Tag: membranous and non-membranous organells

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.

The nucleolus is the largest structure present in the nucleus. Ribosome synthesis and assemblage occurs in nucleolus region. 
Chromosomes are not present in the cytoplasm. 
Golgi apparatus does not possess chromosomes. 
The nucleus is the double membrane bound structure of the cell in which most of the genetic material is present in the form of chromosomes. The nucleus is present in eukaryotic cells. Thus, the correct answer is option A.

The nucleus is the membrane bound important structure of the cell. Nucleus regulates all the cellular activities by controlling the enzymes required for cellular processes. It contains genetic information in the form of genes located in the chromosomes. It brings about growth of the cell by directing the synthesis of structural proteins. It also controls all the metabolic activities of the cell.
So, the correct answer is option D.

Deoxyribonucleic acid (DNA) encodes the genetic instructions which are used in development and functioning of all living organisms. Ribonucleic acid (RNA) is one of the types of nucleic acid. Both, DNA and RNA are found in the nucleus. DNA is involved in coding the genetic information. It is present in the nucleoplasm of the nucleus in the tightly coiled form called as chromosomes. RNA is present in the nucleolus of the nucleus and involved in protein synthesis.
So, the correct answer is option A.

Nucleus is the membrane bound structure of the cell. It contains the majority of the cell's genetic material, i.e., DNA in the form of DNA-protein complex called as chromatin. DNA is present in the nucleoplasm of the nucleus in the tightly coiled form called as chromosomes. 
So, the correct answer is option A.

The nucleus is the largest and important part of the cell. It surrounded by the two layers of membrane. These membranes separates the nuclear content to get mixed with cytoplasm. Cytoplasm is the proteinaceous fluid in the cell which holds organelles like ribosomes, mitochondria, ER etc. Thus, the correct answer is option B.

A nuclear membrane, also known as the nuclear envelope, is a double lipid bilayer membrane, which surrounds the nucleus containing genetic material and nucleolus in eukaryotic cells. The nuclear membrane consists of two lipid bilayers- the inner nuclear membrane and the outer nuclear membrane and consists pores called as nuclear pores for the transportation of DNA, RNA and proteins. Thus, the correct answer is option B.