A.   None of these statements is correct

B.   hypertonic to Paramecium

C.   isotonic to Paramecium

D.   hypotonic to Paramecium

A.   All of these statements are correct

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

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

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

A.   a large, polar molecule like glucose

B.   a sodium ion

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

D.   a small, polar molecule like water

A.   Such molecules diffuse freely.

B.   Through facilitated diffusion.

C.   Via aquaporin channels.

D.   Via active transport.

A.   the presence of double bonds in fatty acid chains

B.   increasing temperature

C.   increasing length of the hydrocarbon chains

D.   removing cholesterol

A.   facilitated osmosis

B.   osmosis

C.   simple diffusion

D.   facilitated diffusion

E.   active transport

A.   water

B.   Ca2+

C.   glucose

D.   water, glucose and Ca2+

A.   Dehydration

B.   Cell lysis

C.   None of these.

D.   High blood pressure

A.   FALSE

B.   TRUE

A.   cholesterol, phosphoglycerides and sphingolipids

B.   triglycerides, cholesterol and phosphoglycerides

C.   phosphoglycerides, sphingolipids and triglycerides

D.   cholesterol, triglycerides and sphingolipids

A.   glycolipids

B.   proteins

C.   cholesterol

D.   triglycerides

A.   quarternary structure

B.   tertiary structure

C.   primary structure

D.   secondary structure

A.   FALSE

B.   TRUE

A.   They can occur between most polar molecules.

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

C.   They are weak attractive interactions

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

A.   FALSE

B.   TRUE

A.   Secondary

B.   Primary

A.   van der Waals forces

B.   nonpolar covalent bonds

C.   Both hydrophobic interactions and nonpolar covalent bonds

D.   hydrogen bonds

E.   hydrophobic interactions

A.   quaternary structure motifs

B.   functional groups

C.   domains

D.   protein motifs

A.   FALSE

B.   TRUE

A.   the core of a water-soluble protein

B.   between two charged molecules

C.   on the surface of a water-soluble protein

D.   between two ions

E.   in contact with water molecules

A.   Natured

B.   Denatured

A.   Differential Centrifugation

B.   Differential Rotation

A.   They carry a relatively uniform negative charge distribution.

B.   They all have the same degree of hydrophobicity.

C.   They are all the same size.

D.   They carry a relatively uniform positive charge distribution.

E.   They are all the same molecular weight.

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

B.   The cell is the structural unit of life

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

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

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.   TRUE

B.   FALSE