Biology MCQs

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As we all know, chlorophyll is one of the main pigments present in autotrophs. It contains carbon, nitogen, oxygen, hydrogen and lastly magnesium.

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Haemoglobin is found dissolved in the plasma of earthworm because they don’t have proper respiratory system and the hemoglobin is dissolved in plasma for the diffusion of gases and other materials.

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Adipose tissue that’s fat cells which are under the skin act as barrier to loss of the heat from the body and it protects the skin from entering of highly reactive UV rays of the sun. Fat present below the skin surface in our body, act as an insulator against loss of heat from the body. The deposited fat works as barrier, which prevents loss of heat.

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• Apoptosis is the process of programmed cell death in multicellular organisms. Apoptosis occurs during normal cell turnover, development and in immune system.
• Ageing is the accumulation of changes.
• Degeneration is the deterioration of a tissue or an organ in which its function is diminished or its structure impaired.
• Necrosis is the disorganized break down of flesh in some part of the body of multicellular organism.

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Complementary base pairing in the DNA double helix (with its complementary DNA strands) describes the manner in which deoxyribose- nucleotides bind to each other. Essentially it means that the bases are arranged along the molecule such that the chains fit together snugly so as to be lightly secured by hydrogen bonds.

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Louis Pasteur was a French biologist, microbiologist, and chemist renowned for his discoveries of the principles of vaccination, microbial fermentation and pasteurization. He is remembered for his remarkable breakthroughs in the causes and prevention of diseases, and his discoveries have saved many lives ever since. He reduced mortality from puerperal fever and created the first vaccines for rabies and anthrax. His medical discoveries provided direct support for the germ theory of disease and its application in clinical medicine. He is best known to the general public for his invention of the technique of treating milk and wine to stop bacterial contamination, a process now called pasteurization. He is regarded as one of the three main founders of bacteriology, together with Ferdinand Cohn and Robert Koch, and is popularly known as the “father of microbiology”.

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Watson and Crick realized that DNA was made up of two chains of nucleotide pairs that encode the genetic information for all living things.

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Euglena is an example of the Protista kingdom and has both plant and animal characteristics.

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Mycoplasma is an anaerobic organism that requires oxygen to survive.

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The minerals associated with cytochromes are Fe and Cu.