Biology MCQs

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Meningitis is a disease which is characterized by inflammation of meninges, the covering that lie over the brain and spinal chord is caused by bacteria. The meninges are the three membranes that cover the brain and spinal cord.

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Yeast plays a role in production of alcohol in beer. Yeast is a little, single-cell organism and is one of the simplest forms of plant life. It is responsible for the fermentation process in beer.

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Cuttle fish or cuttles are marine molluscs of the order Sepiida. Molluscs are an important phylum of invertebrate animals. It is the second-largest phylum of invertebrate animals after the Arthropoda.

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Butter is a type of dairy product that is made by churning cream or milk until the fat particles in the milk coalesce to form a solid mass. The resulting solid mass is known as butter and it is composed mostly of butterfat, which is a type of fat that is found in milk. To be more specific, butter is a fat that is dispersed in milk. This means that the butterfat is evenly distributed throughout the milk, giving it a smooth and creamy texture. While butter is most commonly made from cow’s milk, it can also be produced from the milk of other mammals, such as sheep, goats, buffalo, and yaks.

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The term Elasmobranches is a collective name for the sharks, skates and rays. Elasmobranches have a skeleton made of cartilage, no swim bladders and rough skin made up of small dermal dentils. Elasmobranches are renowned for their highly tuned senses.

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Thymine is the nitrogenous base that is present in DNA but not in RNA. Thymine is a pyrimidine base that pairs with adenine through hydrogen bonding in DNA. In RNA, thymine is replaced with uracil, which pairs with adenine.
The four nitrogenous bases in DNA are adenine, guanine, cytosine, and thymine. The four nitrogenous bases in RNA are adenine, cytosine, guanine, and uracil.

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The regulation of RBC production is accomplished by the Erythropoietin hormone secreted by the kidneys.

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Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore.

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Protein-coding genes influence cell activities through the production of proteins, including enzymes and structural proteins. Messenger RNA carries the coding information to ribosomes. Some genes produce functional RNA rather than proteins, so protein synthesis is not the sole function of every gene.

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Biofertilizers are substances that contain microorganisms, which when added to the soil increase its fertility and promote plant growth. Urea is not a biofertilizer.