Biology MCQs

Notes:
Rhinovirus is also known as the common cold. This is also called RNA Virus.

Notes:
A method for the delivery of nucleic acids to cells by high-speed particle bombardment is called Biolistics.

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Acidity and alkalinity are expressed on the pH scale, which ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline). A pH of 7.0, in the middle of this scale, is neutral. Blood is normally slightly basic, with a normal pH range of 7.35 to 7.45.

Notes:
Herbivorous animals have longer intestines than that of carnivorous animals. This is because their diet is grass and plants, made up of fibre and cellulose which are hard to digest. As a result, the herbivorous animals need a longer digestive track to digest their foods completely.

Notes:
Muscle fatigue refers to the decline in muscle force generated over time. Several factors contribute to muscle fatigue, the most important being lactic acid accumulation. Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement and insufficient supply of O2.

Notes:
The stethoscope is an acoustic medical device listening to the internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the chest, and two tubes connected to earpieces. Working of a stethoscope is based on reflection of sound. In a stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ear by multiple reflections of sound.

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Pituitary gland only acts pure endocrine gland secreting only hormones. The three others i.e. pancreas and gonads secrete extra cellular enzymes and factors too like gametes by gonads.

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The sugar present in DNA is 2-deoxyribose, which is a pentose sugar. Deoxyribose is one of the three components of nucleotides, the building blocks of DNA. Each nucleotide consists of a phosphate group, a nitrogenous base—adenine (A), thymine (T), cytosine (C), or guanine (G)—and deoxyribose.

Notes:
100g of peanut oil (groundnut oil) contains 17.7g of saturated fat, 48.3g of monounsaturated fat, 33.4g of polyunsaturated fat, and 0mg of cholesterol. It is fast replacing dairy products due to the absence of cholesterol.

Notes:
Bacteria are prokaryotes, which, by definition, are cells that don’t possess membrane-bound organelles. Mitochondria are membrane-bound organelles. Cellular respiration, in prokaryotes, occurs within the cytoplasm or inner surfaces of the cell.