b2

Question 1

What is a stem cell

Answer 1

undifferentiated cells

Question 2

what happens in the first stage of mitosis?

Answer 2

interphase
cell grows
organelles increase in number
DNA is replicated

Question 3

what happens in the 2nd stage of cell division?

Answer 3

mitosis
chromosomes line up at the equator of the cell and the cell fibres pull each chromosome to either side of the cell

Question 4

what happens on the final stage of cell division

Answer 4

cytokinesis
2 identical daughter cells form after the cytoplasm and cell membranes divide

Question 5

name 3 types of stem cells

Answer 5

embryonic stem cells
meristems in plant roots and stems
adult stem cells

Question 6

describe embryonic stem cells

Answer 6

form when an egg and sperm fuse to form a zygote
these cells can differentiate into any type of body cells
these could be specialised into insulin making cells for those suffering of diabetes

Question 7

describe adult stem cells

Answer 7

found in bone marrow–> can differentiate into many types of cells

Question 8

describe meristems

Answer 8

found in roots and shoots
throughout their entire life they can differentiate into any type of plant