Answer:
b) In nature, only embryonic stem cells give rise to all the different types of cells in the organism.
Explanation:
Embryonic stem cells are special type of cells formed in the embryonic stage of the life cycle of a living organism. Embryonic stem cells are capable of differentiating into every other type of cells that exists in an organism. Besides the embryonic stem cells, other types of stem cells exist, one of which is the adult stem cell.
The adult stem cell is a type of stem cell found in the tissues of adult organisms as opposed to those found in the embryo. One substantial difference between the embryonic and adult stem cells is that the embryonic stem cells are the only type of stem cells capable of giving rise to all the different types of cells in an organism i.e. embryonic stem cells are capable of differentiation while adult stem cells are not.
A) The DNA replicates, producing two copies of each chromosome.
Answer:
I started out as glucose, got converted to pyruvate, after which I got oxidised by Oxygen to become CO2
Explanation:
My name is CO2, and I started out as glucose from pure honey. I got eaten by a little child when I was two weeks old, and I had to go through the dreadful process of aerobic respiration in the child's body.
My glucose molecules were broken down into pyruvate, and I stayed that way for a while, as I made my way to the mitochondria of the child's cells. Once I got to the mitochondria, I met my old friend oxygen, who reacted with me to turn me into the molecule I am today - C02.
If you want to know how I escaped the child's body, that's easy - I simply snuck out his nose while he was breathing one cold dark night.
TOPOGRAPHY AND ELEVATION .
