Concept explainers
Interpretation:
Location of non polar side chains of proteins in an integral membrane protein must be explained.
Concept introduction:
Proteins are biological
Amino acids are molecules that contain both amino group and
Structure of proteins plays a very important role in their function. Proteins are very complex in structure. Structure of protein is studied in four levels: Primary, Secondary, Tertiary and Quaternary structure.
Membrane proteins are found in biological membranes and play a role in various biological processes. They also act as channels for movement of various molecules in and out of the membrane.
Integral membrane proteins are characterized by strong interaction with the membrane. They are permanently bound to the membrane.
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Introduction to General, Organic and Biochemistry
- 22-53 Do iron and zinc ions play role in protein structure? If so, what is the role for either or both?arrow_forward21-101 Glycerophospholipids tend to have both a positive charge and a negative charge in their hydrophilic portions. Does this fact help or hinder lipid packing in membranes? Explain.arrow_forward22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?arrow_forward
- 21-85 Which of the following statements is (are) consistent with what is known about membranes? (a) A membrane consists of a layer of proteins sandwiched between two layers of lipids. (b) The compositions of the inner and outer lipid layers are the same in any individual membrane. (c) Membranes contain glycolipids and glycoproteins. (d) Lipid bilayers are an important component of membranes. (e) Covalent bonding takes place between lipids and proteins in most membranes.arrow_forward22-104 Why is collagen not a very good source of dietary protein?arrow_forward21-87 Which statements are consistent with the fluid mosaic model of membranes? (a) All membrane proteins are bound to the interior of the membrane. (b) Both proteins and lipids undergo transverse (flip-flop) diffusion from the inside to the outside of the membrane. (c) Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane.arrow_forward
- 21-90 To what extent do lipids and carbohydrates play structural roles in living organisms? Do these roles differ in plants and in animals?arrow_forwardWhy is complete hydrolysis of a protein not also protein denaturation?arrow_forward21-100 What are the functions of a cell membrane? To what extent is a bilayer that consists entirely of lipids able to carry out these functions?arrow_forward
- What element is always present in proteins that is seldom present in carbohydrates and lipids?arrow_forward22-49 Based on your knowledge of the chemical properties of amino acid side chains, suggest a substitution for leucine in the primary structure of a protein that would probably not change the character of the protein very much.arrow_forward22-45 Proteins are least soluble at their isoelectric points. What would happen to a protein precipitated at its isoelectric point if a few drops of dilute HCl were added?arrow_forward
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