Tag: cell-the basic unit of life

• The nucleus of a cell is separated from the cytoplasm by a double membrane known as the nuclear envelope.
  
• Prokaryotes do not have genomic DNA that is concentrated and localized to a small area within the cell called nucleoid region, thus it is absent in them.

• Whereas, a eukaryotic cell contains all the organelles and nucleus which is separated from the cytoplasm by the nuclear envelope.
• The correct answer is OPTION C.

The thread like structure present in the nucleus are called the chromosomes or the chromatin, when the degree of condensation is very less.

• RNA is found everywhere- nucleus, nucleolus, mitochondria, chloroplasts, ribosomes, cytoplasm, etc. RNAs are 3 different types- mRNA, tRNA and rRNA. mRNA and tRNA are found in the cytoplasm and rRNA in the nucleus.
• The ribosomes can be free within the cytoplasm of a cell or attached to the endoplasmic reticulum but do not present inside the nucleus. RNA and ribosomes act together resulting in the synthesis of proteins.

• The cell is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life. 
• Cells are often called the "building blocks of life". 
•  Cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic, which do not. 
• Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular. 
• Hence, the cell of all living organisms have a nucleus is correct.
• So, the correct answer is 'cell of all living organisms has a nucleus'.

Within the nucleus is a small subspace known as the nucleolus. It is not bound by a membrane, so it is not an organelle. This space forms near the part of DNA with instructions for making ribosomes, the molecules responsible for making proteins.

Nucleus is a double membrane covered protoplasmic body that contains heredity information. With the help of grafting experiments on Acetabularia, Hammerling (1953) proved that nucleus is a storehouse of hereditary information.

The nucleus is two layered structure, it is a membrane-enclosed structure found in eukaryotic cells. It contains most of the cell's genetic material. The function of the nucleus is to maintain the integrity of the genes and to control the activities of the cell by regulating gene expression.

The nucleus is the most important and the largest component of the cell. Nucleus regulates the four main functions of the cell which are protein synthesis, cell division, growth and differentiation are carried out by the nucleus. Nucleus regulates all these cellular activities by controlling the enzymes required for cellular processes. Enzymes are proteins and protein synthesis is controlled by nucleus as mRNA required for protein synthesis is made from DNA which is situated in the nucleus.