X-ray crystallography

Nuclear magnetic resonance (NMR) spectroscopy

Electron microscopy

All of the above

The sequence of amino acids in the protein

The three-dimensional structure of the protein

The number of amino acids in the protein

The molecular weight of the protein

The arrangement of amino acids into alpha helices and beta sheets

The three-dimensional structure of the protein

The number of amino acids in the protein

The molecular weight of the protein

The three-dimensional structure of the protein

The arrangement of amino acids into alpha helices and beta sheets

The number of amino acids in the protein

The molecular weight of the protein

The arrangement of multiple protein subunits into a single complex

The three-dimensional structure of the protein

The number of amino acids in the protein

The molecular weight of the protein

Hemoglobin

Myoglobin

Insulin

Cytochrome c

To catalyze chemical reactions

To transport molecules

To provide structural support

To regulate gene expression

All of the above

Enzymes

Antibodies

Hormones

Structural proteins

Hemoglobin

Myoglobin

Insulin

Cytochrome c

Collagen

Elastin

Keratin

Myosin

Transcription factors

Repressors

Activators

All of the above

A protein is a single polypeptide chain, while a polypeptide is a chain of amino acids that has not yet been folded into a functional protein.

A protein is a chain of amino acids that has been folded into a functional protein, while a polypeptide is a single polypeptide chain.

There is no difference between a protein and a polypeptide.

Proteins and polypeptides are both chains of amino acids.

A protein is a single polypeptide chain, while an enzyme is a protein that catalyzes a chemical reaction.

A protein is a chain of amino acids that has been folded into a functional protein, while an enzyme is a single polypeptide chain.

There is no difference between a protein and an enzyme.

Proteins and enzymes are both chains of amino acids.

A protein is a chain of amino acids, while a nucleic acid is a chain of nucleotides.

A protein is a chain of amino acids that has been folded into a functional protein, while a nucleic acid is a single polypeptide chain.

There is no difference between a protein and a nucleic acid.

Proteins and nucleic acids are both chains of amino acids.

A protein is a chain of amino acids, while a carbohydrate is a chain of sugars.

A protein is a chain of amino acids that has been folded into a functional protein, while a carbohydrate is a single polypeptide chain.

There is no difference between a protein and a carbohydrate.

Proteins and carbohydrates are both chains of amino acids.