PNB Exam 2 Part 3 questions with
complete solutions
• Can you explain how cellular compartments are created? - correct answer ✔✔ -Fluid mosaic
model describes the movement and flexibility of membrane; specifically the phospholipids-the
membrane contains fats and lipids-Phospholipids have...----Tails are fatty acids that are
hydrophobic and nonpolar---Heads that are glycerol, polar, and hydrophilic
• Do you know the components of plasma membrane and their functions? - correct answer ✔✔
-Phospholipids: hydrophilic head and hydrophobic tail
-Protein: peripheral, attach to either inner/outer face of membrane. Intergral, pass through
membrane on both side
-function: physical barrier, exchange, communication, and attachment
• Can you describe the process of simple diffusion, and the factors that affect it, using
examples? - correct answer ✔✔ -its passive process
-slow over big distances, fast in short distance
-increases when temp goes up (heat increases molecular movement)
-can happen in an open system (i.e beaker/cellular compartment)
-Requires concentration gradient
• Are you able to classify cellular transport processes as being active or passive? - correct
answer ✔✔ -Passive: doesn't require energy, materials move from regions of high concentration
to low
-Active: requires energy, moves from low to high
• Can you describe channel mediated transport and provide examples? - correct answer ✔✔ -
ion channel are selective
complete solutions
• Can you explain how cellular compartments are created? - correct answer ✔✔ -Fluid mosaic
model describes the movement and flexibility of membrane; specifically the phospholipids-the
membrane contains fats and lipids-Phospholipids have...----Tails are fatty acids that are
hydrophobic and nonpolar---Heads that are glycerol, polar, and hydrophilic
• Do you know the components of plasma membrane and their functions? - correct answer ✔✔
-Phospholipids: hydrophilic head and hydrophobic tail
-Protein: peripheral, attach to either inner/outer face of membrane. Intergral, pass through
membrane on both side
-function: physical barrier, exchange, communication, and attachment
• Can you describe the process of simple diffusion, and the factors that affect it, using
examples? - correct answer ✔✔ -its passive process
-slow over big distances, fast in short distance
-increases when temp goes up (heat increases molecular movement)
-can happen in an open system (i.e beaker/cellular compartment)
-Requires concentration gradient
• Are you able to classify cellular transport processes as being active or passive? - correct
answer ✔✔ -Passive: doesn't require energy, materials move from regions of high concentration
to low
-Active: requires energy, moves from low to high
• Can you describe channel mediated transport and provide examples? - correct answer ✔✔ -
ion channel are selective
