Amino Acids and Proteins Quiz

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Questions and Answers

Which elements are present in proteins?

Carbon, hydrogen, nitrogen
Carbon, nitrogen, oxygen
Carbon, hydrogen, oxygen, nitrogen (correct)
Carbon, hydrogen, oxygen

What are the building blocks of proteins?

Carbohydrates
Amino acids (correct)
Fatty acids
Nucleic acids

How are amino acids linked together in proteins?

By covalent bonds
By hydrogen bonds
By peptide bonds (correct)
By ionic bonds

What is the term for a chain of three amino acids joined together?

<p>Tripeptide (D)</p>

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What is the difference between essential and non-essential amino acids?

<p>Essential amino acids cannot be made in the body and must be consumed, while non-essential amino acids can be made by the body from other proteins (A)</p>

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Study Notes

Protein Composition

Proteins are composed of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur
These elements are the building blocks of proteins

Amino Acids

Amino acids are the building blocks of proteins
There are 20 different amino acids that the human body uses to build proteins

Peptide Bonds

Amino acids are linked together in proteins through peptide bonds
Peptide bonds are formed through a condensation reaction, releasing water
This bond is strong and requires energy to break

Tripeptide

A chain of three amino acids joined together is called a tripeptide

Essential and Non-Essential Amino Acids

Essential amino acids cannot be synthesized by the human body and must be obtained through diet
Non-essential amino acids can be synthesized by the human body from other amino acids
There are 9 essential amino acids and 11 non-essential amino acids