BIOLOGY
PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Myoglobin
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Hemoglobin
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Insulin
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Catalase
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Detailed explanation-1: -Quaternary structure exists in proteins consisting of two or more identical or different polypeptide chains (subunits). These proteins are called oligomers because they have two or more subunits. The quaternary structure describes the manner in which subunits are arranged in the native protein.
Detailed explanation-2: -Many naturally-occurring proteins and enzymes are multimeric. Examples include: oligomeric: hemoglobin, DNA polymerase, nucleosomes and multimeric: ion channels, microtubules and other cytoskeloton proteins.
Detailed explanation-3: -Catalase (CAT) Catalase is a tetrameric heme protein and detoxifies H2O2 into oxygen and water. It is a metalloprotein oxidoreductase enzyme and efficiently scavenges H2O2 when it is present in high concentrations (Day 2009, Cao et al., 2003). It is present in peroxisomes.
Detailed explanation-4: -Descriptive of a protein composed of several subunits.