Biology 121 Chapter 5 Test Questions and Correct Answers
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Course
BIO 121
Institution
BIO 121
Functions of plasma membrane -separate 2 aqueous environments - regulate the passage of materials between the two aqueous environments - serve as the site for various biochemical functions - allow communication between cells - create attachments within and between cells
Phospholipids responsible f...
Biology 121 Chapter 5 Test Questions
and Correct Answers
Functions of plasma membrane ✅-separate 2 aqueous environments
- regulate the passage of materials between the two aqueous environments
- serve as the site for various biochemical functions
- allow communication between cells
- create attachments within and between cells
Phospholipids ✅responsible for the isolating function of membranes
Proteins ✅responsible for selectively exchanging substances and communicating with
the environment controlling biochemical reactions and forming attachments
Fluid mosaic model ✅indicates that each membrane consists of a mosaic of different
protiens that constantly shift and flow within a viscous fluid formed by a double layer of
phospholipids
Phospholipid bilayer ✅- fluid portion of the membrane
- plasma membranes face both exterior and interior watery environments
- hydrophobic and hydrophilic interactions drive phospholipids into bilayers
Hydrophobic ✅water-hating
Hydrophilic ✅water-loving
Glycoprotein ✅carbohydrates attached to outer membrane surface of protiens
Diffusion ✅substances move down gradient across membranes
Solute ✅a substance that can be dissolved in a solvent
Solvent ✅a fluid capable of dissolving a solute
Brownian motion ✅molecules and ions in solution are in constant motion
Passive transport ✅diffusion of substances across cell membranes down
concentration gradients
Active transport ✅transport of substances across cell membrane that requires use of
cellular energy (atp)
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