Answer:
Quaternary structure
Explanation:
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A protein can be characterized by:
Primary structure: it is the linear sequence of amino acids.
Secondary structure: The amino acid sequence is folded by intermolecular interactions.
Tertiary structure: A greater folding of amino acids is observed by intermolecular interactions and disulfide bridges.
Quaternary structure: Two or more chains of folded amino acids join to form a new, more complex structure.
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Answer:
A. They must be kept separate from moisture and oxygen
Explanation:
Alkali metals refers to a group of chemical elements in the periodic table. It is the common name given to Group 1 elements (excluding hydrogen). They are generally metallic in nature with physical properties like shining lustre, silvery in appearance etc. Alkali metals include lithium, Pottasium, Sodium, Rubidium etc.
One important chemical property of alkali metals is their high reactivity i.e. they tend to react quickly with other substances. For example, alkali metals react vigorously with water to form hydroxides. They also react with oxygen to form oxides. Due to this highly reactive properties, they are kept or stored away from moisture (water) and oxygen (present in air).
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Explanation:
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