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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.

Q1:

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

Q2:

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

Q3:

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.

Q4:

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

Q5:

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.

Q6:

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

Q7:

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

  • ACellulose
  • BActin
  • CMyosin
  • DStarch
  • ECholesterol

Q8:

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.

Q9:

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

  • ACell wall
  • BCell membrane
  • CCentrosomes
  • DNucleus

Q10:

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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