Biology MCQs

Notes:
A protein that provides structural support to a chromosome is called histone.

Notes:
Chickenpox, also known as varicella, is a highly contagious infection caused by the varicella zoster virus. The disease results in a characteristic skin rash that forms small, itchy blisters, which eventually scab over. It is an airborne disease which spreads easily through the coughs and sneezes of an infected person.

Notes:
In the frog, Mesonephros is the functional kidney in embryonic as well as adult stage and mesonephric duct functions as both urinary and genital duct. Tubules of the anterior region of kidney get connected to testis to collect spermatozoa, while the posterior region remains as functional kidney and transports urinary wastes to the exterior.

Notes:
Somatosensory Receptor refers to a cell or group of cells specialized to detect changes in the environment and trigger impulses in the sensory nervous system. They are specialized to respond to a particular physical property, such as “touch,” “light,” or “temperature.” The somatosensory system is a part of the sensory nervous system.

Notes:
The inner layer of the stomach is full of wrinkles known as rugae (or gastric folds). Rugae both allow the stomach to stretch in order to accommodate large meals and help to grip and move food during digestion.

Notes:
Among the many things parents hand down to their children are 23 pairs of chromosomes-those thread-like structures in the nucleus of every cell containing the genetic instructions for every person. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair. Females always pass an X chromosome onto their offspring. If the father passes on an X chromosome, the baby will be genetically female, and if the father passes on a Y chromosome, the baby will be genetically male.

Notes:
The skin is the soft outer covering of vertebrates that guards the underlying muscles, bones, ligaments, and internal organs. The cutaneous membrane is the technical term for our skin. The skin’s primary role is to help protect the rest of the body’s tissues and organs from physical damage such as abrasions, chemical damage such as detergents, and biological damage from micro organisms. Our skin is made of three general layers. In order from most superficial to deepest they are the epidermis, dermis, and subcutaneous tissue.

Notes:
A tendon is a fibrous connective tissue which attaches muscle to bone. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.

Notes:
Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides. Infection occurs by eating food or drink contaminated with Ascaris eggs from feces. Ascariasis is most common in places without modern sanitation.

Notes:
Sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The cells are rigid and non-stretchable and are usually found in non-growing regions of plant bodies, such as the bark or mature stems. Sclerenchyma is one of the three types of fundamental, tissue in plants; the other two types being Parenchyma and Collenchyma.