Biology MCQs

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The eye has three main layers. These are Fibrous coat or Sclera, Vascular coat or Uveal tract, and Nervous coat or Retina.

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The retina is the innermost layer of the eyeball and the most delicate layer where photoreceptors are located. The retina senses light and creates electrical impulses.

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Myofibrils are bundles of protein filaments that contain the contractile elements of cardiomyocytes.

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Mucus helps to protect the stomach wall from its secretion of hydrochloric acid.

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The thymus gland secretes thymosin, which matures lymphocytes into T-lymphocytes which produces antibodies and thereby increases immunity.

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Listeriosis is a serious infection caused by Listeria monocytogenes. It is caused by eating food contaminated with the bacterium Listeria monocytogenes.

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Cooperation is a property that is not exhibited by pathogens. Whereas The invasion of a pathogen is the ability of a host to gain entry and multiply. A virus is the ability of a pathogen to cause disease. Toxicity is the power of a pathogen to form toxins capable of harming host cells.

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Some strains of Bacillus thuringiensis can kill certain insects such as Lepidoptera. They are an order of insects consisting of moths and butterflies.

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Insulin is central to regulating carbohydrate and fat metabolism in the body. It stops the use of fat as an energy source by inhibiting the release of glucagon. It removes excess glucose from the blood, which otherwise would be toxic. Insulin helps blood sugar enter the body’s cells so it can be used for energy. Insulin also signals the liver to store blood sugar for later use. Blood sugar enters cells, and levels in the bloodstream decrease, signaling insulin to decrease too.

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Panthera pardus is the scientific name of leopard, one of the five “big cats” in the genus Panthera. It is a member of the family Felidae with a wide range in sub-Saharan Africa and parts of Asia. It belongs to the Chordata phylum, Mammalia class and Carnivora order.