🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →

HomeClass Notes1,200,000CA670,000

BISC 101 Lecture Notes - Phospholipid

27 views2 pages

chocolateporcupine218

7 Feb 2012

School

Simon Fraser University

Department

Biological Sciences

Course

Professor

Christopher Kennedy

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Plasma membrane: surrounds the cell, other membrane around nucleus, mitochondria . Made out of lipids+ proteins (also have carbohydrates) Make up fluid mosaic model; flexible; 8x10(^-19) (8,000 membranes= side of one paper) Fig 6. 9: amphipathic= hydrophilic and hydrophobic, embedded proteins (integral, external (peripheral) Determine cell features; eg) blood type (a, b, o, ab) Cell needs: sugars, amino acids, water, o2. Sugars, amino acids difficult to transport; hi lo (diffusion) No energy is required: diffusion: molecules spread, osmosis: movement of water; hypotonic hypertonic (low solute high solute) Equal distribution of solute; important for all viability. Law salt- burst- hypertonic: facilitated diffusion: help to transport proteins. Fig 7. 17: specific for molecular transport, water was aqua pores (water channels) Moving molecules against a concentration gradient (low hi) Cell has to use energy (atp: sodium- potassium pump. Na- leaves: proton pump (electro genic pump) Electrical potential created (membrane potential) -50v to -200mv. Create a pathway for ions to enter cell.

Related Documents

BISC 101 Lecture Notes - Cell Membrane, Passive Transport, Aquaporin

BISC 101 Lecture Notes - Lecture 3: Hydrophile, Phospholipid, Active Transport

BISC 101 Lecture Notes - Lecture 3: Solution, Transport Protein, Oligosaccharide

Related Questions

Which of the following is not a common way to use alpha helices in membrane proteins?

a) A single amphipathic alpha-helix is used to span the plasma membrane.

b) Several hydrophobic alpha-helices form a transmembrane protein.

c) Several amphipathic alpha-helices form a channel across the membrane.

d) An alpha-helix that has hydrophobic R groups is used to span the plasma membrane.

45. The phospholipids of the plasma membrane are_____________________.

A) Hydrophobic

B) Hydrophilic

C) Both hydrophobic and hydrophilic

D) Uncharged

48. The plasma membrane is _________________________.

A) Completely permeable

B) Impermeable

C) Selectively permeable

D) Found only in eukaryotic cells

49. Meiosis results in ________________________.

A) 2 haploid daughter cells

B) 2 diploid daughter cells

C) 4 haploid daughter cells

D) 4 diploid daughter cells

52. If a thousand offspring of a cross have the genotype Aa, theparents of the cross can be symbolized as:

A) AA x aa

B) Aa x Aa

C) Aa x aa

D) AA x Aa

54. The replication of DNA_________________________________________.

A) Produces RNA molecules

B) Produces complementary new strands of DNA

C) Produces two DNA molecules, each of which is half-new andhalf-old

D) Generates excessive DNA, which eventually causes the nucleusto divide

55. Information stored in DNA is transferred from the nucleus tothe cytoplasm of eukaryotic cells in the form of______________________.

A) DNA

B) RNA

C) Lipids

D) Proteins

6.) A nitrogen atom that has no charge has five protons and________________electrons

10.) Organic compounds consist mainly of_______________atoms

MEMBRANE STRUCTURE ONLY

1.desribe the structure of the cell membrane. what are thelipids found in the cell membrance and what are theirfunctions?

2.what characteristics of phospholipids determines membranefluidity?

3. compare integral and peripheral membrane proteins

4.list common functions of membranes and proteins