cells + membranes Flashcards
plasma membrane
regulates movement of substances in and out of the cell
has receptors
made of phospholipids and proteins (carriers and channels)
glycoproteins and lipids
cholesterol
nucleus
surrounded by nuclear envelope containing nuclear pores
contains nucleolus
contains chromosomes (DNA on histones)
controls cells activities by
controlling transcription
contains DNA which has instructions to make protiens
pores allow substances to move between nucleus and cytoplasm
nucleolus makes ribosomes
mitochondria
double membrane (inner and outer)
inner membrane folded into cristae
inside is matrix
contains enzymes for respiration
site of aerobic respiration
where ATP released
chloroplast
found in plants and algae
double membrane
contains thylakoid membranes
stacked into grana
linked by lamellae (thin pieces of thylakoid membrane)
stroma - fluid (like cytoplasm)
site of photosynthesis
in stroma or grana
golgi apparatus and vesicles
fluid filled flattened sacs
processes and packages new lipids and proteins
makes lysosomes
makes vesicles
vesicles are fuid filled sacs in cytoplasm
stores lipids and proteins made by golgi
transports them out of cell
lysosomes
round surrounded by membrane
type of golgi apparatus
contains lysozymes
used to digest pathogens
break down worn out cell components
ribosomes
in cytoplasm or attached to RER
made of a small and large subunit
made of protein and rRNA
(no membrane)
site of proteinsynthesis
rough endoplasmic reticulum
fluid surrounded by membranes
has ribosomes on surface
folds and processes proteins
from ribosomes
smooth endoplasmic reticulum
same as RER but without ribosomes
synthesises and processes lipids
cell vacuole
in plant cells
membrane bound - tonoplast
in cytoplasm
contains sap
maintain pressure in cell to keep it rigid - no wilting
cell wall
rigid structure surround some
supports cells, keeps shape
plants and algae - cellulose
fungi - chitin
bacteria - murein
differences between prokaryotic and eukaryotic cells
DNA is circular not linear
DNA not is nucleus but free in cytoplasm
DNA not associated with proteins
have plasmids
have cell wall of murein
smaller ribosomes (70s)
no membrane bound organelles
structure of prokaryotic cells
plasma membrane
cell wall of murein (glycoprotein)
cytoplasm - no membrane bound organelles
just ribosomes (smaller)
plasmids - small loops of DNA
(not part of main circular DNA)
DNA free in cytoplasm
(no nucleus)
no histones (proteins)
circular
flagellum - makes cell move
capsule - made of smile to protect from attack
structure of a virus
acellular - not cells and not live
no plasma membrane
no cytoplasm
no ribosomes
survive and reproduce in host cells
core of genetic material (DNA or RNA)
capsid - protein coat round core
attachment proteins - stick out from capsid, allow to attach to host
cells to organs
tissues
a group of cells working together to perform a particular function
organs
different tissues working together
organ systems
organs working together to complete a function
how do prokaryotic cells replicate?
binary fission
- circular DNA and plasmids replicate
(DNA once but plasmid many times) - cell grows, DNA moves to opposite poles
- cytokenesis
= 2 daughter cells
one copy of DNA, variable number of plasmids