Question

complete the following sentences to describe the various levels of protein structure. then place the sentences in order with the simplest level of organization first.
drag the text blocks below into their correct order.
nucleotides
when two or more polypeptides bond together into a working protein, it represents a ________ structure.
primary
once amino acids begin to form bonds with one another to create helical or sheet - like formations, a ________ structure is formed.
amino acids
the final folded three - dimensional shape of a polypeptide is referred to as a proteins ________ structure.
secondary
quaternary
a sequence of ______ strung together in a strand forms a ______ structure.
tertiary

Explanation:

First Sentence (Quaternary Structure)

• Explanation: Quaternary structure of a protein is defined by the association of two or more polypeptide chains (subunits) to form a functional protein. So the blank here should be filled with "quaternary".

Second Sentence (Secondary Structure)

• Explanation: Secondary structure of proteins involves the folding of the polypeptide chain into regular structures like alpha - helices and beta - sheets, which are formed by hydrogen bonds between amino acid residues. So the blank here is "secondary".

Third Sentence (Tertiary Structure)

• Explanation: Tertiary structure is the overall three - dimensional folding of a single polypeptide chain, which is the final folded shape of a polypeptide. So the blank here is "tertiary".

Fourth Sentence (Amino Acids and Primary Structure)

• Explanation: The primary structure of a protein is the linear sequence of amino acids linked together by peptide bonds. So the first blank (the building blocks) is "amino acids" and the second blank (the structure) is "primary".

Now, arranging the sentences in order from the simplest (primary) to more complex:

1. "A sequence of \(\boldsymbol{\text{amino acids}}\) strung together in a strand forms a \(\boldsymbol{\text{primary}}\) structure."
2. "Once amino acids begin to form bonds with one another to create helical or sheet - like formations, a \(\boldsymbol{\text{secondary}}\) structure is formed."
3. "The final folded three - dimensional shape of a polypeptide is referred to as a protein’s \(\boldsymbol{\text{tertiary}}\) structure."
4. "When two or more polypeptides bond together into a working protein, it represents a \(\boldsymbol{\text{quaternary}}\) structure."

Filled Sentences:

• When two or more polypeptides bond together into a working protein, it represents a \(\boldsymbol{\text{quaternary}}\) structure.
• Once amino acids begin to form bonds with one another to create helical or sheet - like formations, a \(\boldsymbol{\text{secondary}}\) structure is formed.
• The final folded three - dimensional shape of a polypeptide is referred to as a protein’s \(\boldsymbol{\text{tertiary}}\) structure.
• A sequence of \(\boldsymbol{\text{amino acids}}\) strung together in a strand forms a \(\boldsymbol{\text{primary}}\) structure.

Answer:

First Sentence (Quaternary Structure)

• Explanation: Quaternary structure of a protein is defined by the association of two or more polypeptide chains (subunits) to form a functional protein. So the blank here should be filled with "quaternary".

Second Sentence (Secondary Structure)

• Explanation: Secondary structure of proteins involves the folding of the polypeptide chain into regular structures like alpha - helices and beta - sheets, which are formed by hydrogen bonds between amino acid residues. So the blank here is "secondary".

Third Sentence (Tertiary Structure)

• Explanation: Tertiary structure is the overall three - dimensional folding of a single polypeptide chain, which is the final folded shape of a polypeptide. So the blank here is "tertiary".

Fourth Sentence (Amino Acids and Primary Structure)

• Explanation: The primary structure of a protein is the linear sequence of amino acids linked together by peptide bonds. So the first blank (the building blocks) is "amino acids" and the second blank (the structure) is "primary".

Now, arranging the sentences in order from the simplest (primary) to more complex:

1. "A sequence of \(\boldsymbol{\text{amino acids}}\) strung together in a strand forms a \(\boldsymbol{\text{primary}}\) structure."
2. "Once amino acids begin to form bonds with one another to create helical or sheet - like formations, a \(\boldsymbol{\text{secondary}}\) structure is formed."
3. "The final folded three - dimensional shape of a polypeptide is referred to as a protein’s \(\boldsymbol{\text{tertiary}}\) structure."
4. "When two or more polypeptides bond together into a working protein, it represents a \(\boldsymbol{\text{quaternary}}\) structure."

Filled Sentences:

• When two or more polypeptides bond together into a working protein, it represents a \(\boldsymbol{\text{quaternary}}\) structure.
• Once amino acids begin to form bonds with one another to create helical or sheet - like formations, a \(\boldsymbol{\text{secondary}}\) structure is formed.
• The final folded three - dimensional shape of a polypeptide is referred to as a protein’s \(\boldsymbol{\text{tertiary}}\) structure.
• A sequence of \(\boldsymbol{\text{amino acids}}\) strung together in a strand forms a \(\boldsymbol{\text{primary}}\) structure.