509 cells Flashcards
What is a cell?
the basic structural and functional unit of living organisms
Name the structure of a cell?
Plasma membrane
cytoplasm
plasma membrane
Name the structure of the nucleus?
Nuclear pores
Nuclear envelope
chromatin
nucleolus
What does the nucleus do?
control centre of the cell
directs cell activity for reproduction
contains genetic matarial - DNA which carries instructions for synthesis of proteins
Encloses the cytoplasm, acts as a semipermable barrier to the movement of substances in and out of the cell?
The plasma membrane - has microvilli - increases the cells absorptive surface area
includes cell junctions - gap junctions - desmosomes junctions
Is where most cellular activities occur?
The cytoplasm - contains cytosol and organelles
Are sites of ATP synthesis?
Mitochondriab- power house of the cell
Are sites of protein sysnthesis?
Ribosomes
Packages porteins for export from the cell?
Golgi apparatus
Carries out intercellular digestion?
Lysosomes
disarm dangerous chemicals in the cell?
peroxisomes
Function in cellular support and motion?
Cytosketal elements
Plays role in cell division and form the bases of cilia and flagella?
Centrioles
smooth and rough ER?
Endoplasmic reticulum
Rough er - studded with ribosomes
Smooth Er - free on ribosomes
Phospholipid =
glycerol - glycocalyx
Movement =
if its in water = osmosis
H-L
What is protein synthesis?
DNA opens up and is copied by RNA
What does MRNA do?
goes from nucleus to ribosome that moves along and cause transfer RNAB (= messenger RNA) to bring amino acids in order
What parts of cell division are there?
Interphase
Prophase
metaphase
telophase
What is Interphase
DNA is copied (46)
What is prophase?
Lose our membrane from spindle
What is metaphase?
Chromosomes are pulled apart
What is telophase?
(cytokinesis) cell splits and new nuclear membrane