Lipids are common components of membranes and cell walls. What is the structural motif of membranes? D A) lipid bilayer B) micelle C) hydrophobic tails D) unsaturated triglycerides E) steroidal packing

The movement of water along a concentration gradient through a semi-permeable membrane: A) osmosis B) endocytosis C) diffusion D) active transport Question 4 Which bonds are created when the primary structure of a protein forms? OA) peptide bonds B) ionic bonds C) glycosidic bonds D) hydrogen bonds

When a living cell, which has an outer membrane made of phospholipids, is placed in an aqueous (water) solution containing K+ and Na+ ions, one observes that these ions appear inside the cell. One would hypothesize that a) the phospho groups moved the ions through the Fatty Acids. b) the cell would swim away. c) H2O dissolved the membrane d) lipids had moved in and out of the cell through the water e) there must be a special mechanism moving the ions because of the properties of Fatty Acids.

In an adipose cell, after being synthesized by the ribosomes and the rough endoplasmic reticulum a protein involved in hydrolysis of lipid could be transported to the: a) mitochondrion, b) smooth endoplasmic reticulum, c) Golgi apparatus, d) Chloroplasts, e) nucleus

Which of the following is an example of secondary protein structure?A) DipeptideB) TriglycerideC)α -helixD) Amino acidE) Fatty acid

Water-soluble proteins such as myoglobin tend to fold such that: A) hydrophobic amino acids R-groups are on the interior of the protein and hydrophilic groups are on the outside OB) all peptides form hydrogen bonds with water. C) hydrophilic amino acid R-groups are on the interior of the protein and hydrophobic groups are on the outside. O D) hydrophilic and hydrophobic amino acid R-groups form hydrogen bonds with each other.

A) Briefly describe the basic structure of phospholipids and explain how they can provide an effective barrier against the unregulated movement of molecules into or out of cells. B) Not all phospholipids are identical to one another. Describe two components (parts) of that can be altered to create variation between different phospholipids.

What type of bonds/forces stabilize protein secondary structure? A) ionic (electrostatic) B) hydrogen bonds C) hydrophobic forces D) A and C O E) A, B and C

Which is an appropriate statement of involvement of the hydrophobic effect in protein folding? A) Nonpolar portions interact with polar portions in the interior of the protein. O B) Nonpolar portions of the molecule associate with one another in the interior of the protein. OC) Nonpolar portions of the molecule can be placed on the surface of the molecule only if hydrogen bonded to water. OD) Polar portions of the molecule are generally exposed to solvent to interact effectively with water.

You have a cellulose sack that is impermeable (i.e. NOT permeable) to starch molecules and is filled with a solution, comprised of 20% starch.  It is placed in a container of 100% distilled water.     a) What term describes the solution in the sack compared to the solution surrounding it?    i) HYPERTONIC ii) HYPOTONIC iii) ISOTONIC   b)  In which direction will the water molecules move faster?   i) INTO THE CELL ii) OUT OF THE CELL iii) SAME IN BOTH iv) NOT AT ALL   c) In which direction will the starch molecules move? i) INTO THE CELL ii) OUT OF THE CELL iii) SAME IN BOTH iv) NOT AT ALL