bio quiz
Choose the answer that most accurately describes disaccharides.
A disaccharide contains two monomers that are linked as a result of a condensation reaction.
Which of the following is a function of lipids?
Acts as a cell membrane regulator in the form of cholesterol Create cell membranes in the form of phospholipids Act as energy storage in the form of fats Act as cell signals in the form of certain hormones
Which structures in this diagram of a cell membrane could be a protein?
B,A
Which of the following is the best explanation for why cholesterol decreases the permeability of biological membranes?
Because cholesterol is amphipathic, it fits in between the phospholipids and blocks diffusion through the membrane.
Mark each of the following statements that are true about carbohydrates:
Carbohydrates are the same thing as sugars. A single glucose molecule is an example of a monomer Carbohydrates store energy in their bonds. Carbohydrates provide structural support for cells in the form of cellulose
How can carbohydrates contain and/or display information for cells?
Carbohydrates contain and display information at the cell surface.
Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?
Carbohydrates store energy in C-H and C-C bonds that are weak and have a high potential energy.
What are the three main functions of carbohydrates?
Cell Identity Energy Cell Structure
Which of the following is TRUE of osmosis?
In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration.
Which of the following could accurately complete this statement? "Lipids that contain a high number of double bonds in their fatty acid chains will ________."
likely be liquid at room temperature
A phospholipid is a ________.
nonpolar lipid molecule that is made amphipathic by the addition of a phosphate
Which of the following types of molecules are the major structural components of the cell membrane?
phospholipids and proteins
Lipids that form membranes have what kind of structure(s)?
polar heads hydrophobic tails
