Biology Quiz 3

Saccharin is not a plant product. It is a non-nutritive or artificial sweetener. It's made in a labouratory by oxidizing the chemicals o-toluene sulfonamide or phthalic anhydride. It looks like white, crystalline powder.

EEG (electroencephalogram) is used to detect the functioning of the Brain. It is a test that detects electrical activity in the brain using small, metal discs (electrodes) attached to the scalp.

Dinosaurs were reptiles that became extinct. They are archosaurs, a larger group of reptiles that first appeared about 251 million years ago, near the start of the Triassic Period.

Pneumatic bones are hollow and found in birds. Due to pneumatic bones, birds can fly in the air.

Corpus luteum (CL) is a yellow hormone-secreting body in the female reproductive system which secretes progesterone. It is a completely normal cyst that forms on the ovary every single month in women of childbearing age. This cyst is actually a group of cells inside ovaries that forms during each menstrual cycle. It appears right after an egg leaves the ovary (ovulation).

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.

Competition for food, light and space is most severe in closely related species growing in the same area or niche. It is most severe in closely related species growing in the same habitat as these species will have the same niche, type of food they eat and same characteristics, etc.

Aflatoxins are produced by fungi. They are a family of toxins produced by certain fungi that are found on agricultural crops such as maize (corn), peanuts, cottonseed, and tree nuts.

Blood types are determined by the presence or absence of certain antigens. There are 4 main blood groups – A, B, AB and O. Blood group is determined by the genes inherited from the parents. AB-positive blood type is known as the “universal recipient” because AB-positive patients can receive red blood cells from all blood types.

Oral contraceptives (birth control pills) are used to prevent pregnancy. Estrogen and progesterone are two female sex hormones. Combinations of estrogen and progesterone work by preventing ovulation (the release of eggs from the ovaries).