Which of the following is a change in the sequence that leads to formation of a stop codon?
missense mutation
nonsense mutation
silent mutation
deletion mutation

-nonsense mutation

Explanation:

Non-sense mutations can be described as mutations that to formation of a non-sense or stop codon in mRNA made from mutated gene. There are a  total of 64 codons, out of which 61 code for specific amino acids and 3 codons act as stop codon or non-sense codons.

As these codons provide signal for termination of transcription, non-sense mutations lead to formation of a incomplete or truncated proteins due to premature termination of translation.

Thus, the correct answer is  'second option.'

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.