How is the size of molecules under analysis measured
(a) By measuring the distance moved through a ruler
(b) By measuring the amount of visualizing dye used
(c) By running a standard molecule whose size is known in parallel
(d) There is no exact criteria for doing so
Correct answer: (C) By running a standard molecule whose size is known in parallel
Explanation:
To determine the size of molecules (e.g., DNA, RNA, or proteins) during electrophoresis, a standard molecular marker (also called a ladder) is run alongside the sample.
- The marker contains fragments of known sizes, allowing for comparison with the unknown sample.
- By comparing the migration distance of the sample with the standard, the size of the unknown molecule can be estimated.
Why Not the Other Options?
-
(A) By measuring the distance moved through a ruler ❌
- Distance alone does not determine size because migration depends on multiple factors, including gel concentration and voltage.
- A standard ladder is necessary for accurate size determination.
-
(B) By measuring the amount of visualizing dye used ❌
- Dye intensity relates to the amount of sample present, not the size of the molecule.
-
(D) There is no exact criteria for doing so ❌
- There is a standard method—using a molecular weight marker or ladder for comparison.
Final Answer:
✅ (C) By running a standard molecule whose size is known in parallel
69 Comments
Akshay mahawar
February 25, 2025Doubt
Mahima Sharma
August 24, 2025Ans c molecule size known
Nisha
February 25, 2025Complete
Suman bhakar
February 26, 2025My answer not correct
Arushi
February 26, 2025Answer c☑️
Parul
February 27, 2025Easily understood. Done sir
Pooja jat
February 27, 2025Done.
Lavanya Sharma
February 27, 2025✅
Prami Masih
February 27, 2025👍👍👍
yogesh sharma
February 28, 2025Done sir
Lokesh kumawat
March 1, 2025Done
Abhilasha
March 1, 2025Done sir
VIKRAM GAHLOT
March 7, 2025👍
Anita choudhary
April 19, 2025✅
Anurag Giri
August 13, 2025Ans 3 To determine the size of molecules during electrophoresis, a standard molecular marker (also called a ladder) is run alongside the sample.
Khushi Agarwal
August 13, 2025Size of molecules analyse measure by running a std molecule whose size is known in parallel that is called ladder
Aman Choudhary
August 13, 2025option c is correct bcz of ladder
Soniya Shekhawat
August 13, 2025Ladder sequence have running a standard molecule that is whose size is parallel is used to detect unknown molecules so answer 3th is correct.
Anjani sharma
August 14, 2025Answer 3 ,there is a ladder of known sequence which is used to detect unknown samples
Mitali
August 14, 2025(C) By running a standard molecule whose size is known in parallel
Priya dhakad
August 14, 2025By running a standard molecule whose size is known in parallel.
Mansukh Kapoor
August 14, 2025The correct answer is option 3rd
To determine the size of the band during the electrophoresis we to run a standard band (ladder)parallel to our sample
Karishma Don
August 14, 2025the ladder or standard molecule is run parallel to the unknown sample and by comparison with unknown sample
Sneha Kumawat
August 14, 2025The correct answer is C by running a standard molecule whose size is known in parallel
Roopal Sharma
August 14, 2025Ladder isd used
Dipti Sharma
August 14, 2025C) By running a standard molecule whose size is known in parallel called ladder.
Deepika Sheoran
August 14, 2025Option c is correct
Because by running a standard molecule whose size is known in parellel is called ladder. Detect unknown molecules.
Neelam Sharma
August 14, 2025running a standard molecule whose size is known in parallel
Monika jangid
August 14, 2025By running a standard molecule whose size is parallel known as ladder
Priyanka choudhary
August 14, 2025Correct answer is option 3rd
Priti khandal
August 14, 2025Option C is right by running a standard molecule whose size is known in parallel
Priya khandal
August 14, 2025Bye running a standard molecular whose size is know in pareller
shruti sharma
August 15, 2025correct ans is c
Shivani
August 15, 2025Ans.- C
By running a standard molecule whose size is known .
Aafreen
August 17, 2025Ans -3
By running a standard molecule whose size is known in parallel
Divya rani
August 16, 2025Yes correct answer is C because unknown molecules k size ko identify krne k liye ek known size ka molecule unknown k parallel m chahiye jisko ladder bolenge
Manisha gujar
August 17, 2025C option is correct known sample is running from ladder in parellel
Manisha gujar
August 17, 2025Option c is correct
Kajal
August 17, 2025Option c is right
By running standard molecule whose size is known in parallel
Avni
August 17, 2025correct option is (C)
Simran Saini
August 18, 2025Option c.
By running a standard molecule whose size is known in parallel.
Neeraj Sharma
August 18, 2025Option C by adding or running known molecular weight molecule in the parallel so the molecule size is estimated via relative distance
Bharti Yadav
August 24, 2025Size of molecules are measured by running known molecules in parallel.
Priyanka Choudhary
August 24, 2025Option c is correct answer,
By running a standard molecule whose size is known in parallel
Bhavana kankhedia
August 24, 2025By running a standard molecule whose size is known in parallel
Sonam Saini
August 24, 2025By running standard models of known size in parallel to generate small size
Alec
August 24, 2025option c – by running a standard molecule of known size in parallel.
Aartii sharma
August 24, 2025By running a standard molecule of known size in parallel
Anjali
August 24, 2025Ans c is correct
Anju
August 24, 2025Ans : c
Ladder is use because its size is already known to us
Falguni Prakash
August 24, 2025C
Kashish yadav
August 25, 2025Ok sir
Ayush Dubey
August 25, 2025By running a standard molecule whose size is known in parallel
sakshi khatri
August 25, 2025done
Pratibha Jain
August 30, 2025Correct answer is option (C)
By running a standard molecule whose size is known in parallel
Shriyanshi verma
August 30, 2025Size of molecules analyse measure by running a std molecule whose size is known in parallel that is called ladder
Sheikh Aleen
August 30, 2025By running a standard molecule whose size is known in parallel
Patel Radha
August 30, 2025By running a standard molecule whose size is parallel known as ladder
Anisha Beniwal
August 31, 2025Option C is correct -By running a standard molecule whose size is known in parallel
Vanshika Sharma
August 31, 2025By running a standard molecule whose size is known in parallel
Komal Sharma
August 31, 2025To determine the size of molecules (e.g., DNA, RNA, or proteins) during electrophoresis, a standard molecular marker (also called a ladder) is run alongside the sample.
Shobha Kanwar
August 31, 2025Answer 3 ,there is a ladder of known sequence which is used to detect unknown samples
Aartii sharma
September 1, 2025By running a standard molecule whose size is known in parallel
Anisha jakhar
September 3, 2025Correct answer is (C) By running a standard molecule whose size is known in parallel
Muskan Yadav
September 3, 2025By running a standard molecule whose size is known in parallel
Somya Yadav
September 5, 2025By running a known standard molecule with known in parallel
Ajay Sharma
September 6, 2025By running a standard molecule whose size is known in parallel
Meera Gurjar
September 13, 2025By running a standard molecule whose size is known in parallel
Aakansha sharma Sharma
October 1, 2025Correct answer: (C) By running a standard molecule whose size is known in parallel