Biological membranes are present in all cells, and they make up the endomembrane system of eukaryotic cells. They have many functions, including acting as barriers that selectively allow the transport of small molecules and ions into and out of the cell or organelle. A biological membrane is a bilayer that contains lipids with hydrophobic head groups oriented toward the solvent (extracellular fluid and cytosol) and hydrophilic tail groups pointing inward. hydrophilic head groups oriented toward the solvent (extracellular fluid and cytosol) and hydrophobic tail groups pointing inward. hydrophilic head groups pointing inward and hydrophobic tail groups oriented toward the solvent (extracellular fluid and cytosol). Which of these are components of biological membranes? nucleic acids proteins lipids
Added by Dawn S.
Close
Step 1
Biological membranes are bilayers that contain lipids. So, lipids are definitely a component of biological membranes. Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 101 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The plasma membrane is made up of two layers of molecules. One end (the phosphate head) is polar and is in contact with the aqueous (watery) fluid both and the cell. Therefore this region is said to be. The interior of the membrane contains tails made of fatty acids and do not interact with the aqueous fluid. The plasma membrane also contains two broad groups of membrane proteins. The first are proteins that penetrate into the phospholipid bilayer. (Some that go all the way through from one side to the other are called proteins. The second group are proteins that adhere to one side of the membrane.
Sukhwinder N.
Membrane-associated proteins can be distinguished by the types of interactions they have with the lipid bilayer and their structural motifs. Match each statement to the category of membrane-associated protein it describes. Membrane-spanning α helix Membrane-spanning β strands Lipid-anchored membrane protein Peripheral membrane protein Answer Bank: often contain a residue with covalently attached glycosyl phosphatidylinositol amino acid sequence pattern: nonpolar R group, polar R group (repeats) composed of about 20 hydrophobic residues membrane attachment depends upon electrostatic interactions with membrane phospholipid head groups can usually be released from membrane by concentrated salt solutions
Sai S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
200,000+
Students learning Biology with Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD