Import Question JSON

Current Question (ID: 16251)

Question:

Following are the steps in the formation of recombinant DNA by action of a restriction endonuclease. Which one of the given option incorrectly identifies the steps, components labelled as A, B, C, and D?

Options:

1. A - Exonuclease cuts the DNA between bases G and A only when the sequence GAATTC is present in the DNA
2. B - Sticky ends are formed.
3. C - The DNA fragments join at sticky ends by DNA ligase.
4. D - Restriction enzyme Eco RI cuts the strand of DNA a little away from centre of the palindromic sites, but between the same two bases on the opposite strands

Solution:

The incorrect statement is option 1. Exonuclease is not involved in cutting DNA at specific sequences like GAATTC. This is the function of restriction endonucleases like Eco RI.

Import JSON File

Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}