Cell

Question 1

Function of a plasma membrane

Answer 1

Forms of boundary around the perimeter of each cell
Selective permeability via transport mechanisms
Anchor- cytoskeleton and functional proteins
Communication-receptor proteins recognize hormones

Structure: phospholic bilayer plus proteins

Question 2

What are the organelles we study in class?

Answer 2

Nucleus
Nucleolus – site of RNA synthesis
Ribosome-free and bound, protein synthesis
Endoplasmic reticulum- rough (protein synthesis) smooth (fat, steroid synthesis)
Golgi complex- receives proteins from ER, packages delivers to lysosomes or plasma membrane for release
Mitochondria- sight of cellular respiration

Question 3

What are the four types of cell junctions?

Answer 3

Tight junctions- fluid tight seal
Adhering junctions- forms completely around cell deep into tight junctions
Desmosomes- spot welding between two cells, provides resistance to mechanical stress
Gap junctions- allows rapid communication between cells (heart, smooth muscle, CNS)