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ho asked in 科學及數學生物學 · 1 decade ago

[bio] mc1題

iodine solution is a common stain used in microscopy.the purpose of staining living tissues with iodine solution is

A. to turn those structures with starch dark blue

B. to kill the cells by using up the starch reserve

C. to provide a brown background for better contrast

D. to highlight the nucleus

答案係d 點解唔係a????

Update:

咁個nucleus會變咩色?dark blue定brown?

佢可以染到nucleus既原理又係咩?

1 Answer

Rating
  • yau
    Lv 7
    1 decade ago
    Favorite Answer

    中文答

    雖然碘可以將澱粉變成深藍色

    但是觀察細胞時,加入碘並不是要以上的效果

    而是因為大多數細胞都是透明

    所以加入碘液的目的是把細胞染上顏色,令結構更明顯,方便觀察

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