California State University, Fullerton » Biology » Biol 303 - Intermediate Cell Biology » Fall 2021

Biol 303 - Intermediate Cell Biology » Fall 2021 » Exam 1 Fast Facts

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Question #1

An organism like a Paramecium has contractile vacuoles to continually eliminate from the cell water that has leaked in by osmosis. Thus, the water environment in which this organism lives is

A. hypotonic to Paramecium

B. None of these statements is correct

C. hypertonic to Paramecium

D. isotonic to Paramecium

Question #2

Which of the following is true about the cholesterol associated with membranes?

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

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

C. All of these statements are correct

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

Question #3

Which of the following crosses lipid bilayers the fastest?

A. a large, polar molecule like glucose

B. a small, polar molecule like water

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

D. a sodium ion

Question #4

How do cells transport small, lipid-soluble molecules across the cell membrane?

A. Via aquaporin channels.

B. Through facilitated diffusion.

C. Such molecules diffuse freely.

D. Via active transport.

Question #5

Which of the following increases the strength of the hydrophobic interactions in lipid bilayers and thus makes them less permeable to polar molecules?

A. the presence of double bonds in fatty acid chains

B. removing cholesterol

C. increasing length of the hydrocarbon chains

D. increasing temperature

Question #6

Diffusion during which the substance to be transported binds selectively to a membrane-spanning protein, which helps the process along, is called

A. facilitated diffusion

B. simple diffusion

C. facilitated osmosis

D. active transport

E. osmosis

Question #7

Which of the following compounds can diffuse across a phospholipid bilayer by themselves?

A. Ca2+

B. water, glucose and Ca2+

C. glucose

D. water

Question #8

A person is sailing in the ocean and decides to drink some of the seawater. What kind of problem might this person end up having?

A. None of these.

B. Dehydration

C. Cell lysis

D. High blood pressure

Question #9

Transporters in the membrane undergo transitions between different conformations depending on whether the substrate-binding pocket is empty or occupied.

A. TRUE

B. FALSE

Question #10

Membranes contain a wide diversity of lipids, including

A. cholesterol, phosphoglycerides and sphingolipids

B. triglycerides, cholesterol and phosphoglycerides

C. cholesterol, triglycerides and sphingolipids

D. phosphoglycerides, sphingolipids and triglycerides

Question #11

Most of the functions of a cell membrane are performed by

A. glycolipids

B. triglycerides

C. cholesterol

D. proteins

Question #12

What level of structure in proteins is held together by R group interactions between different polypeptides?

A. primary structure

B. quarternary structure

C. tertiary structure

D. secondary structure

Question #13

Structure plays a role in protein function but does not play a role in carbohydrate function.

A. FALSE

B. TRUE

Question #14

Which of the following statements about hydrogen bonds is true?

A. They are weak attractive interactions

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

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

D. They can occur between most polar molecules.

Question #15

Molecular chaperones are “helper proteins” to prevent nonselective interactions during protein folding in order to achieve proper 3D conformation.

A. FALSE

B. TRUE

Question #16

The use of hydrogen bonds to make alpha helices and beta sheets is what level of protein folding.

A. Secondary

B. Primary

Question #17

Which interaction is most important in enhancing the solubility of macromolecules in water?

A. hydrogen bonds

B. hydrophobic interactions

C. van der Waals forces

D. nonpolar covalent bonds

E. Both hydrophobic interactions and nonpolar covalent bonds

Question #18

Proteins are often composed of two or more distinct modules that fold up independently of one another. They often represent parts of a protein that function in a semi-independent manner. These modules are called

A. domains

B. quaternary structure motifs

C. protein motifs

D. functional groups

Question #19

Denaturation of a protein is due to the breaking of all covalent and non-covalent bonds in order to unfold a protein.

A. FALSE

B. TRUE

Question #20

Where are hydrophobic interactions most likely to occur?

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

Question #21

A disruption of all non-covalent bonds leading to protein loss of function is called what?

A. Denatured

B. Natured

Question #22

Identify the technique: Method to separate cell components into fractions.

A. Differential Rotation

B. Differential Centrifugation

Question #23

Why are proteins separated on an SDS polyacrylamide gel equally attracted to the positive electrode?

A. They are all the same molecular weight.

B. They carry a relatively uniform negative charge distribution.

C. They carry a relatively uniform positive charge distribution.

D. They all have the same degree of hydrophobicity.

E. They are all the same size.

Question #24

Which of these is not part of cell theory?

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

Question #25

What is true about cells grown in culture?

A. 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.

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

C. 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.

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

Question #26

Cell size is limited by the fact that its ability to exchange nutrients is proportional to its surface area.

A. TRUE

B. FALSE

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