25. During microscopic examination of potential cancer cells, some of the cells

Question

25. During microscopic examination of potential cancer cells, some of the cells are graded as anaplastic. This means they A) divide slowly B) are easily identified to tissue of origin C) are poorly differentiated. D) respond well to chemotherapy E) are not aggressive 26. Changes in an organism that are the result of changes in gene action(s) are known as A) diseases. B) epigenetic C) silencing D) micro-RNA mediated. E) all of the above 27. The specific field of study that examines the gene products ofa genome is known as A) genomics. B) bioinformatics. C) annotation D) proteomics E) none of the above 28. Base sequence variations between individuals that result from point mutations are called A) polymorphs. B) small nuclear polymorphisms. C) deletions D) single nucleotide polymorphisms. E) restriction fragment length polymorphisms.

Explanation / Answer

25- [C] cells are poorly differentiated, they lose their morphological features.

26- [E] all given options are correct.

27- [D] proteomics, because proteins are gene products.

28- [E] RFLP occurs due to point mutations

29- [B] Guanine is a purine

30- [B] because ribose contains 2'OH group and deoxyribose don't.

31- [A] reason stated above.

32- [c] specific palindrome sequences are recognized by such enzymes.

33- [b] 22% because A+T=56% AND G+C= 44%, C=22%

34- [A] the unknown organism has higher G+C content

35- [D] there is additional gain of site for BamH1

36- [E] they are dispersed throughout genome and are associated with Alu

37- [D] hind II with given sequence

38- [c] prokaryotes lack introns

39-[b] husband is not the father is the suspected lover who is the father because bands are matching up with the child.

40- [b]- 0.1% as humans are 99.9% similar to each other

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