Describe the relationship between primary, secondary, tertiary, and quaternary structure in proteins
What will be an ideal response?
The primary structure of a protein is the sequence of amino acids in a polypeptide chain; it is this
sequence that determines what folds and bonds the chain can make for other levels of structure. The
secondary structures are the twists and arrangements of the polypeptide chain into forms such as
random coils, ? helices, and ? sheets based on what, if any, hydrogen bonds between parts of the
polypeptide backbone can form. The secondary structure provides the framework for the tertiary
structure, which is the overall three-dimensional shape of a single polypeptide chain. Interactions
between the amino acid side groups combine with secondary structure to determine tertiary structure.
If a protein is made up of more than one strand of amino acids, then the interactions between strands to
provide the final three-dimensional shape of the overall protein is the quaternary structure.
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The roof of the mouth:
What will be an ideal response?
In principle, how many different cell types can an organism having four different types of transcription regulator and thousands of genes create?
(a) up to 4 (b) up to 8 (c) up to 16 (d) thousands