Biology MCQs

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Vagina > Cervix > Uterus > Oviduct is the correct order of travel of sperm through the female reproductive tract before it reaches the egg.

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Ringworm or round red or silver type superficial fungal infections of the skin are caused by species of Trichophyton, Microsporum, and Epidermatophyton. There are dry scaly lesions on the skin, nails, and scalp that cause intense itching.

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Sesbania rostrata legumes have a symbiotic relationship with two nitrogen-fixing bacteria.

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Azolla pinnata is the best fertilizer for paddy. Azolla pinata is a species of fern that is known by several common names, including mosquito fern, winged mosquito fern, and water velvet.

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Bacteria protect themselves from viruses by fragmenting viral DNA with Exonuclease. Enzymes that work by cleaving one nucleotide at a time from the end (Exo) of the polynucleotide chain are called exonucleases.

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Restriction enzymes, also known as restriction endonucleases, are proteins that act like molecular scissors, capable of cutting DNA molecules at specific locations. They are used for generating fragmentation patterns of DNA and creating recombinant DNA. However, the actual synthesis of new DNA strands is not a function of restriction enzymes, but is performed by enzymes called polymerases.

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Ethanol is used to obtain a precipitate of pure DNA. Renewable fuel made from corn and other plant materials is called ethanol.

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Sphygmomanometer an instrument for measuring blood pressure. It typically consists of an inflatable rubber cuff which is applied to the arm and connected to a column of mercury next to a graduated scale, enabling the determination of systolic and diastolic blood pressure by increasing and gradually releasing the pressure in the cuff. The sphygmomanometer was invented by Samuel Siegfried Karl Ritter von Basch in 1881.

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Vitamin D is essential in helping the body absorb and use calcium; in fact, the body cannot absorb calcium at all without some vitamin D. Vitamin D helps our intestines absorb calcium from the food we eat and helps build stronger bones.

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Cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver, dairy products, vegetable and fruits yellow in colour. Nyctalopia also called “Night Blindness” is a condition making it difficult or impossible to see in relatively dim light. To over come deficiency of vitamin-A, one needs to feed of food products rich in carotene which is used in synthesis of vitamin-A is liver.