Question

Identify the correct order of the size of the structures from the smallest to the largest.
I= Bacterium
II= Enzyme
III= Nucleus
IV= Chromosome
V= Molecule of water

• A. V- II- I- IV- III
• B. II- V- IV- I- III
• C. V- I- II- III- IV
• D. II- V- I- IV- III
• E. II-V-IV-III

Answer 1

Answer: (A)

A water molecule has two hydrogen and one oxygen atom and is smallest among the given options. An enzyme can be as small as a chain of 60 amino acid residues, while a bacterium ranges in 1 micrometre in diameter. The chromosome contains linear DNA molecule which is 2 m long. Nucleus diameter is 6 micrometers. The correct ascending order of size is water molecule, enzyme, bacterium, chromosome and nucleus.

So, the correct answer is option A.