Cell Biology

Membrane Carbohydrate

Membrane Carbohydrate Structure

Membrane Carbohydrate Cell membranes are selective barriers that separate individual cells and cellular compartments. Membranes are assemblies of carbohydrates, proteins, and lipids held together by binding forces. Carbohydrates are covalently linked to proteins (glycoproteins) or lipids (glycolipids) and also an important part of cell membranes, and function as adhesion and address loci for cells. The Fluid Mosaic Model describes membranes as a … Read moreMembrane Carbohydrate

Nucleosome Model of Chromosome

Nucleosome Model of Chromosome

Nucleosome Model of Chromosome The chromosomes are the nuclear components of the special organization, individuality, and function that are capable of self-reproduction and play a vital role in heredity, mutation, variation and evolutionary development of the species. Each chromosome is made up of DNA tightly coiled many times around proteins that support its structure. The proteins that bind … Read moreNucleosome Model of Chromosome

Difference between active transport and passive transport

Difference between active transport and passive transport

Difference between active transport and passive transport Active and passive transport are the two main biological process which plays an important role in supplying nutrients, water, oxygen, and other essential molecules to cells and also by removing waste products. Both active and passive transport works for the same cause, but with different movement. Active transport … Read moreDifference between active transport and passive transport

Sandwich (Davson–Danielli) model of cell membrane

Sandwich (Davson–Danielli) model

Sandwich (Davson–Danielli) model of cell membrane The Davson–Danielli model (or paucimolecular model) was a model of the plasma membrane of a cell, proposed in 1935 by Hugh Davson and James Danielli. The model describes a phospholipid bilayer that lies between two layers of globular proteins and it is trilaminar and lipoproteinous. It was the first model that attempted to describe the position of proteins within the … Read moreSandwich (Davson–Danielli) model of cell membrane

Secretory Vesicles

Secretory Vesicles

Secretory Vesicles Vesicles are small, membrane-enclosed sacs that store and transport substances to and from one cell to another and from one part of a cell to another. The small, spherical compartment of vesicles is separated from the cytosol by at least one lipid bilayer. Because vesicles are made of phospholipids, they can break off of and … Read moreSecretory Vesicles

Fluid Mosaic Model

Fluid mosaic model of a cell membrane

Fluid Mosaic Model The plasma membrane, also known as the cell surface membrane or plasmalemma, defines the boundary of the cell. They are a special type of membranes which are lipid structures that separate the cell from its environment. In composition, it is a phospholipid bilayer with embedded proteins that enclosing every living cell. It … Read moreFluid Mosaic Model

Microvilli- Structure and Functions

Microvilli- Structure and Functions

Microvilli- Structure and Functions Microvilli, in the most simplistic terms, are tiny little microscopic projections that exist in, on, and around cells. They can exist on their own or in conjunction with villi (projections of some mucous membranes, most specifically of the small intestine, which are tiny folds that project out like numerous finger). On each of … Read moreMicrovilli- Structure and Functions

Microtubules- Structure and Functions

Microtubules

Microtubules- Structure and Functions Microtubules are found in the cytoplasm of all types of eukaryotic cells with rare absence, such as in human erythrocytes. Microtubules are tiny, hollow, bead-like tubular structures that help cells maintain their shape. They are microscopic hollow tubes found inside cells that also provide motor functions for the cell. Structure of … Read moreMicrotubules- Structure and Functions

Cell Fusion- Types and Significance

Cell Fusion- Types and Significance

Cell Fusion- Types and Significance Until recently, cells were thought to be integral and discrete components of tissues, and their state was determined by cell differentiation. However, under some conditions, stem cells or their progeny can fuse with cells of other types, mixing cytoplasmic and even genetic material of different (heterotypic) origins. Cell fusion is an important cellular … Read moreCell Fusion- Types and Significance

Embryo Transfer

Embryo transfer

Embryo Transfer Embryo refers to the early developmental stage of an animal while it is in the egg or within the uterus of the mother. In humans the term is applied to the unborn child until the end of the seventh week following conception; from the eighth week, the unborn child is called a fetus. Embryo transfer refers to … Read moreEmbryo Transfer