Mr P bio 5 cells Flashcards
what is the purpose of the nucleus?
contains the DNA necessary for controlling the cell
what is the structure of the nucleus?
surrounded by a double membrane which is perforated by pores called nuclear pores (to allow passage of large molecules such as RNA), in nucleus is the nucleolus and chromatin
what is the function of the nucleolus?
site of ribosomal RNA synthesis
what is chromatin? (in nucleus)
made of DNA and coiled around protein, during cell division chromatin comes together and forms the thread like structures called chromosomes
is the mitochondrion made from a double or single membrane?
double
what are the folds in a mitchondrion called?
cristae
what do cristae do?
increase the surface area for enzymes for respiration
what is the name of the flattened sacs that are a part of the golgi and endoplasmic reticulum?
cisternae
what is the function of the rough endoplasmic reticulum?
transports proteins throughout the cell
what type of cells contain lots of RER?
cells which make a lot of proteins i.e. secrete enzymes or antibodies
what is the function of the Smooth endoplasmic reticulum?
to synthesize lipids, carbs and steroids
what is the structure of ribosomes? (3)
made up of two sub units, contain ribosomal RNA and protein, very small only 25nm in diameter
what is the function of the Golgi apparatus?
it sorts modifies and packages molecules (like proteins) produced by the cell, into vesicles
what is the structure of the golgi?
composed of flattened sacs made of membranes. the sacs are fluid filled and pinch off smaller sacs (vesicles) at their ends
what is the function of the lysosomes?
used to break down unwanted structures within the cell
what is the structure of the lysosomes?
bound by a single membrane and have no internal structure, contain a large number of hydrolytic enzymes
what is the function of the cell membrane?
controls the passage of molecules in and out of the cell
what is the structure of the cell membrane?
made up of phospholipids, proteins and carbs