Cell growth and division
By: Louis Rosenfeld
All living organisms are made from cells, the basic unit of biology. Cells are separated from their outside environment by a lipid and protein-containing membrane. The membrane acts to exchange nutrients from the outside and waste products from the inside of the cell. As the...
By: Erich Rosenberger M.D.
Embryogenesis is the process by which an embryo forms and grows in the uterus of a pregnant woman. The process of embryogenesis begins when an egg is fertilized by a sperm. After that, a massively complex sequence of events goes in motion. This process ultimately...
Stem cells explained
By: Jon Clark
Stem cells - they are in the news and have been for a few years now - this shouldn't be a surprise because they offer the hope of a cure to currently incurable medical conditions such as Parkinson's disease and spinal injuries. Also sufferers of...
By: Janet Grischy
A neuron is a nerve cell, a specialized cell that conducts nerve impulses. Its function is to transmit information throughout the body and brain. Sensory neurons transmit information from the senses to the spinal cord and brain. Motor neurons send information in the other direction...
Comparison of sexual and asexual reproduction
By: Jon Clark
The comparison between sexual and asexual reproduction is actually quite a simple one in terms of their functions. Sexual reproduction happens in order to mix up the genes as much as possible and create variation in the offspring - all of which are unique genetically...
By: Louis Rosenfeld
The cell membrane separates a cell from its watery environment. It does so because it is composed of water-insoluble phospholipids and proteins. The phospholipids form a bilayer sheet surrounding the cellular contents; much like a bubble surrounds air. Proteins are embedded in the phospholipid bilayer...
By: Erich Rosenberger M.D.
The liver is the largest gland in the body. It's a huge organ that sits roughly in the middle of your abdomen. It is a hugely important gland that is responsible for a wide range of metabolic and chemical reactions that are vital to living...
Overview of cell biology
By: Jon Clark
All living things are made up of cells. So understanding what a cell is and what it is made up of is very important in Biology. Cells are rather tiny - you could fit about 100 on a pin head. They contain even tinier little...
By: Janet Grischy
Sexual reproduction combines the genes of two parents to produce an offspring. Asexual reproduction takes many forms, but in general, the genetic material of only one parent is included in the next generation. Each form of reproduction has strengths and weaknesses, and is suited to...
Differences between mRNA and tRNA
By: Valerie Mondesir
RNA (ribonucleic acid) molecules are an important part of cellular function. There are several kinds of RNA and they are all involved in translating DNA gene codes into protein. Proteins play many vital functions within a cell, such as transportation, structure, and catalysis. Without...

 

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