W4 Cell Membranes

Question 1

what are the 5 main classes of membrane proteins

Answer 1

channels
transporters
receptors
enzymes
integrins

Question 2

what the role of the cell membrane

Answer 2

allows for gradients and energy

Question 3

how are active transporters activated

Answer 3

high affinity binding site binds to cytosol

Question 4

what do all transporters require

Answer 4

ATP

Question 5

how are secondary active transported powered

Answer 5

uphill solute transport by electrochemical gradient

Question 6

what cells take up glucose

Answer 6

muscle cells

Question 7

how does glucose enter muscle cells

Answer 7

enter through GLUT4 channels through facilitated diffusion

Question 8

how can glucose be taken up

Answer 8

enterocyte by secondary active symport

Question 9

how does glucose leave the muscle cells

Answer 9

GLUT2 channel by facilitated diffusion

Question 10

how are LDL taken up

Answer 10

receptor meditated endocytosis

Question 11

how do eukaryotic integral membrane proteins cross membrane

Answer 11

as alpha helixes with enriched hydrophobic amino acids