Answer:
D) receptor tyrosine kinases
Explanation:
Protein kinase receptors are simply saying receptors with associated kinases (usually tyrosine kinases).
Protein kinases are enzymes that have the ability to modulate other enzymes (or some other proteins) by adding the phosphate group. This is known as phosphorilation process. As a result of structural change, protein can change its activity (phosphorilation usually increase the activity).
Such receptors are involved in a many processes within an organism that are important for the cellular growth, differentiation, metabolism
Answer:
Termination is the ending of transcription,and occurs when RNA polymerase crosses a stop ( termination) <em>sequ</em><em>ence</em><em> </em><em>in</em><em> </em><em>the</em><em> </em><em>gene.</em><em> </em><em>The</em><em> </em><em>mRNA</em><em> </em><em>strand</em><em> </em><em>is</em><em> </em><em>comp</em><em>lete</em><em>,</em><em>and</em><em> </em><em>it</em><em> </em><em>detaches</em><em> </em><em>from</em><em> </em><em>DNA</em>
In the absence of glucose and in the presence of lactose, the lac repressor is bound to the allolactose, and the lac operon can start.
<h3>What is the lac operon?</h3>
A lac operon is an inducible operon that is activated in the presence of lactose in the outer surroundings of the bacteria. Operon is a series of genes present in the bacterial DNA.
When the lactose is present, the repressors move to bind the allolactose, and as a result, the RNA polymerase can access the lac operon. The repressor has more affinity for allolactose than the operator. RNA polymerase, along with cAMP and CAP proteins, initiates the transcription of lac operon. The transcript has genes for galactosidase, permease, and transacetylase.
Hence, in the absence of glucose and in the presence of lactose, the lac repressor is bound to the allolactose.
Learn more about the lac operon, here
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