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Example Questions
Example Question #1 :Protein Structure And Functions
Which proteins are generally water-soluble?
Fibrous proteins
Globular proteins
Both globular fibrous proteins
Neither globular nor fibrous proteins
Globular proteins
In a globular protein, the amino acid chain can twist in a way that polar groups lie at the protein's surface. This allows the protein to interact with water and enhances the protein's solubility in water. This does not occur in fibrous proteins, so fibrous proteins are insoluble in water.
Example Question #1 :Globular And Fibrous Proteins
Which of the following is false about actin filaments?
Growth of the actin chain occurs at the plus (+) end
2 microfilaments combine to make a coiled filament
They require GTP for assembly
Nucleotide hydrolysis promotes dissociation of actin filaments
They are made up of G-actin
They require GTP for assembly
Actin chain growth occurs at the (+) end of the chain, and nucleotide hydrolysis promotes dissociation of actin chains. 2 microfilaments of G-actin monomers make 1 filament of F-actin. However, actin filament assembly is powered by ATP, not GTP.
Example Question #11 :Protein Structure And Functions
An O-linked glycoprotein has a sugar attached to an oxygen atom on what amino acid(s)?
Methionine only
Serine or threonine
Serine only
Methionine or threonine
Threonine only
Serine or threonine
An O-linked glycoprotein is a protein that has a sugar attached to it. It is called O-linked because the sugar is attached to an oxygen atom on either a threonine residue or a serine residue within the protein.
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