Variable number of tandem repeats (VNTRs) in the DNA molecule are highly useful in
Answer: D
Variable number tandem repeats are the basis of DNA fingerprinting.
These short sequences are repeated a different number of times in each individual, so the pattern of fragment lengths is unique except in identical twins. Alec Jeffreys developed the technique in 1984.
Please log in or register to report this question.
In exo-biology we study about ________
Answer: D
Exobiology is the study of life beyond the earth - on other planets, satellites and in space generally.
It covers the search for life elsewhere, the conditions under which it could arise, and the survival of terrestrial organisms in space. It is also called astrobiology.
Please log in or register to report this question.
Most abundant tissues of our body are
Answer: A
Muscular tissue is the most abundant in the human body, making up about 40 per cent of body mass.
It comes in three kinds: skeletal muscle attached to bones and under voluntary control, smooth muscle in the walls of hollow organs, and cardiac muscle in the heart.
Please log in or register to report this question.
Which of the following is a physical basis of life ?
Answer: B
Protoplasm is called the physical basis of life - the living substance of the cell, comprising the cytoplasm and the nucleus together.
The term was coined by Purkinje in 1839 and given its famous description by Thomas Huxley. The mitochondrion, ribosome and nucleus are structures within it.
Please log in or register to report this question.
Spice saffron is obtained from which part of plant-
Answer: D
Saffron is obtained from the stigma of Crocus sativus.
Each flower yields three stigmas, picked by hand, so a kilogram takes about 150,000 flowers - which is why it is the most expensive spice in the world. In India it is grown in the Pampore area of Kashmir.
Please log in or register to report this question.
Ramapithecus and Cro-Magnon man are considered
Answer: A
Ramapithecus and Cro-Magnon man are regarded as ancestors of modern man.
Ramapithecus, found in the Siwaliks, lived about 12 million years ago; Cro-Magnon man, about 40,000 years ago in Europe, was anatomically modern and made the cave paintings of Lascaux.
Please log in or register to report this question.
Which of the following plays an important part in photosynthesis?
Answer: A
The chloroplast carries out photosynthesis.
Its thylakoid membranes hold the chlorophyll that captures light, and the surrounding stroma holds the enzymes that fix carbon dioxide into sugar. A leaf cell may contain fifty or more.
Please log in or register to report this question.
Which vitamin is required for the clotting of blood ?
Answer: D
Correct answer: Vitamin K
Vitamin K is needed to synthesise prothrombin and several other clotting factors in the liver. A deficiency prolongs bleeding, which is why newborn infants are routinely given a dose at birth.
Please log in or register to report this question.
Movement of cell against concentration gradient is called
Answer: B
Movement against a concentration gradient is active transport.
It moves a substance from low concentration to high, so it needs energy, supplied by ATP through carrier proteins. The sodium-potassium pump in every animal cell is the standard example. Osmosis and diffusion both run down the gradient and need no energy.
Please log in or register to report this question.
Biological control is to check growth of
Answer: D
Biological control means checking one pest by another organism.
A natural enemy - a predator, parasite or pathogen - is introduced against the pest. The ladybird beetle against aphids and Bacillus thuringiensis against caterpillars are examples; it avoids the residues and resistance that chemicals bring.
Please log in or register to report this question.
