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The lac operon is an brilliant example of negative control or negative regulation of gene expression in which they bound repressor stops transcription of the structural genes. The Positive control or positive regulation of gene expression is when the regulatory protein binds to enhances and DNA the rate of transcription. In that case the regulatory protein is called as an activator. The CAP or CRP included in regulating the lac operon is a good instance of an activator. Thus the lac operon is subject to both positive and negative control.
What is Cilia and Flagella? The surfaces of many eukaryotic cells bear cilia or flagella, built from specialized microtubules. Cilia are tiny brushlike hairs, and flagella are
Even though hydrogen bonds are considered weak chemical bonds, why they are so important, give an example.
Q. On which organelle of the cell structure does intracellular digestion depend? What is the chemical content of those organelles? Intracellular digestion take place by the act
Define Energy Expenditure in Hot Environments? Energy expenditure in hot environments is increased by a small but significant amount because of additional work of ventilation a
Origin and Evolution of Metazoa Most of the early metazoans were soft bodied and so their fossils are rare. The extremely fragmented fossil record does not shed any specific l
Differance between pulsus bigerniny or trigeminy and presence of bruit ? Pulsus bigerniny or trigeminy: After every 2nd or 3rd beat respectively there will be a longer inter
Explain Point Mutations gene? Mutations involving single genes occur by addition, substitution, or deletion of a single base in DNA. Such mutations, called point mutations, ca
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Explain about Bone lining cells Bone lining cells are basically inactive osteoblasts (in terms of making bone) that line bone surfaces. Osteocytes are osteoblasts that have be
How is the genetic determination of sex established in humans? In the diploid genome of human beings there are 46 chromosomes, 44 of them are autosomes and two are sex chromoso
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