Biology Quiz

Which of the following best defines the term “exocytosis”?

• The discharge of ions or small molecules from a cell by protein

  pumps in the cell membrane

• The uptake of material at one domain of a cell’s surface and its

  discharge from the opposite side of the cell

• The process by which proteins move from one cytoplasmic

  compartment to another

• The discharge of proteins in cytoplasmic vesicles from a cell

  following fusion of the vesicles with the plasmalemma

• Diffusion of lipid-soluble molecules from a cell across the cell

  membrane

In transmission EM preparations of cells the cell membrane often appears as a trilaminar structure having two parallel dark-staining components on either side of an unstained middle layer. This central poorly stained region of the membrane is primarily responsible for which of the following functions?

• Creation of a barrier to water-soluble molecules

• Binding by cellular receptions to specific ligands

• Catalyzing Transport of ion membrane-associated activities

• Connections to the cytoskeleton

• Transport of ions

Which of the following has a rigid wall composed of 13 protofilament strands?

• Keratin

• Lamin A

• Microfilament

• Microtubule

• Neurofilament

Which one of the following transport processes requires energy?

• Facilitated diffusion

• Passive transport

• Active transport

• Simple diffusion

Which of the following cytoskeletal components is associated with kinesin?

• Keratin

• Lamin A

• Microfilament

• Microtubule

• Neurofilament

Which of the following provides structural support to astrocytes?

• Keratin

• Lamin A

• GFAP

• Microtubule

• Neurofilament

In a light microscope for histology, resolution and magnification of cells are largely dependent on which component

• Condenser

• Objective lens

• Eyepiece or ocular lens

• Specimen Slide

• The control for illumination intensity

lipid rafts function to

• increase fluidity of the lipid bilayer

• decrease fluidity of the lipid bilayer

• facilitate the diffusion of ions through the lipid bilayer

• assist in the transport of hormones across the lipid bilayer

• bind extracellular matrix molecules

The cell membrane consists of various components, including integral proteins. These integral proteins

• are not attached to the outer leaflet

• are not attached to the inner leaflet

• include transmembrane proteins

• are preferentially attached to the E-face

• function in the transport of cholesterol-based hormones

Which of the following consists of globular actin monomers linked into a double helix?

• Keratin

• Lamin A

• Microfilament

• Microtubule

• Neurofilament