Questions about cell nucleus?

Question

1. Why is the nucleus commonly called the "control center" of a cell
2. What are the two different forms DNA is found in?

Answer 1

1. The nucleus is the control center of the cell because it contains all the information necessary for the functioning of the cell.

2. DNA have different forms like : B form, A form and Z form,.
The common type of DNA is B form,where the helix makes a turn every 3.4 nm, and the distance between two neighboring base pairs is 0.34 nm. Hence, there are about 10 pairs per turn.
Z DNA is zigzag and left handed.

Answer 2

1. It's called the control centre because it controls the activity of the cell, in eukaryotic cells (all plant and animal cells). It's the largest organelle, and has a double membrane with lots of pores, so secretery substances can enter and leave the cell. In the nucleolus of the cell, ribosomes (synthesis of protein) are made. Chromosomes are also found in the nucleus. DNA is copied to Messenger Ribonucleic Acid in the nucleus (see below).

2. DNA (deoxyribonucleic acid) and mRNA (messenger ribonucleic acid) are found in the nucleus. DNA is copied to mRNA, which exits the nucleus, and binds to ribosomes (remember these synthesis and distribute proteins). Once this has happened, amino acids are put into the correct sequence coded by mRNA to form enzymes
hope that helped =D

Answer 3

1. The nucleus contains the DNA, and the DNA is what controls all the activities of the cell.
2. DNA is in the form of chromatin during most of the cell's life. Chromatin is loose strings of DNA. When the cell is preparing to divide, chromatin is wrapped and twisted into the form of chromosomes. Chromosomes are less likely to get tangled up and damaged while they are being moved around the cell in mitosis or meiosis. So your answers are chromatin and chromosomes.