Biology MCQs

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Somatostatin works against Growth Hormone (GHRH), hence it is known as Growth Inhibiting Hormone. It consists of two peptides of 14 and 28 amino acids and is released from neurosecretory nerves.

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A connective tissue cord extending between the testis and the abdominal wall is known as the spermatic cord.

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Ovaries are the female reproductive organs that are responsible for producing various hormones and produce female gametes.

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Clostridium hemolytic are the causes of red water disease. Redwater disease in cattle is caused by a protozoan blood parasite in the erythrocytes.

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Klenow fragment is derived from DNA Pol-I. A Klenow fragment is a large protein fragment. It is enzymatically cleaved by the protease subtilisin to DNA polymerase from E. coli.

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The lungs are the primary organs of respiration in humans and many other animals including a few fish and some snails. Their function in the respiratory system is to extract oxygen from the atmosphere and transfer it into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere, in a process of gas exchange.

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The human heart has four chambers, two superior atria and two inferior ventricles. The atria are the receiving chambers and the ventricles are the discharging chambers. The pathway of blood through the human heart consists of a pulmonary circuit and a systemic circuit.

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Skeletal muscle is a form of striated muscle which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibres known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.

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In the blood the key minerals are iron, copper, zinc, sodium, potassium, calcium and magnesium. Minerals constitute important part of blood plasma that constitutes almost 55% of blood. In the blood, iron is found in larger amounts than any other mineral.

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Insects and birds have the simplest surface waxes that serve to water proof feathers. The interlocking feather barbs and a special waxy coating create a shield that water runs off of. Besides, while a few components present in surface lipids can prevent growth of pathogens, the total surface with waxed layer certainly functions to prevent microbial entry into the organism.