Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Important site for formation of glycoproteins and glycolipids is
(a) The Golgi apparatus principally performs the function of packaging materials. Golgi apparatus is the main site of formation of glycoproteins and glycolipids.
Which is not true for prokaryotic cells ?
(d) A prokaryotic cell (G.k pro-before, karyon-nucleus) is the one in which the genetic material is not organised into nucleus and all membrane bound organelle are absent. DNA is naked and lies variously coiled in the cytoplasm and is called genophore or nuclear body or nucleoid. Cytoskeletal structure are extremely minute, fibrous and tubular structure which form the structural framework inside the cell. They are of three type - microfilaments, intermediate filament and microtubules. Microtubules function as cytoskeleton and provide rigidity and shape to certain cell parts like pseudopodia of some protistans and elongated axons of nerve cells.
If there were present no subcellular organelles in a eukaroytic cell, the rate of metabolism will
(b) If there were present no subcellular organelles in an eukaryotic cell, the rate of metabolism will decrease.
Some Gram -ve bacteria have peptidoglycan and an extra layer of
(a) Cell wall is two layered and wavy in Gram (-) bacteria. The wall contains peptidoglycan in the inner layer. The outer layer has lipopolysaccharides, proteins and phospholipids.
A chromosome carrying the centromere at one of the ends is called
(c) If centromere is truly terminal, i.e. situated at the tip of chromosome, the chromosome is said to be telocentric. Telocentric chromosomes are very rare.
In which one of the following would you expect to find glyoxysomes?
(b) Glyoxysomes are enzymes which play a critical role in lipid metabolism in seedlings. Hence they are supposed to be present in endosperm of castor as endosperm of wheat will posses starch.
Genes present in the cytoplasm of eukaryotic cells are found in
(a) Genes present in the cytoplasm of eukaryotic cells are found in the mitochondria and inherited via egg cytoplasm. Maternal inheritances are the genetic effects that are transmitted via the maternal line. There are many such effects some resulting from the purely maternal origin of mitochondria or chloroplasts, others from effects on the phenotype of the embryo by easily development within the female, such as maternal influence on coiling of snails.
What are Singer and Nicolson known for?
(c) The most recent model of plasma membrane is fluid-mosaic model which was proposed by Singer and Nicolson in 1972. According to this model, the membrane does not have a uniform disposition of lipids and proteins but is instead a mosaic of the two. Further, the membrane is not solid but is quasifluid.
What is a plasmid ?
(c) Plasmid is a structure (loop) in bacterial cells consisting of DNA that can exist and replicate independently of the chromosome. These are extra chromosomal circular double stranded DNA
(dsDNA) which provide genetic instructions for certain cell activities (e.g. resistance to antibiotic
drugs). They can be transferred from cell to cell in a bacterial colony. Plasmids are widely used
as vectors to produce recombinant DNA for gene cloning.
Cell theory was proposed by
(c) Cell theory was proposed by a German botanist M.J. Schleiden and another German, a zoologist T.S. Schwann in 1839.
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