27. Each species has characteristic chromosome number and most of their cells ha

Question

27. Each species has characteristic chromosome number and most of their cells have complete set of these chromosomes. However in the life cycle of humans only sperm and eggs have the ___________ number of chromosomes. a. Diploid b. Polyploid c. Haploid d. Monoploid 28.How does the structure of DNA relate to the coding of hereditary information? a DNA codes hereditary information on both strands if they have parallel polarity. b The amount of proteins the DNA codes depends on the number of times the double helix spirals c The sequence of nucleotides on the strands of DNA enables genetic information to be coded. d DNA codes genetic information only when the two strands of the double helix unwind and straighten out. 23. What type of cell are bacteria? a Complex b Prokaryotic c Eukaryotic d Simple

Explanation / Answer

27) Human spermand egg undergo fusion to form a zygote . This zygote at the end undergo certain developmental stages and growth to form the individuals. Number of species must be constant in all species and therefore sperm and egg undergo meiosis. Hence it reduces diploid cells to haploid cells. Hence in human sperm and eggs are haploid.

Hence option (c) is correct.

28). The most important feature of the DNA strand is that it forms the anti-parrallel structure. So due to the formation of double helix it allows to cell to make new copies which are in identical by reading and coping the stands seperately. So DNA codes genetic information only when the two strands of double helix unwind and straighten out.

Hence option (d) is correct.

23) Bacteria are the prokaryotic type cells because they don't have nucleus and membrane bound cell organelles. Nuclear material is also in single form of chromosomes.

Therefore option (b) is correct.

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