1.2bi Intracellular Membranes

Why do eukaryotic cells require a system of internal membranes?

• To store genetic material

• To increase the total area of membrane for vital functions

• To provide structural support

• To produce energy

Which organelle forms a network of membrane tubules continuous with the nuclear membrane?

• Golgi apparatus

• Lysosome

• Endoplasmic reticulum

• Mitochondrion

What distinguishes rough endoplasmic reticulum (RER) from smooth endoplasmic reticulum (SER)?

• RER has ribosomes, SER does not

• SER has ribosomes, RER does not

• RER is not connected to the nuclear membrane

• SER is involved in protein synthesis

Which of the following best describes the Golgi apparatus?

• A network of membrane tubules

• A series of flattened membrane discs

• A double-membraned organelle

• A spherical organelle containing DNA

How are the discs of the Golgi apparatus arranged?

• Randomly scattered in the cytoplasm

• Connected, allowing molecules to move within the apparatus

• Stacked with no connections

• Surrounded by ribosomes

What is the primary function of lysosomes?

• Protein synthesis

• Energy production

• Digestion of macromolecules

• DNA replication

Which type of enzymes are found in lysosomes?

• Ligases

• Hydrolases

• Polymerases

• Kinases

What is the pH like inside lysosomes?

• Neutral

• Alkaline

• Acidic

• Variable

What is the main function of vesicles in eukaryotic cells?

• DNA replication

• Transporting materials between membrane compartments

• Producing ribosomes

• Synthesising ATP

What is the structure of a vesicle?

• A protein shell

• An aqueous solution enclosed by a lipid bilayer

• A double-stranded DNA molecule

• A single layer of carbohydrates