Biology Quiz 2

A polymer is a substance or material consisting of very large molecules, or macromolecules, composed of many repeating subunits. polyethylene (alse known as Polythene) is a light, versatile synthetic resin made from the polymerization of ethylene.

A lymphocyte is a type of white blood cell that is part of the immune system. Lymphocytes include natural killer cells, T cells, and B cells. The job of B cells is to make antibodies, which are proteins produced by the immune system to fight foreign substances known as antigens.

The heart is the only organ in the body that never rests throughout the entire life.

An ecosystem consists of a community of organisms together with their physical environment. Ecosystems can be of different sizes and can be marine, aquatic, or terrestrial.

In MRI (Magnetic resonance imaging) machine, a magnetic wave is used. MRI is a method of using a strong magnetic field to produce an image of the inside of a person's body. Unlike X-ray, CT, and PET scans; MRIs do not use radiation and are considered a non-invasive procedure.

Smallpox is an acute contagious disease caused by the variola virus, a member of the orthopoxvirus family. In 1980, the World Health Organization declared that smallpox had been eradicated.

The fluid part of blood without corpuscles is called Plasma. Blood plasma is fluid part of blood in which corpuscles (blood cells) are absent, but contains proteins and other constituents of whole blood in suspension. Plasma is the largest part (about 55%) of blood.

Hepatitis is a viral disease caused by hepatitis viruses A, B, C, D, and E. It infects liver cells and causes inflammation.

Drying oils contain a fairly large proportion of unsaturated fatty acids. They are liquid oils (triglycerides) that cross-link and solidify by reaction with atmospheric oxygen. In order for this to happen, the fatty acid part of the triglyceride must contain at least two centers of unsaturation (double bonds) on one molecular chain.

Amebiasis is an intestinal (bowel) illness caused by a microscopic (tiny) parasite called Entamoeba histolytica, which is spread through human feces (poop).