Endomembrane system

objectives

By the end of the lesson, You will be able to:

1. Identify the main components of the endomembrane system
   (nuclear envelope, rough ER, smooth ER, Golgi apparatus, vesicles, lysosomes, plasma membrane)

2. describe the function of compartmentalization in eukaryotic cells

Open Ended

Why is the endomembrane system important for the functioning of eukaryotic cells?

Multiple Choice

Which of the following organelles is NOT part of the endomembrane system in eukaryotic cells?

• Nucleus

• Mitochondria

• Golgi apparatus

• Lysosomes

Multiple Choice

What is the main function of the nucleus in a cell?

• To hold the DNA and organize it into chromosomes

• To synthesize proteins

• To produce energy

• To transport materials across the cell

Multiple Select

Which of the following statements about the nuclear envelope are correct?

• It is made of two lipid bilayers

• It is perforated by nuclear pores

• It synthesizes ribosomes

• It allows material to enter and leave the nucleus

Open Ended

Explain how the structure of the endoplasmic reticulum (ER) supports its function in the cell.

Multiple Choice

What happens to the proteins synthesized by the rough ER?

• They are always secreted from the cell

• They are incorporated into the cell membrane, secreted, or become lysosomal enzymes

• They are only used inside the nucleus

• They are broken down immediately

Multiple Choice

What is the difference between bound ribosomes and free ribosomes?

• Bound ribosomes are attached to the ER, while free ribosomes are suspended in the cytoplasm

• Bound ribosomes are found in the nucleus, while free ribosomes are in the ER

• Bound ribosomes synthesize DNA, while free ribosomes synthesize RNA

• Bound ribosomes are only found in plant cells

Multiple Choice

Which of the following is a main function of the smooth endoplasmic reticulum (ER)?

• Synthesizing lipids

• Producing ATP

• Storing genetic information

• Transporting oxygen

Multiple Select

Which of the following statements about the Golgi apparatus are correct?

• It modifies proteins received from the ER.

• It produces hydrolytic enzymes directly.

• It has a cis face and a trans face.

• It sorts and targets molecules for different parts of the cell.

Open Ended

Explain how lysosomes contribute to cellular recycling and nutrient release.

Multiple Select

Which of the following are functions of lysosomes in the cell?

• Digesting macromolecules

• Recycling worn-out organelles

• Synthesizing lipids

• Participating in apoptosis

Multiple Choice

What role do lysosomes play during apoptosis?

• They release hydrolytic enzymes to break down cell structures.

• They synthesize new proteins for the cell.

• They transport oxygen to mitochondria.

• They replicate DNA for cell division.

Multiple Choice

Which of the following is a function of contractile vacuoles in freshwater protists?

• Pumping excess water out of cells

• Storing nutrients

• Digesting food particles

• Producing energy

Multiple Select

Which of the following are true about central vacuoles in plant cells?

• They store water, nutrients, pigments, and waste products.

• They are not found in animal cells.

• They are responsible for cellular respiration.

• They help maintain cell structure.

Open Ended

Explain how the endomembrane system contributes to the compartmentalization of cellular processes in eukaryotic cells.

Open Ended

How do the different organelles of the endomembrane system work together to maintain cellular function?

Multiple Choice

Which of the following organelles is NOT part of the endomembrane system?

• Nucleus

• Mitochondria

• Golgi apparatus

• Lysosomes