6. Which of the following is true about E. coll's lac operon? If there is no lactose present, the operon catabolizes glucose to produce ATP The three genes of the lac operon (lacz. lacy and lacA) have their own promoters, thus they are transcribed separately. The lac operon repressor binds to the operator in order to activate and enhance the transcription of the three lac genes. The allolactose-repressor complex binds to the lac operon operator thereby increasing the expression of the operon.
Nucleotides
It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleic Acids
Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
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