Which choice CORRECTLY lists the molecular masses from smallest to largest?
A) 18 kDa

Question

Which choice CORRECTLY lists the molecular masses from smallest to largest?
A) 18 kDa < 15,000 Da < 15,100 amu < 1.8 MDa < 1.8 mDa
B) 1.8 mDa < 15,000 Da < 15,100 amu <18 kDa < 1.8 MDa
C) 1.8 MDa < 15,000 Da < 15,100 amu <18 kDa < 1.8 mDa
D) 1.8 mDa < 15,100 amu < 15,000 Da <18 kDa < 1.8 MDa
E) 1.8 MDa < 18 kDa < 15,100 amu < 1.8 mDa <15,000 Da

Quizplus · Accepted Answer

The correct order is:
15,100 amu < 15,000 Da < 18 kDa < 1.8 MDa < 1.8 mDa
amu stands for atomic mass unit, which is the mass of a proton or neutron, so it is the smallest unit. Da stands for dalton, which is also the same as atomic mass unit, but the term is commonly used for larger molecules. kDa, MDa, and mDa are kiloDalton, megaDalton, and milliDalton respectively, which are larger units used for even larger molecular masses. Therefore, the correct order is from smallest to largest: amu < Da < kDa < MDa < mDa, and the correct choice is B.

Which Choice CORRECTLY Lists the Molecular Masses from Smallest to Largest