Biology Quiz 4

The giraffe is a quiet animal that seems to have very little to say. Therefore, many assume that the giraffe is dumb.

Outside the nucleus, DNA is found in Mitochondria. Most DNA is located in the cell nucleus (where it is called nucleus DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA).

The main function of white blood cells (WBCs) in the body is to protect the body against disease. WBCs protect the body against infection. As WBCs travel through the bloodstream and tissues, they locate the site of an infection and act as an army general to notify other WBCs of their location to help defend the body from an attack of an unknown organism.

Cytology is the study of cells as fundamental units of living things. A cytology test is used to look closely at cells and body fluids.

Urea and uric acid are the two nitrogenous wastes that are secreted in urine. Urea is the main nitrogenous waste in humans. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals. It is the main nitrogen-containing substance in the urine of mammals. A normal urea level in the urine is 12 to 20 grams over 24 hours.

BCG (Bacille Calmette-Guerin) vaccination is to be given to a newborn child within six months. This vaccination provides consistent protection against tuberculosis (TB) disease. It is recommended for all babies soon after birth up to 1 year old (for some specific areas).

Enzymes play a key role in process of digestion. The human body makes enzymes in the digestive system, including the mouth, stomach, and small intestine. Digestive enzymes help the body break down carbohydrates, fats, and proteins from food. This is necessary to allow for the absorption of nutrients and to maintain optimal health.

Genetically modified (GM) foods are foods derived from organisms whose genetic material (DNA) has been modified in a way that does not occur naturally. GM is a technology that involves inserting DNA into the genome of an organism. To produce a GM plant, new DNA is transferred into plant cells.

The immunity caused by the B-lymphocytes is called Humoral Immunity. Humoral immunity is the process of adaptive immunity manifested by the production of antibodies by B-lymphocytes. It develops in bone marrow.

Shark and Ray belong to cartilaginous fish. Cartilaginous fish (Chondrichthyes) is a fish of a class distinguished by having a skeleton of cartilage rather than bone, including the sharks, rays, and chimeras.