The Cell Flashcards
Ultrasctructure
detail of structure as seen using electron microscope
Cell
smallest unit of matter that can carry all processes of life
Organelles
cell components that perform specific functions for cell
examples of organelles
cell membrane, nucleus, mitochondria, chloroplasts, ribosomes, DNA, cell wall, vacuole
what is a Cell membrane made up of?
phospholipids and proteins.
Functions of cell membrane
i) controls what enters and leaves cell
ii) give support to cell
Function of nucleus
Controls cell’s activities
what is nucleus made up of? (+definitions)
i) double membrane with numerous nucleur pores
ii) nucleolus which contains RNA, DNA and proteins (makes ribosomes)
iii) chromatin which stores our genes
Function of mitochondria
supplies energy to cell
Formula of mitochondria
Food + oxygen = cO2 + water + energy
Function of ribosomes
make protiens
What is cytoplasm?
i) clear jelly fluid in cell
Function of cytoplasm
Contains all organelles within cell
Function of chloroplast
photosynthesis
What is cell wall made up of?
cellulose fibre and polysaccharides
nucleur pores
Allow mRNA to move in and out of nucleus
Function of cell wall
to give support and strengthen cell
What is a vacuole?
membrane bound sac whithin cytoplasm
Function of vacuole
provide structural support, storage, waste, protection and growth
what has a larger vacuole; plant or animal cells?
plant
features of eukaryotic organisms (eg)
i) contain nucleus and other membrane bound organelles (eg mitochondria)
ii) large cells
iii) more advanced
iv) eg plants and animals
features of prokaryotic organisms (eg)
i)cells never contain/lack nucleus and other membrane bound organelles
ii) have loop of DNA
iii) small cells
iv) not as advanced
v) eg bacteria
4 plant tissues
i) dermal tissue
ii) vascular tissue
iii) ground tissue
iv) meristematic tissue
dermal tissue
single layer of cells surrounding different parts of a plant epidermis (protection)
vascular tissue (eg)
transports materials around plant (xylem and phloem)
xylem
transports water and minerals around plant
phloem
transports food from leaves to other parts of plant
ground tissue
photosynthesis occurs here
meristematic tissue
found at growing regions of plants (eg root tips and shoot tips)
4 animal tissues
i) muscle tissue
ii) nervous tissue
iii) connective tissue
iv) epithelial tissue
muscle tissue
can contract, move bones
nervous tissue
i) composed of nerve cells called neurons
ii) carries electrical impulses to and from brain and spinal cord (CNS)
connective tissue
number of cells spread out in matrix (eg blood)
epithelial tissue
(eg lining of oesophagus)
tissue culture
growth of tissues in/on artificial medium outside an organism
in vitro
in glass
in vivo
in life