Which of the following is considered to be the control center or "brain" of a cell, containing numerous chromosomes for cellular reproduction?
A. Gene
B. Cell membrane
C. Nucleus
D. Cytoplasm
C. Nucleus
The correct answer is C. Nucleus. The nucleus is considered to be the control center or "brain" of a cell. It contains numerous chromosomes, which carry genetic information and are involved in cellular reproduction. The gene (option A) represents a specific segment of DNA responsible for a particular trait. The cell membrane (option B) is the outer boundary of the cell. The cytoplasm (option D) is the fluid-like substance inside the cell, excluding the nucleus.
The correct answer is C. Nucleus.
To arrive at this answer, let's break down and understand each option:
A. Gene: A gene is a segment of DNA that contains the instructions for building and maintaining cells. While genes are involved in cellular reproduction, they are not the "control center" or "brain" of the cell.
B. Cell membrane: The cell membrane is a thin, semi-permeable barrier that surrounds the cell, separating its internal environment from the external environment. It controls the movement of substances in and out of the cell, but it is not the control center or brain of the cell.
C. Nucleus: The nucleus is often referred to as the control center or "brain" of the cell. It contains DNA, which carries genetic information in the form of chromosomes. The nucleus regulates cellular functions and plays a crucial role in cellular reproduction.
D. Cytoplasm: Cytoplasm is the gel-like substance that fills the cell and surrounds the nucleus. It contains various organelles, such as mitochondria, endoplasmic reticulum, and ribosomes. While cytoplasm is involved in various cellular processes, it is not considered the control center or brain of the cell.
Therefore, the correct answer is C. Nucleus, as it contains numerous chromosomes and serves as the control center or "brain" of the cell.