Biology MCQs

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Active immunity conveys the longest-lasting immunity to an infectious agent. Active immunity results when exposure to a disease organism activates the immune system to produce antibodies against that disease.

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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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The parathyroid glands secrete parathyroid hormone or parathormone. The parathyroid glands are two pairs of small, oval-shaped glands.

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The ovarian cortex consists of a white body or corpus Albicans. It represents the degenerative corpus luteum. The corpus luteum secretes hormones. Progesterone during pregnancy, and at the end of pregnancy, the hormone relaxes.

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Plague disease is caused by Yersinia pestis bacterium which is spread mostly by fleas on rodents and other animals.

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Skin infections and sometimes pneumonia, endocarditis, and osteomyelitis diseases are caused by Staphylococcus aureus. It is a type of Gram-positive round-shaped bacteria.

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The law of dominance is also called Mendel’s first law of inheritance. According to this, the hybrid offspring will only inherit the dominant trait in the phenotype.

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The genetic heritage passed down by our biological parents is known as Heredity.

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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.