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Lesson Worksheet: Structure of Cell Membranes Biology

In this worksheet, we will practice describing the structure and function of membranes and describing how factors affecting membrane permeability can be investigated.


Eukaryotic cells contain many organelles with internal membranes.

Which of the following organelles does not have membranes as part of its structure?

  • AThe lysosome
  • BThe endoplasmic reticulum
  • CThe nucleus
  • DThe Golgi apparatus
  • EThe ribosome

Internal membranes provide areas with different conditions for specific reactions to take place within a cell.

What term describes this structural adaptation of eukaryotic cells?

  • ACytodivision
  • BSegregation
  • CCompartmentalization
  • DInsulation
  • EClassification


Which of the following conditions is most likely to damage a cell membrane and increase its permeability?

  • AHypertonic solutions
  • BOrganic solvents
  • CLow temperatures (4–10C)
  • DPolar solvents


The inner membrane of a mitochondrion is highly folded, as shown in the figure.

How does this feature help the mitochondrion perform its function?

  • AIt increases the surface area for the reactions of respiration.
  • BIt decreases the permeability of the membrane so the reactants of respiration stay inside.
  • CIt increases the surface area for the reactions of photosynthesis.
  • DIt reduces the size of the organelle so it fits in the cytoplasm.


The figure represents a component of all cell membranes.

What molecule does the figure represent?

  • ACholesterol
  • BSugar
  • CGlycoprotein
  • DPhospholipid
  • EProtein

What chemical property does the blue part of the molecule have?

  • AIt is hydrophobic.
  • BIt is hydrophilic.
  • CIt is ionic.
  • DIt is inorganic.

What is X?

  • AAn unsaturated fatty acid
  • BAn alcohol group
  • CA phosphate group
  • DCholine
  • EA saturated fatty acid


Which of the following statements about the structure of biological membranes is correct?

  • ACell membranes are formed from a single layer of phospholipids and a single layer of glycolipids, connected by hydrophobic tails.
  • BCell membranes are formed from a single layer of phospholipids, connected by their hydrophobic heads.
  • CCell membranes are formed from two layers of phospholipids, where the hydrophilic phospholipid tails link together in a matrix.
  • DCell membranes are formed from two layers of phospholipids, where the hydrophilic phospholipid heads face outward.


Which of the following is a primary function of the cell membrane?

  • ATo prevent the entry and exit of substances into and out of the nucleus
  • BTo synthesize, store, and transport proteins
  • CTo separate the components of the cell from the surrounding medium or environment
  • DTo provide support and structure to the cell


Which molecule found within a phospholipid bilayer of animal cells provides structural support to the membrane?

  • ACellulose
  • BActin
  • CMyosin
  • DStarch
  • ECholesterol


Hydrogen cyanide is a toxic small nonpolar molecule that is released by some plants to deter herbivores.

Cyanide crosses membranes and inhibits a key process in respiration.

What is the most likely way for this molecule to pass through membranes?

  • AIt diffuses through the phospholipid bilayer.
  • BIt enters by endocytosis.
  • CIt diffuses in the cell using a carrier protein.
  • DIt enters through a channel protein.


Which of the following is common between all prokaryotes and all eukaryotes?

  • ACell wall
  • BCell membrane
  • CCentrosomes
  • DNucleus


Which of the following is true about the cell membrane?

  • AIt has a dry nature.
  • BIt has a gaseous nature.
  • CIt has a fluid nature.
  • DIt has a solid nature.

This lesson includes 28 additional questions for subscribers.

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