Class Notes (839,476)
Canada (511,349)
BISC 101 (292)

Biology .pdf

4 Pages

Biological Sciences
Course Code
BISC 101
Christopher Kennedy

This preview shows page 1. Sign up to view the full 4 pages of the document.
Membranes • Plasma membrane surrounds the cell • Endo-membranes ◦ Surround organelles (nucleus, chloroplast, Goligi body) [Fig 6.9] • Thickness-8000 membranes, 1 page thickness • Membranes have lipids and proteins and carbohydrates ◦ Are flexible -> fluid mosaic model • Lipids - are phospholipids ◦ Bilayer present ‣ Hydrophilic ‣ Hydrophobic ‣ Amphipathic [Fig 5.13] - [Fig 8.12] structure of a phospholipid • Hydrophilic region • Hydrophobic region • Membranes are selectively permeable ◦ [Fig 7.5] structure of animal cells plasma membrane • Proteins embedded in membrane ‣ Many functions [Fig 7.10] functions of membrane proteins • Integral protein... Sits inside • Peripheral protein... Outside • Carbohydrates = oligosaccharides (short chain, 8-15 sugars) ◦ Involved in signaling ◦ Cell-to-cell recognition of foreign cells ◦ Blood groups (A, B, AB, O) ‣ Differ in carbohydrate types on blood cells Movement into/out of cell • Gases- can diffuse through membrane • Water - channels called aquaporins ◦ 3 billion water molecules per second • Ions, sugar, amino acids must be transported across transport proteins • Transport ◦ passive (no energy) neede d ◦ Active (energy needed as ATP) Passive transport • Diffusion - molecules spread into a space, down a concentration gradient (high -> low) ◦ [Fig 7.13] diffusion of molecules • Osmosis - movement of water, from low solute to high solute ◦ Maintains cell turgidity, and cell
More Less
Unlock Document

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.