Chapter 3 Flashcards
What are the two stages of protein synthesis?
Transcription- occurs in the nucleus
Translation-occurs in the cytoplasm
Hydrophobic
Tails-water fearing
Hydrophilic
Heads-Water loving
Describe the structure of the plasma membrane
Phospholipid bilayer with proteins embedded throughout
What are 3 types of cell junctions?
Tight- tightly stitched together
Ex: bladder tissue
Desmosomes-Velcro (gives wiggle room)
Ex: muscle tissue
Gap- chemical to electrical attachment
(Communication)
Ex:cardiac muscle
What are the 3 types of tonic solutions
Hypotonic,ionic, and hypertonic
What happens to a cell in a hypotonic solution?
Cells swell and burst
⬇️ solutes/⬆️ H20
What happens to a cell in a ionic solution
The cell is at equilibrium/no movement of H2O
What happens to a cell in a hypertonic solution?
Cell loses H20 & shrink (crenate)
⬆️solutes/⬇️H20
Ex: salt on a slug
What is active transport?
Requires ATP
Moves against gradient
What is a gene?
Segment of DNA codes for one protein
Describe simple diffusion
Flows directly through bilayer-lipid soluble
Describe facilitated diffusion
Assisted by protein (boat ride)
H2O passes through aquaporins
H20/protein soluble
Describe diffusion
Moving things across membrane
High➡️Low concentration solution
Passive-no energy used
Describe osmosis
Diffusion of H20