Biology Online Quiz

The reaction of a person to a bee sting may vary according to the bee species. While bee stinger venom is slightly acidic.

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.

Pasteurization of milk requires temperatures of about 63°C (145°F) maintained for 30 minutes or, alternatively, heating to a higher temperature, 72°C (162 °F), and holding for 15 seconds (and yet higher temperatures for shorter periods of time). The times and temperatures are determined to be necessary to destroy disease-causing microorganisms found in milk.

Goats tend to be less susceptible to heat stress than animals like cows, donkeys, and buffalos. They can tolerate more summer heat. A healthy adult goat can survive in temperatures ranging from below -18°Celcius and above 38°Celcius.

Vitamin B₆ is one of the B vitamins. Deficiency of Vitamin B₆ in men causes anemia because it is needed to form red blood cells.

Vitamin C helps to prevent (viral and bacterial) infections in the human body. It contributes to collagen production, wound healing, and bone formation. It also strengthens blood vessels and supports the immune system.

Antigen stimulates the production of antibodies when introduced into a living organism. It is a substance that enters the body and starts a process that can cause disease. The body then usually produces substances (antibodies) to fight the antigens.

In Bacteria generally hormone is not found but it can produce hormones that can affect host metabolism, immunity and behavior.

Leukaemia is a cancer of the blood or bone marrow and is characterized by an abnormal proliferation of blood cells, usually white blood cells (leukocytes).

Estrogen is a female hormone that plays various roles. It helps develop and maintain both the reproductive system and female characteristics, such as breasts and pubic hair.