Biology Quiz 4

The colour of the eye depends upon the amount and quality of melanin present in the iris. A high concentration of melanin gives the iris a brown colour, a moderate concentration of melanin results in a greenish or hazel iris, and a low concentration of melanin results in a blue iris.

There are two types of vitamins: water-soluble and fat-soluble. Vitamin C and members of the vitamin B complex are water-soluble. Water-soluble vitamins are easily destroyed or washed out during food storage and preparation.

Sweat glands in mammals are primarily concerned with thermoregulation. Its main function is to control body temperature. As the water in the sweat evaporates, the surface of the skin cools.

The mineral constituent of chlorophyll is Magnesium (Mg). The chlorophyll molecule consists of a central magnesium atom surrounded by a nitrogen-containing structure called a porphyrin ring; attached to the ring is a long carbon-hydrogen side chain, known as a phytol chain. Other elements (not minerals) like carbon, nitrogen, oxygen and hydrogen are also present in chlorophyll.

Urease was the First Crystalline Enzyme and the Proof That Enzymes Are Proteins. The isolation and crystallization of urease by James Sumner, in 1926, provided a breakthrough in early enzyme studies.

Bullets contain lead, and once in the body, it can cause lead poisoning. Most pistol bullets are made of a lead-antimony alloy encased in a soft brass or copper-plated soft steel jacket. In rifle and machine-gun bullets, a soft core of lead is encased in a harder jacket of steel or cupronickel.

Protein is most important for the growth of children up to the age of 14 as during the teenage, children experience rapid changes in their physical development. Protein is a slow-digesting nutrient, which is needed for the repair and growth of muscles and tissues. It is also essential for the production of enzymes and hormones.

A diuretic, also called water pill, is a medicine which promotes the secretion of urine. It is a medication designed to increase the amount of water and salt expelled from the body as urine.

A glass snake (glass lizard) is a long, slender, legless lizard that superficially resembles a snake but is not a true snake. It has no legs but is not a snake, making it a unique and interesting member of the reptile kingdom.

There is no life on Moon because it has no water. Water is essential to life because all life forms are dependent on it. Life began in the presence of water. Almost all the reactions of a cell occur in the presence of water.