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9.Biotechnology Principals and Process
medium
Upon exposure to UV radiation, DNA stained with ethidium bromide will show
A
Bright orange colour
B
Bright red colour
C
Bright blue colour
D
Bright yellow colour
(NEET-2023)
Solution
Option $(1)$ is the correct answer because in recombinant $DNA$ technology the separated $DNA$ fragments can be visualised only after staining the $DNA$ with a substance known as ethidium bromide followed by exposure to $U.V.$ radiation. You can see bright orange coloured bands of $DNA$ in an ethidium bromide stained gel exposed to $U.V.$ light.
Standard 12
Biology
Similar Questions
Match the column – $I$ with column – $II$ with respectto the nomenclature of enzyme Eco RI and select the correct answer from codes given below.
| Column $- I$ | Column $- II$ |
| $(A)\; E$ | $(1)$ $1^{st}$ in order of identificaiton |
| $(B)\;Co$ | $(2)$ Name of genus |
| $(C)\; R$ | $(3)$ Name of species |
| $(D)\; I$ | $(4)$ Name of strain |
medium
Match the columns :
| Column – $I$ | Column – $II$ |
| $(a)$ Ligase | $(i)$ It removes nucleotide from $DNA$ end. |
| $(b)$ Endonuclease | $(ii)$ Connects parts of $DNA$ |
| $(c)$ Exonuclease | $(iii)$ Removes phosphates of $DNA$ |
| $(d)$ $DNA$ Polymerase | $(iv)$ It produces sticky ends in $DNA$ |
| $(v)$ Useful to get repeated amplification |
medium
