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Biology 121 Chapter 5 Test Questions and Correct Answers
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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...

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  • August 13, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • biology 121 chapter 5 test questions and correct a
  • functions of plasma membrane separate 2 aqueous
  • phospholipids responsible for the isolating funct

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  • BIO 121
  • BIO 121

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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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