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Prokaryotic cells are smaller and more simple than eukaryotic cells. They do not contain membrane bound organelles such as mitochondria, endoplasmic reticulum and golgi apparatus. They also do not have a ...

• when the water potential of the blood is too low (1) * This is detected by receptors in the hypothalamus (2)* the pituitary gland in the brain then secretes more ADH (3) * ADH increases the permeabi...

Phagocytosis is the non-specific engulfing and destroying of a pathogen by white blood cells known as phagocytes. On detecting foreign chemicals produced by a pathogen known as cytokines, the phagocyte wi...

ATP (standing for adenosine triphosphate) and a DNA nucleotide are both examples of nucleotides. Nucleotides are the building blocks for nucleic acids, such as DNA and RNA. DNA nucleotides make up DNA, as...

A variety of enzymes are involved in the process of DNA replication. For replication to occur each strand of DNA must be separated from the other, a result of its double helix structure and the hydrogen b...