Chapter 8.6

Question 1

Development depends on the balance of what 2 processes

Answer 1

a balance between cell division and programmed death( apoptosis)

Question 2

The difference between appoptosis and necrosis

Answer 2

apoptosis : is programmed death resulting from precisely coordinated series of events that dismantle a cell.
Necrosis: sudden traumatic and disorderly accidental death of a cell.

Question 3

2 main function of apoptosis in animals

Answer 3

1. elimates ecess cells ( carves out functional structures like finger, toes, nostrils and ears)
2. weed out defective aging or defective cells that might harm an organism ( peeling skin that follows a sunburn preventing skin cancer)

Question 4

Apoptosis in plant cells

Answer 4

plant cells are digested by enzymes by their own vacuoles; when the vocuole bursts the cell dies. Plants also use a form of cell death to kill cells infected by fungi or bacteria, limiting the spread of pathogen.

Question 5

. What events happen in a cell undergoing apoptosis?

Answer 5

A cell undergoing apoptosis first receives a signal at a membrane protein called a death receptor. The signal triggers the release of enzymes that destroy the cell from within. Eventually, immune system cells engulf the dying cell, degrading or recycling its components.

Question 6

Describe two functions of apoptosis

Answer 6

Apoptosis carves out excess cells to form a body structure, and it eliminates damaged or aging cells.