GENERAL HISTOLOGY

INTRODUCTION

CELL STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
This organelle is in all eukaryotic cells. It is the control center of the cell because it holds the DNA.
A
Mitochondria
B
Nucleus
C
Chloroplasts
D
Ribosomes
Explanation: 

Detailed explanation-1: -The presence of a nucleus is the principal feature that distinguishes eukaryotic from prokaryotic cells. By housing the cell’s genome, the nucleus serves both as the repository of genetic information and as the cell’s control center.

Detailed explanation-2: -The nucleus is often referred to as the control center, or brain, of the cell and contains the DNA, or genetic material. The nucleus is surrounded by the nuclear envelope.

Detailed explanation-3: -Nucleus and Nucleolus The nucleus, formed by a nuclear membrane around a fluid nucleoplasm, is the control center of the cell. Threads of chromatin in the nucleus contain deoxyribonucleic acid (DNA), the genetic material of the cell.

Detailed explanation-4: -Because nucleus contains a material called gene which controls all activities of cell and its characteristics. Cell nuclei contain most of the cell’s genetic material, organized as multiple long linear DNA molecules in complex with histones, to form chromosomes.

Detailed explanation-5: -Nucleus acts as ‘brain’ of the cell. It regulates and controls all the cell activities.

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