Lysosomes

Question 1

What are lysosomes?

Answer 1

Lysosomes are membrane-bound organelles that contain enzymes.

Question 2

What is the function of lysosomes?

Answer 2

Lysosomes defend a cell from invading bacteria and

viruses. They also break down damaged or worn-out cell parts.

Question 3

What is special about lysosomes?

Answer 3

Lysosomes tend to be numerous in animal cells. The or presence in plant cells is still questioned by some scientists, but others assert that plant cells do have lysosomes, though fewer than are found in animal cells.

Question 4

What is about the lysosomal enzymes?

Answer 4

Lysosomal enzymes are made in the rough endoplasmic reticulum in an inactive form. Vesicles pinch off from the ER membrane, carry the enzymes, and then fuse with the Golgi apparatus.

Question 5

What happens with the lysosomal enzymes in the Golgi apparatus?

Answer 5

In the Golgi apparatus the enzymes are activated and
packaged as lysosomes that pinch off from the Golgi membrane. The lysosomes can then engulf and digest targeted molecules.

Question 6

What happens when a molecule is broken down?

Answer 6

When a molecule is broken down, the products pass through the lysosomal membrane and In to the cytoplasm, where they are used again.

Question 7

What do lysosomal enzymes need to destroy cell components?

Answer 7

Because lysosomal enzymes can destroy cell components, they must be surrounded by a membrane that prevents them from destroying necessary
structures.

Question 8

Which other methods do cell use to protect themselves from destructive enzymes?

Answer 8

An example:

1. The enzymes do not work ad well in the cytoplasm as they do inside the lysosome.

Question 9

REMEMBER!

Answer 9

Lysosomes digest and recycle foreign materials or worn-out parts!