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Cell Membranes Organization

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Questions and Answers

What are the three major components of biological membranes?

Phospholipids, glycolipids, and nucleic acids

Lipids, proteins, and sugars (correct)

Fatty acids, amino acids, and starch

Cholesterol, proteins, and carbohydrates

In biological membranes, what type of molecules form two-layered sheets?

Cholesterol

Carbohydrates

Lipids (correct)

Proteins

What is the main function of membranes in cells?

To regulate the movement of substances in an out of cells (correct)

To provide structural support to the cell

To synthesize ATP

To store genetic information

Which process takes place on membranes related to the release of energy?

Photosynthesis Signup and view all the answers

What type of interactions mainly hold lipid and protein molecules together in membranes?

Non-covalent interactions Signup and view all the answers

What is the purpose of membranes in cell-to-cell communication?

To control the flow of information between cells Signup and view all the answers

What types of lipids are found in biological membranes?

Phospholipids, glycolipids, cholesterol Signup and view all the answers

Where are sugars attached in the membrane?

One side of the membrane only Signup and view all the answers

What are the major functions of lipids in the body?

Energy storage, electron carriers, enzyme cofactors Signup and view all the answers

In what form do lipid molecules associate to form supra molecular structures?

Monolayers, micelles, bilayers, vesicles Signup and view all the answers

What is the basic structure of liposomes?

Microscopic vesicles with membrane-like lipid bilayers surrounding aqueous compartments Signup and view all the answers

What solvents are lipids soluble in?

Organic solvents like propanone, ethanol, chloroform Signup and view all the answers

What strategy do some plants use to tolerate colder temperatures?

Increasing the level of unsaturated fatty acids in their membrane phospholipids. Signup and view all the answers

How do brain cell membranes of ground squirrels adapt during hibernation?

The membranes become more fluid. Signup and view all the answers

Which type of proteins may be linked to the membrane by a glycolipid or phospholipid anchor?

Proteins with a single-pass structure. Signup and view all the answers

How do caribou adapt to cold winters to prevent excess heat loss?

By reducing circulation in the lower legs. Signup and view all the answers

What is a common feature of proteins that are linked to or embedded in the cell membrane?

They may associate with other proteins on the inner or outer face of the membrane. Signup and view all the answers

What characteristic allows membranes to stay fluid even at cold temperatures?

High levels of unsaturated fatty acids. Signup and view all the answers