Biology Quiz 4

There is no life on Moon because it has no water. Water is essential to life because all life forms are dependent on it. Life began in the presence of water. Almost all the reactions of a cell occur in the presence of water.

Keratin is a type of structural protein which makes the skin layer impervious to water. It is found on epithelial cells, which line the inside and outside surfaces of the body. Keratins help form the tissues of the hair, nails, and the outer layer of the skin.

Sunlight is not required for seed germination. Light isn't strictly necessary for germination in most plant species. All seeds need water, oxygen and suitable temperature to germinate.

Endoscopy is an optical instrument used to see inside the alimentary canal. It is a nonsurgical procedure used to examine a person's digestive tract. Using an endoscope, a flexible tube with a light and camera attached to it, the doctor can view pictures of the digestive tract on a monitor.

The universal recipient belongs to the AB group of blood. “O blood group” does not have any antigens. It is called the “universal donor” type because it is compatible with any blood type. “AB blood group” is called the “universal recipient” type because a person who has it can receive blood of any type.

Vitamin B₁₂, cobalamin, is a cobalt-containing ring-contracted modified tetrapyrrole that represents one of the most complex small molecules made by nature. The core component of cobalamin is the corrin macrocycle that acts as the main ligand for the cobalt.

Sweat glands in mammals are primarily concerned with thermoregulation. Its main function is to control body temperature. As the water in the sweat evaporates, the surface of the skin cools.

DPT is a combination vaccine to protect against Diphtheria, Tetanus and Pertussis (whooping cough).

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.

Adrenaline is a neurotransmitter in the sense that, within the brain, it helps neurons to communicate with one another.