SB2- cells and control

Question 1

what do out cells have to do in order for us to grow and survive?

Answer 1

divide

Question 2

what is asexual reproduction?

Answer 2

when organisms use mitosis to reproduce

Question 3

what happens in interphase?

Answer 3

• the DNA is spread out in long strings
• it has to grow and increase the amount of subcellular organisms
• duplicates DNA
• form X-shaped chromosomes

Question 4

give two examples of subcellular structures

Answer 4

• mitochondria

- ribosomes

Question 5

explain what happens in prophase

Answer 5

the chromosomes condense, the membrane around the nuclease breaks down and the chromosomes lie free in the cytoplasm

Question 6

explain what happens in metaphase

Answer 6

the chromosomes line up at the centre of the cell

Question 7

explain what happens in anaphase

Answer 7

spindle fibres pull apart the chromosomes, then the chromatids split to each side of the cell

Question 8

explain what happens in telophase

Answer 8

membranes form around the chromatids which is now the nucleus of the new cell

Question 9

what is cytokinesis?

Answer 9

the cytoplasm and the cell membrane divide to form two new separate cells

Question 10

what is the formula to work out the number of cells?

Answer 10

number of cells = 2n

n= number of divisions

Question 11

if you start with one cells after 4 divisions of mitosis how many cells will there be?

Answer 11

2 to the 4 = 2x2x2x2 = 16