Cell The Unit Of Life

According to fluid mosaic model of Singer and Nicolson, the plasma membrane has a continuous lipid bilayer having integral protein molecules embedded at places.

Golgicomplex consists of three membranous components i.e., cisternae, vesicles and vacuoles. The main function of Golgi body is the secretion of metabolites, proteins, polysaccharides, formation of cell wall during cell division and acrosome formation.

The correct answer is D:all of the above
Cilia are small, hair like structures that are found in bacteria and have a role in movement, sensory perception etc. They are short and are 5-10
micrometres long. They are present in numerous numbers and help in sweeping movements. They have tubulin protein subunits.
Therefore, all the options given in the question are correct.

Ribosomes are rib nucleoprotein particles. Ribosomes are the smallest cell organelle measuring A in diameter, they are not bound by any unit membrane. Each ribosome is made up of two unequal subunits.

Plants cells do not have any centrioles and they are seen only in animal cells. It is a complex called the centrosome. Plants cells contain other organelles like the cell wall as the covering as well as vacuole and chloroplast, which has a high concentration of chlorophyll.

The correct answer is A:ribosome
It is covered with ribosomes. The endoplasmic reticulum can be smooth or rough. Rough endoplasmic reticulums have ribosomes that help in the protein synthesis, and also help in their transportation. It is also called RER. Another is the smooth endoplasmic, then helps in lipid synthesis and detoxification.

The branch of Biology dealing with structure (Cytology) function and reproduction of cell is called Cell biology.

Purkinje coined the term protoplasm. Protoplasm is a complex, granular, elastic, viscous and colourless substance. It is termed as polyphasic colloidal system. Huxley called it Physical basis of life.

Mitochondria are called power house of cell, as the food material is gradually oxidised and energy generated is stored in the form of ATP. The enzymes for Krebs cycle (aerobic respiration) and fatty acid oxidation are found in matrix of mitochondria.

All cells are enclosed by a thin, film-like liable membrane called the plasma membrane or plasmalema. The main function of plasma membrane is to regulate the flow of materials into and out of the cell (osmoregulation). The membrane is selectively permeable.

Lysosomes are the spherical, tiny sacs bounded by a single membrane. These are found in most eukaryotic cell but are more abundant in animal cells. Lysosomes are reservoirs of hydrolytic enzymes used for the controlled intracellular digestion of macromolecules.

Bacterial cells have a chemically complex cell envelope. The cell envelope consists of a tightly bound three-layered structure, i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane. The glycocalyx is made up of sugar and proteins.

Ribosomes are the granular structures, and are composed of RNA and proteins. These are not surrounded by any membrane.

Golgi bodies or apparatus of plant and animal cell are structurally similar organelles, which is dise-shaped and consists of central flattened plate like compartment or cisternae, peripheral interconnecting tubules, and vesicles. There are about cisternae in a stack and are about in diameter. Hence option to is correct answer.

Perinuclear space is present in endoplasmic reticulam. The cytoplasmic matrix is traversed by a complex network of interconnecting membrane bound cavities or vacuole, which are concentrated with endoplasmic portion of cytoplasm and therefore are termed as endoplasmic reticulam. These extensively ramification structure are contineous with outer membrane of nucleus, hence contain perinuclear space, i.e., the space between membranes of nucleus and endoplasmic reticufam is interconnected with each other. Cytoplasm of cell is enveloped internally by nuclear membrane and externally by plasma membrane. Golgi complexes are parallel arranged flattened membrane bound vesicles which lack ribosomes.

Rough endoplasmic reticulam (PER) is actively involved in protein synthesis, the membrane of RER contain ribosomes and take part in metabolism of protein. These cell organelle are abundantly found in pancreas and fibroblast. While synthesis of lipid is carried out by smooth endoplasmic reticulam.