Cell structure and function Flashcards
What does selectively permeability mean
A barrier that allows small molecules to pass through while blocking large molecules
What is the structure of a phospholipid
Head (hydrophilic) tail (hydrophobic)
What kind of molecules can pass through the phospholipid bi-layer easier?
Small non polar molecules
Define Endocytosis in transport?
Folds into pouch surrounding particles on the outside of the cell
Define exocytosis transport?
Particles transport out of the cell vesicle
How do you measure icrt?
I = 1
C= M
R = .0831
T = 273 + temperature given
What should every graph have?
- Evenly spaced scale
- X and y axis
- Title
Hypertonic
When a solution has more stuff dissolved in it
- exit the cell
Hypotonic
When a solution has less stuff in it
-into the cell
Isotonic
When two solutions have the same concentration
-stays the same
Diffusion
Natural movement from a place to an area with a lot of them to an area with only a few of them
Amphipathic
Something that has both hydrophobic and hydrophilic parts
Active transport
Using energy (ATP) to move particles from an area of low to high concentration
Apoptosis
Natural process which cells self destruct or die in a controlled way
Osmosis
The movement of water with stuff from an area of low to high concentration to balance things out
Phospholipid bilayer
A Double layer of molecules that make up the cell membrane
Nucleus function
-Control the center of the cell
Ribosome function
-Protein synthesis
Endoplasmic reticulum function
-network of membranes and sacs
Golgi apparatus function
Synthesis and packaging of materials for transport in the vesicles
Lysosomes function
Intracellular digestion, recycles cells and materials, programmed cell death
Vacuoles function
Storage of materials (food, water, minerals, pigments, poisons)
Mitochondria function
Site of cellular respiration
Chloroplasts function
Site of photosynthesis
Peroxisomes function
Break down fatty acids, detox alcohol
Cytoskeleton function
Support motility, regulate biochemical activities
Integral proteins
Embedded in membrane
-hydrophilic head & tail
-hydrophobic middles
Peripheral proteins
Not embedded in the proteins
-held in place by the ECM or cytoskeleton
Are negative charges harder to pass cell membranes ?
Yes
Simple diffusion
High to low concentration
Facilitated diffusion
High to low concentration
ion
Has charges + -
Which are hydrophilic
