Biology Quiz 8

There are two main types of cholesterol: low-density lipoprotein (LDL), or “bad” cholesterol, and high-density lipoprotein (HDL), or “good” cholesterol. HDL cholesterol is considered to be the best cholesterol because it helps remove other forms of cholesterol from the bloodstream.

Testosterone is the primary sex hormone in males. It plays a key role in the development of male reproductive tissues such as testes and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

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

Tetanus is an infection caused by bacteria called Clostridium tetani. Spores of tetanus bacteria are everywhere in the environment, including soil, dust, and manure. The spores develop into bacteria when they enter the body.

The typical composition of exhaled air is about 18 percent O₂, 78 percent N₂, and 4 percent CO₂.

Vitamin B₁₂, also known as cobalamin, is an essential vitamin necessary for healthy nerve tissue, brain function, and red blood cell production. Rich sources of vitamin B₁₂ are meat, fish, milk, cheese, eggs, etc.

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.

The study of extinct animals is called Paleontology. Paleontology is the study of the history of life on Earth as based on fossils. Fossils are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock.

To measure blood pressure, doctor uses an instrument called a sphygmomanometer, which is more often referred to as a blood pressure cuff.

The nitrogen present in the atmosphere is utilised through microorganisms. Plants get the nitrogen from the soil, where it has already been fixed by microorganisms (bacteria and archaea). Bacteria and archaea in the soil and in the roots of some plants have the ability to convert nitrogen from the air (N₂) to ammonia (NH₃), thereby breaking the tough triple bond of molecular nitrogen.