Search on google for images of proteins and DNA, in particular those showing their atomic structures. Write captions on the images you select, one for a protein and one for DNA, and a brief description to introduce these figures. (Familiarizing yourselves with structures of proteins and DNA will help you work out the following problems.) (a) Draw the complete linear structure of a small peptide sequence GAKD. (b) At pH=7.0, how many net charges does this peptide carry? A TATA box often occurs upstream of a gene in DNA. Draw the linear strand of a TATA sequence, showing base and sugar rings, as well as the phosphate groups.
Proteins
We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.
Protein Expression
The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.
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Amino acids are linked together the means of peptide bonds. This arrangement results in the formation of a polypeptide chain.
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