PROKARYOTES
PROKARYOTES Prokaryotes include cells of two domains, the Archaea and the Bacteria , which diverged early in evolution. The Archaea includ...Read More
Showing posts with label Cell. Show all posts
Showing posts with label Cell. Show all posts
THE EVOLUTION OF METABOLISM
THE EVOLUTION OF METABOLISM Because cells originated in a sea of organic molecules, they were able to obtain food and energy directly from...Read More
HOW DID THE FIRST CELL ARISE?
HOW DID THE FIRST CELL ARISE? It appears that life first emerged at least 3.8 billion years ago, approximately 750 million years after Ear...Read More
What Are Stem Cells?
What Are Stem Cells? S tem cells are incredibly special because they have the potential to become any kind of cell in the body, from ...Read More
Inside a Nucleus
Inside a N ucleus S urrounded by cytoplasm, the nucleus contains a cell’s DNA and controls all of its functions and processes such as ...Read More
TYPES OF HUMAN CELL
TYPES OF HUMAN CELL NERVE CELLS The cells that make up the nervous system and the brain are nerve cells or neurons. Electrical messag...Read More
CELL STRUCTURE EXPLAINED
CELL STRUCTURE EXPLAINED There are around 75 trillion cells in the human body, but what are they and how do they work? C ells are ...Read More
Membrane Transport Proteins And Ion Channels
Membrane Transport Proteins And Ion Channels Proteins provide several routes for the movement of materials across membranes: (i) large...Read More
Body water compartments and physiological fluids
Body water compartments and physiological fluids Osmosis Osmosis is the passive movement of water across a semi-permeable membrane f...Read More
Homeostasis And The Physiology Of Proteins
Homeostasis And The Physiology Of Proteins Claude Bernard (1813–1878) first described ‘le mileau intérieur’ and observed that the inte...Read More
Cells, Membranes And Organelles
Cells, Membranes And Organelles The aqueous internal environment of the cell is separated from the aqueous external medium by an envelo...Read More
Biological Electricity
Biological Electricity Electrical events in biological tissues are caused by the movement of ions across the membrane. A potential dif...Read More
The Cell Cycle
The Cell Cycle I s an orderly sequence of events that occur as a cell duplicates its contents and divides (Fig. 8.1). During the cell ...Read More
Mitochondrial Gene Disorders
Mitochondrial Gene Disorders The mitochondria contain their own DNA, which is distinct from the DNA contained in the cell nucleus. Ther...Read More
Chromosomal Disorders
Chromosomal Disorders Chromosomal disorders form a major category of genetic dis- ease, accounting for a large proportion of reproductiv...Read More
Single Gene Disorders
Single-Gene Disorders Single-gene disorders are caused by a defective or mutant allele at a single gene locus and follow mendelian patt...Read More
Recombinant DnA technology
Recombinant DnA technology The term recombinant DNA refers to a combination of DNA molecules that are not found together in nature. Rec...Read More
Genetic Imprinting
Genetic Imprinting Besides autosomal and sex-linked genes and mitochondrial inheritance, it was found that certain genes exhibit a “par...Read More
Chromosome structure
Chromosome structure Cytogenetics is the study of the structure and numeric characteristics of the cell’s chromosomes. Chromosome studi...Read More
Cell Division
Cell Division Two types of cell division occur in humans and many other animals: mitosis and meiosis. Mitosis involves duplication of s...Read More
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