.. Which of the following statements is NOT an accurate statement about thymidin
ID: 205876 • Letter: #
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.. Which of the following statements is NOT an accurate statement about thymidine 4 Thymidine dimers can cause the DNA replication machinery to stall. B. Thymidine dimers are covalent links between thymidines on opposite DNA stranos C. Prolonged exposure to sunlight causes thymidine dimers to form. D. Repair proteins recognize thymidine dimers as a distortion in the DNAad 35. The DNA mismatch repair system does all of these EXCEPT Corrects mistakes made by DNA replication machinery . Excises the mismatched base and replaces it Replaces the base on the unmethylated strand Recognizes the new strand as the strand with methylated A Two of these are NOT correct 36. Which of these is NOT correct concerning apoptosis? Apoptosis is programmed cell death B. Apoptosis proceeds due to the activation of caspases. C. During apoptosis, the cell remnants are engulfed by phagocytosis. D. The nucleus remains intact during apoptosis. Two of these are NOT correct. 37. Apoptosis can be triggered by which of these events? when cells are infected by viruses When the cell encounters leucine zippers When lysosomes become leaky and release cytochrome c into the nucleus When the cell receives tumor necrosis factor as a signal Two of these are correct. 38. Base excision repair corrects single damaged bases by removing the base using the enzyme endonuclease exonuclease D glycosylase Epolymerase phosphatase 39. Which of these is NOT correct concerning the nucleus? A. The nucleus is the site for DNA and RNA synthesis The nucleus has a double membraned nuclear envelope that is continuous with the Golgi Complex. The nuclear pore complex serves as a security gate for the nucleus. D. The nucleolus is involved in ribosome formation. E. Two of these statements are not correct Second Position UAA Stop UGAStop A CCG GUC Val GCA GCC Alo GAA GGG GCGExplanation / Answer
Q34).Thymine diner are fformed as a result of exposure to sunlight(uv rays ).they are formed on same starnd and are corrected by the DNA repair mechanism .
Q35)DNA mismatch repair is a DNA repair mechanism ,that help to replace the wrongly paired bases by excising them .for these purpose they use DNA endonucleases .they attack only the daughter strand .
But they identify the daughter strand by the fact that it it unmethylated at GATC sequence .
36)Apoptosis is a programmed cell death that occur due to activation of capsaces ,in these the nucleas is also destroyed .at last apoptotic body are formed which are engulfed by macrophages.
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