Biology MCQs

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Cystic fibrosis is an example of nonsense mutation. While Sickle cell anemia is an example of missense mutation.

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A plasmid is an autonomously repeating circular extra-chromosomal DNA. They naturally exist in bacterial cells, and they also occur in some eukaryotes.

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Approximately 3 billion base pairs are there in the human genome. The complete set of nucleic acid sequences for humans encoded as DNA within 23 chromosome pairs in the cell nucleus and a small DNA molecule found within individual mitochondria is called the human genome.

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

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The average adult has a blood volume of roughly 4-5 to 5 litres, which is composed of plasma and several kinds of cells. By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cells about 0.7%.

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Animals, such as mammals and birds, that maintain a constant body temperature regardless of the temperature of the surroundings are called warm blooded. These include birds and mammals. Whales are aquatic mammals hence, being mammal, they are warm blooded. The have a thick layer of fats called blubber underneath their skin to maintain temperature even in cold water of oceans.

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Self-pollination can lead to inbreeding depression, or the reduced vitality in the species along with reduced chances of variation among members of species. This is why many flowers that could potentially self-pollinate have a built-in mechanism to avoid it.

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The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.

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Blood is a fluid connective tissue. It has two components: cells and fluid matrix in which it is embedded. The liquid matrix is known as the plasma, in which blood cells are present. Blood travels all around the body in specialized blood vessels.

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Silk worms are the larva of a moth (Bombyx mori) native to Asia that spins a cocoon of fine, strong, lustrous fiber that is the source of commercial silk. Silkworms feed on the leaves of the mulberries (genus- Morus) and sometimes on the Osage orange (Maclura pomifera).