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).
Length ratio: insertBp / vectorBp = 0.25 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).
Length ratio: insertBp / vectorBp = 0.5 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).
Length ratio: insertBp / vectorBp = 0.2 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).
Length ratio: insertBp / vectorBp = 0.2 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).
Length ratio: insertBp / vectorBp = 1 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).
Length ratio: insertBp / vectorBp = 1 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).
Length ratio: insertBp / vectorBp = 0.8 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).
Length ratio: insertBp / vectorBp = 1.333 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).
Length ratio: insertBp / vectorBp = 0.3333 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).
Length ratio: insertBp / vectorBp = 0.2 Substitute: 3 · 15 ng · (1000 / 5000) = 9 ng Open this in the calculator to change the numbers.
More molecular biology practice
Same topic, different calculation Resuspend a lyophilized primer to a stock concentration.
Convert a dsDNA mass to moles (and back) from its length.
DNA and RNA concentration and purity from absorbance.
Mass, molarity, and copies/µL for dsDNA, ssDNA, or ssRNA, both directions.
Stuck on one of them? Open it in the calculator and it shows the same working step by step, with the units checked and the hazards flagged. Free, no account, and it keeps working offline once the page has loaded.
Open the Ligation ratio calculator