By: Erich Rosenberger M.D.
The human digestive system is an enormously complicated series of organs and tissues. The GI tract runs from your mouth, where food goes in, to your rectum, where the processed food comes out. Everything in between, including your esophagus, stomach, small intestine, and large intestine...
An overview of plant cell walls
By: Erich Rosenberger M.D.
It may seem somewhat obvious to say that plants and animals are different. Any six year old can tell the difference between a tree and a dog. But those differences are far deeper than just what the organisms look like. The very cells that plants...
Differences between mRNA and tRNA
Rna
By: Kevin Rainey
In essence both tRNA (transfer RiboNucleic Acid) and mRNA (messenger RiboNucleic Acid) are composed of the same elements. Both are single-stranded nucleotide chains. A nucleotide is a unit composed of a nitrogenous base, a ribose and a phosphate. The ribose and phosphate elements are common...
How do embryo cells differentiate and specialize to produce organs?
By: Mark Andrew Santiago
In vitro fertilization or commonly known as IVF which was introduced in the 70's gave rise to a lot of possibilities and controversies in the realm of science and morality. IVF allowed infertile couples a chance to have a child of their own because it...
By: Wendy R.
Protoplasm is the living material that is found in a cell. An older term for the living parts of a cell, protoplasm was first used in 1846 by Hugo von Mohl. Von Mohl used the term to describe what he called a slimy, grainy substance...
Electron transport chain of cellular respiration
By: Tami Port MS
All living things run on energy. If the organism is a plant or autotrophic microbe, the energy comes from sunlight. For all other forms of life, energy is extracted from nutrients through the reactions of metabolism-cellular respiration.* Cellular Respiration and the Electron Transport Chain...
By: Wendy R.
A cell is a basic structural and functional unit of all living things and is also considered a building block of life itself. Within the cell is found many complex structures known as organelles. These organelles range from simple (in Prokaryotes, such as bacteria) to...
The basics of the stages of mitosis
By: Rob Gray
Mitosis is the process by which a nucleate cell divides into two genetically identical daughter cells. These product cells are diploid cells, meaning they have the full 46 chromosomes. There is also no genetic difference at all between the daughter cells, unless there is some...
By: Tarek Musslimani
Muscle cells are polarizable like neurons. Namely they possess a membrane electric potential that can be depolarized and hyperpolarized. Muscle cells contain many nuclei inside their cytoplasm. However, muscle cells do not divide but can atrophy and hypertrophy. For the reason that muscle cells do...
By: Tarek Musslimani
Neurons are the functional cells of the nervous system. The nervous system contains in addition supporting cells that are called neuroglia. Neurons do not divide although they possess nuclei. On the other hand, neuroglia do divide. Because neurons do not divide they are not suceptible...

 

1 19 20 21 22 23 33