Cobalt has three radioactive isotopes used in medical studies. Atoms of these isotopes have 30, 31, and 33 neutrons, respectively. Choose the symbol for each of these isotopes. (Select all that apply.)

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alsk101

01.11.2020

Chemistry

Answer : The length of protein will be, 96.8 A⁰

Explanation :

First we have to calculate the amino acid residue.

$\text{Amino acid residue}=\frac{\text{Length of single strand of protein}}{\text{Mean residue mass}}$

Given:

Length of single strand of protein = 71.0 kDa

Mean residue mass = 110 Da

$\text{Amino acid residue}=\frac{71.0kDa}{110Da}=\frac{71000Da}{110Da}=645.4$

Now we have to calculate the number of turns in protein.

$\text{Number of turns in protein}=\frac{\text{Amino acid residue}}{3.6\text{amino acid per turn of the alpha-helix}}$

As there are 3.6 amino acid per turn of the alpha-helix.

$\text{Number of turns in protein}=\frac{645.4}{3.6}=179.28$

Now we have to calculate the length of the protein.

$\text{Length of protein}=\text{Number of turns in protein}\times \text{Length of each turn}$

As, we know that the length of each turn = 0.54 A⁰

$\text{Length of protein}=179.28turns\times \0.54\AA=96.8\AA$

Thus, the length of protein will be, 96.8 A⁰

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