A.   None of these statements is correct

B.   hypertonic to Paramecium

C.   isotonic to Paramecium

D.   hypotonic to Paramecium

A.   It is oriented with the small hydroxyl group embedded in the lipid bilayer and the remainder of the molecule toward the membrane surface.

B.   All of these statements are correct

C.   It interferes with the movements of the fatty acid tails of the phospholipids.

D.   It makes the cell membrane fluid at room temperature.

A.   a small, nonpolar molecule like oxygen (O2)

B.   a small, polar molecule like water

C.   a sodium ion

D.   a large, polar molecule like glucose

A.   Via aquaporin channels.

B.   Via active transport.

C.   Such molecules diffuse freely.

D.   Through facilitated diffusion.

A.   increasing length of the hydrocarbon chains

B.   increasing temperature

C.   the presence of double bonds in fatty acid chains

D.   removing cholesterol

A.   simple diffusion

B.   osmosis

C.   facilitated osmosis

D.   active transport

E.   facilitated diffusion

A.   Ca2+

B.   water

C.   glucose

D.   water, glucose and Ca2+

A.   Dehydration

B.   High blood pressure

C.   Cell lysis

D.   None of these.

A.   TRUE

B.   FALSE

A.   triglycerides, cholesterol and phosphoglycerides

B.   phosphoglycerides, sphingolipids and triglycerides

C.   cholesterol, triglycerides and sphingolipids

D.   cholesterol, phosphoglycerides and sphingolipids

A.   cholesterol

B.   proteins

C.   triglycerides

D.   glycolipids

A.   quarternary structure

B.   tertiary structure

C.   secondary structure

D.   primary structure

A.   TRUE

B.   FALSE

A.   They can occur between most polar molecules.

B.   They can be found between the two strands of a DNA molecule, occur between most polar molecules and are weak attractive interactions

C.   They can be found between the two strands of a DNA molecule.

D.   They are weak attractive interactions

A.   TRUE

B.   FALSE

A.   Secondary

B.   Primary

A.   hydrophobic interactions

B.   nonpolar covalent bonds

C.   van der Waals forces

D.   Both hydrophobic interactions and nonpolar covalent bonds

E.   hydrogen bonds

A.   protein motifs

B.   functional groups

C.   domains

D.   quaternary structure motifs

A.   FALSE

B.   TRUE

A.   between two charged molecules

B.   the core of a water-soluble protein

C.   in contact with water molecules

D.   between two ions

E.   on the surface of a water-soluble protein

A.   Denatured

B.   Natured

A.   Differential Centrifugation

B.   Differential Rotation

A.   They carry a relatively uniform positive charge distribution.

B.   They are all the same size.

C.   They carry a relatively uniform negative charge distribution.

D.   They are all the same molecular weight.

E.   They all have the same degree of hydrophobicity.

A.   Cells arise by division of a pre-existing cell

B.   All organisms are composed of one or more cells.

C.   Cells contain genetic information in the form of RNA that is passed to the next cell generation

D.   The cell is the structural unit of life

A.   All cells in culture must be able to evolve and cultured cells are not used often by cell biologists.

B.   HeLa cells are cultured tumor cells isolated from a cancer patient and used by pharmaceutical companies without permission and cells can grow and reproduce in culture for extended periods.

C.   Cultured cells are not used often by cell biologists and cells can grow and reproduce in culture for extended periods.

D.   All cells in culture must be able to evolve and heLa cells are cultured tumor cells isolated from a cancer patient and used by pharmaceutical companies without permission and cells can grow and reproduce in culture for extended periods.

A.   FALSE

B.   TRUE