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2 years ago

Classify each of the following as a physical or a chemical change. Give

Chemistry

1 answer:

hjlf2 years ago

5 0

Answer:

a is a physical changes

b is physical changes

c is a Chemical change

d is a physical changes

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On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature

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2 years ago

Which of these is a base ? a.vinegar b.NaOH c.HNO3 d.HCI

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3 years ago

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What is the relationship between frequency and velocity of a wave direct inverse or no relationship

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3 years ago

Alpha helices are a type of secondary structure in proteins. What is the length of a 27.0 kDa single‑stranded α‑helical protein

iogann1982 [59]

Answer : The length of protein will be, 36.8 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 = 27.0 kDa

Mean residue mass = 110 Da

$\text{Amino acid residue}=\frac{27.0kDa}{110Da}=\frac{27000Da}{110Da}=245.4$

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.

$\text{Number of turns in protein}=\frac{245.4}{3.6}=68.17$

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

$\text{Length of protein}=68.17turns\times 0.54\AA=36.8\AA$

Thus, the length of protein will be, 36.8 A⁰

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3 years ago