molecules into and out of the cell and is important for cell-cell signalling and adhesion.
What is the plasma membrane comprised of?
A phospholipid bilayer with proteins and cholesterol.
Function of mitochondrion?
Cellular respiration, it makes energy in the form of ATP
What is mitochondrion surrounded by?
Two bilayer membranes
Function of lysosomes?
Trash disposal of the cell.
Lysosomes degrade material internalised by the cell as well as old parts molecules of the cell itself
Function of the nucleus?
Is responsible for housing the cell’s genome (DNA) and RNA synthesis
Explain the membranes that surround the nucleus
It is surrounded by two membranes called the nuclear envelope. The outer nuclear membrane is continuous with the rough endoplasmic reticulum.
What is the nucleolus?
Is the site of ribosomal RNA and partial ribosome biosynthesis. It is not membrane bound.
Function of endoplasmic reticulum?
The site for synthesis of lipids, membrane and secretory proteins.
Smooth ER
fatty acid and phospholipid biosynthesis as well as detoxification
Rough ER & ribsomes
Site of all secretory proteins
Golgi complex function?
Responsible for processing and sorting proteins.
Making sure things go to the right places.
What way do proteins progress through the Golgi complex ?
Cis to medial to trans-Golgi
What does the high amounts of catalase in peroxisomes allow them to do?
Convert peroxide to h2o and o2
