animal cell [biology]

Question 1

what is the plasma membrane

Answer 1

protects cell from its surroundings and allows substances in and out of the cell

Question 2

what is the cytoplasm

Answer 2

jelly like liquid that fills the cell , contains lots of dissolved substances and lots of chemical reactions take place inside

Question 3

what is the nucleus

Answer 3

its surrounded by a double membrane ,has pores which control what goes in and out of the nucleus in thye middle of the nuclues is the nucleolus its a region of dense dna and produces ribosomes.

Question 4

what is a ribosome

Answer 4

these make protiens , in a eukaryotic cell the ribosomes contain 80s, in a prokaryortic cell it contains 70s ribosomes (these are simpler)

Question 5

rough endoplasmic rectilium

Answer 5

flattend sacs with a membrane coverd in ribosomes(where protiens are made), has large SA so lots of protiens are produced.

Question 6

smooth endoplasmic rectilium

Answer 6

has membrane tubes ,and its were lipides are made

Question 7

what are vesicles

Answer 7

vesicles are small membrane bound sac used for storing and transpoting substaces throughout the cell

Question 8

golgi apparatus

Answer 8

modifies protiensand packages proteins after protiensynethesis ready to be transported and secreted

Question 9

what are lysosomes

Answer 9

lysosomes are enclosed in single membranes ,contain digestive enzymes and destroy old organelles and pathogens

Question 10

centrioles

Answer 10

centrioles are involved in mitosis, they are two hollow tubes at right angles to each other, they make the spindle in cell divison.

Question 11

what are mitrochondria

Answer 11

site of respiration, (atp is produced here), surrounded by a double membrane, inner membrane has folded projections which increase its SA ,the central area of the inner membrane contains a jelly like substance called the matrix.