Biology MCQs

Notes:
The thymus gland produces the hormone thymosin. Thymosin stimulates the development of T cells, which fight disease. The thymus gland is located in the chest, between the lungs and behind the breastbone. It is active until puberty, after which it shrinks and is replaced by fat.
The thymus gland also produces thymopoietin and thymulin. Thymopoietin is a polypeptide hormone made up of 49 amino acids.

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Algae is an informal term for a large, diverse group of photosynthetic eukaryotic organisms that are not necessarily closely related, and is thus polyphyletic.

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Vitamin E is known as anti-sterility vitamin or fertility vitamin. It is chemically called as tocopherol. Vitamin E deficiency occurs rarely in adults. Much like vitamin C, vitamin E is another powerful anti-oxidant. Vitamin E is used during testosterone synthesis. Sperm production or spermatogenesis requires vitamin E as well as zinc. Following symptoms have been associated with vitamin E deficiency in humans:

• Muscular weakness & dystrophy, nocturnal muscle cramps
• Neurological disorders
• Degeneration of liver (hepatic necrosis)
• Shortened life-span of RBCs

Notes:
Plants absorb ammonium and nitrate during the nitrogen assimilation process, after which they are converted into nitrogen-containing organic molecules, such as amino acids and DNA. Animals cannot absorb nitrates directly. They receive their nutrient supplies by consuming plants or plant-consuming animals.

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Malaria is a life-threatening disease. It’s typically transmitted through the bite of an infected Anopheles mosquito. Infected mosquitoes carry the Plasmodium parasite. When this mosquito bites you, the parasite is released into your bloodstream.

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If he inherits his mother’s other X chromosome, he will have normal blood clotting. So a carrier’s son has a 50% chance of having hemophilia. A baby girl will inherit an X chromosome with a dominant gene for normal blood clotting from her father. So the daughter will not have hemophilia.

Notes:
The aorta (the main blood supplier to the body) branches off into two main coronary blood vessels (also called arteries). These coronary arteries branch off into smaller arteries, which supply oxygen-rich blood to the entire heart muscle. The right coronary artery supplies blood to the right side of the heart.

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Anatomy is the branch of biology that studies the structure and parts of organisms. Anatomy is a branch of natural science that deals with the structural organization of living things.

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Cell differentiation is the process by which dividing cells change their functional or phenotypic type. All cells probably derive from stem cells and acquire their functions when they mature. Walther Flemming discovered cell differentiation.

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Smuts, rusts, and molds groups is used to represent disease-related fungi.