Molecular biology

Ligation ratio: practice problems

Work out the result for ligation ratio. Every answer here is computed by the same tested calculator the rest of the site uses, so a solution can never drift away from the maths.

Problem 1 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 20
  • Vector length (bp): 4000
  • Insert length (bp): 1000
  • Insert : vector ratio: 3
Show the answer and the working

Use 15 ng of insert with 20 ng of vector (3:1).

  1. Length ratio: insertBp / vectorBp = 0.25
  2. Substitute: 3 · 20 ng · (1000 / 4000) = 15 ng

Open this in the calculator to change the numbers.

Problem 2 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 15
  • Vector length (bp): 2000
  • Insert length (bp): 1000
  • Insert : vector ratio: 2.5
Show the answer and the working

Use 18.75 ng of insert with 15 ng of vector (2.5:1).

  1. Length ratio: insertBp / vectorBp = 0.5
  2. Substitute: 2.5 · 15 ng · (1000 / 2000) = 18.75 ng

Open this in the calculator to change the numbers.

Problem 3 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 10
  • Vector length (bp): 5000
  • Insert length (bp): 1000
  • Insert : vector ratio: 3.5
Show the answer and the working

Use 7 ng of insert with 10 ng of vector (3.5:1).

  1. Length ratio: insertBp / vectorBp = 0.2
  2. Substitute: 3.5 · 10 ng · (1000 / 5000) = 7 ng

Open this in the calculator to change the numbers.

Problem 4 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 20
  • Vector length (bp): 5000
  • Insert length (bp): 1000
  • Insert : vector ratio: 3
Show the answer and the working

Use 12 ng of insert with 20 ng of vector (3:1).

  1. Length ratio: insertBp / vectorBp = 0.2
  2. Substitute: 3 · 20 ng · (1000 / 5000) = 12 ng

Open this in the calculator to change the numbers.

Problem 5 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 75
  • Vector length (bp): 5000
  • Insert length (bp): 5000
  • Insert : vector ratio: 3.5
Show the answer and the working

Use 262.5 ng of insert with 75 ng of vector (3.5:1).

  1. Length ratio: insertBp / vectorBp = 1
  2. Substitute: 3.5 · 75 ng · (5000 / 5000) = 262.5 ng

Open this in the calculator to change the numbers.

Problem 6 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 20
  • Vector length (bp): 1000
  • Insert length (bp): 1000
  • Insert : vector ratio: 3.5
Show the answer and the working

Use 70 ng of insert with 20 ng of vector (3.5:1).

  1. Length ratio: insertBp / vectorBp = 1
  2. Substitute: 3.5 · 20 ng · (1000 / 1000) = 70 ng

Open this in the calculator to change the numbers.

Problem 7 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 25
  • Vector length (bp): 5000
  • Insert length (bp): 4000
  • Insert : vector ratio: 5
Show the answer and the working

Use 100 ng of insert with 25 ng of vector (5:1).

  1. Length ratio: insertBp / vectorBp = 0.8
  2. Substitute: 5 · 25 ng · (4000 / 5000) = 100 ng

Open this in the calculator to change the numbers.

Problem 8 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 75
  • Vector length (bp): 3000
  • Insert length (bp): 4000
  • Insert : vector ratio: 1
Show the answer and the working

Use 100 ng of insert with 75 ng of vector (1:1).

  1. Length ratio: insertBp / vectorBp = 1.333
  2. Substitute: 1 · 75 ng · (4000 / 3000) = 100 ng

Open this in the calculator to change the numbers.

Problem 9 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 20
  • Vector length (bp): 3000
  • Insert length (bp): 1000
  • Insert : vector ratio: 6
Show the answer and the working

Use 40 ng of insert with 20 ng of vector (6:1).

  1. Length ratio: insertBp / vectorBp = 0.3333
  2. Substitute: 6 · 20 ng · (1000 / 3000) = 40 ng

Open this in the calculator to change the numbers.

Problem 10 Ligation ratio

Work out the result for ligation ratio.

  • Vector mass (ng): 15
  • Vector length (bp): 5000
  • Insert length (bp): 1000
  • Insert : vector ratio: 3
Show the answer and the working

Use 9 ng of insert with 15 ng of vector (3:1).

  1. Length ratio: insertBp / vectorBp = 0.2
  2. Substitute: 3 · 15 ng · (1000 / 5000) = 9 ng

Open this in the calculator to change the numbers.

More molecular biology practice

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