B Large, multi. Endomitosis C. Stay inside mitochondria D. Can be found in endop
ID: 302666 • Letter: B
Question
B Large, multi. Endomitosis C. Stay inside mitochondria D. Can be found in endoplasmic reticulum 38 How many copies of ilentical DNA molecules could be found in polytene chromosomes? A. One to two thousands, could be lined up in paralle B. One million molecules C. One billion molecules D. None of the above 3 3. Up to how many copies polytene chromosomes could replicate? A. 200 copies B. I million C, 20 copies D. None of the above 39. What is the result of the parallel alignment in polytene chromosomes? A. Unique, complex pattern of light and dark bands B. Make cells more viable C. Make cells dead D. Stops cell division 34. What is the molecular basis of polytene chromosomes? A. The chromosomes are replicated in high number without cell division B. They are 23 pairs C. They divide by meiosis D. None of the above 40. From where did we extract these giant chromosome? A. In nuclei of salivary glands, 3d stage of larvae B. From adult Drosophila C. From maize D. From peas 35. Which kind of larvae should be selected to isolate polytene chromosomes A. A large third instar larvae just ready to pupate B. Larvae from dead fly B. Larvae from F1 generation D. Larvae from F2 generation 36. Who first discovered polytene chromosomes? A. Balbiani in 1881 in salivary glands of chironomus B. Thomas Morgan in 1881 C. Gregor Mendel in 18881 D. None of the above 37. What do dark bands and interbands reflect in polytene A. Reflects chromatin and DNA concentration respectively B. Reflects chromosomes and nucleus respectively C. Reflects mitochondria and endoplasmic reticulum respectively D. None of the aboveExplanation / Answer
33)The answer is none because the polytene chromosome produce repeated rounds of DNA replication but the cell division do not occur that forms a giant chromosome
34) the answer is A because cell division does not occur in polytene chromosomes but DNA replication occurs
35) the answer is A, 3rd instar larvae of living drosophila melanogater should be selected for isolation
36) answer A: polytene chromosomes were discovered by Balbiani in 1881 in salivary glands of chironomus midges
37)in my opinion answer woudld be B
dark bands reflect chromosomes and contain more DNA light bands are lightly stained with nuclear stains
38)the answer is A thousands of identical DNA molecules can be packed side by side
39)the answer is A because the parallel alignment produces a pattern of dark and light bands
40) It is isolated from the salivary gland of drosophila 3rd instar larvae
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