Proteins in Biochemistry
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Questions and Answers

Which element is not commonly found in proteins?

  • Sulfur (correct)
  • Nitrogen
  • Hydrogen
  • Carbon

What is the average nitrogen content of proteins by mass?

  • 5.4%
  • 10.3%
  • 20.5%
  • 15.4% (correct)

What is the main elemental composition of proteins?

  • Carbon, Hydrogen, Nitrogen, Oxygen, Sulfur
  • Carbon, Hydrogen, Nitrogen, Oxygen (correct)
  • Carbon, Hydrogen, Nitrogen, Oxygen, Sulfur, Iron
  • Carbon, Hydrogen, Nitrogen

What percentage of a cell's overall mass do proteins account for?

<p>15% (A)</p> Signup and view all the answers

What functional groups are attached to the alpha (a) carbon in amino acids?

<p>Amino and carboxyl groups (C)</p> Signup and view all the answers

Which of the following elements is commonly found in proteins?

<p>Carbon (B)</p> Signup and view all the answers

What is the primary function of proteins in cells?

<p>Structural support (B)</p> Signup and view all the answers

What is the elemental composition of proteins?

<p>Carbon, hydrogen, nitrogen, oxygen, phosphorus (C)</p> Signup and view all the answers

What is the average nitrogen content of proteins by mass?

<p>15.4% (D)</p> Signup and view all the answers

What functional groups are attached to the alpha (a) carbon in amino acids?

<p>Amino (-NH2) and carboxyl (-COOH) groups (A)</p> Signup and view all the answers

Which of the following is NOT a characteristic of proteins?

<p>Are branched polymers (C)</p> Signup and view all the answers

What is the elemental composition of proteins?

<p>Carbon, hydrogen, nitrogen, oxygen, and phosphorus (A)</p> Signup and view all the answers

What is the most abundant molecule in cells after water?

<p>Proteins (B)</p> Signup and view all the answers

What functional groups are attached to the alpha (a) carbon in amino acids?

<p>Amino (-NH2) and carboxyl (-COOH) groups (C)</p> Signup and view all the answers

What is the average nitrogen content of proteins by mass?

<p>15.4% (C)</p> Signup and view all the answers

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