T2 B6 HV

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

B6 Cell division

• Stuff on your desk

       Book, notebook, pencilcase

• Bag on the floor
• Read pgs. 122-124

Goals

• You can describe how a cell divides
• You can name the features of stem cells

Today

• Recap
• Cell division
• Stem cells
• Time for hw
  
• End

A person who researches Stomach problems, mostly works on the level of:

1. Cell
2. Tissue
3. Organ
4. A, B and C combined

What is NOT something plant roots do

1. Making food
2. Storing food
3. Taking up water
4. Anchoring the plant

You look at cells from the eye of an unknown organism. You count 36 chromosomes in its nucleus. How much chromosomes do you expect to find in a cell of this organisms feet?

1. Less
2. more
3. the same amount
4. It's impossible to tell

What part of a cell stores water?

1. Cytoplasm
2. Nucleus
3. Vacuole
4. Cell membrane

Cell division

Cell division is happening constantly in your body:

• 3,5 kg of new skincells every year
• 200.000.000.000 new bloodcells every day

Cells also die a lot!

• More new cells than dead cells > growth

Cell cycle

parent cell

daughter cell

daughter cell

Cell cycle

• 1 daughter cell > specialised cell > heartcell, musclecell, bloodcell, etc.
• 1 dochtercel > stem cell > parent cell
• Stem cells can divide into new cells
• Stem cells don't specialise

skin cells

nerve cell

blood cells

stem cell

A human stem cell divides.
The daughtercells are called cell A and cell B.
How many chromosomes are in cell A? (only use numbers)

Cell A is a stem cell.
Cell A divides into cell B and C.
Cell B becomes a liver cell.
What happens with cell C?

1. Becomes a liver cell
2. Becomes a body cell
3. Becomes a stem cell
4. Impossible to tell

Let's work!

Do the assignments of 2.6!

Done? Do your homework for an other subject. 

Tidy Duty

Today these people are on tidy duty

• Desks: empty and straight
• Chairs:  underneath the desks
• Floor: no rubbish