Answer:
c. binds to allolactose and becomes inactive, allowing lac gene expression to occur.
Explanation:
Interaction between allolactose and repressor leads to allosteric repulsion which makes repressor inactive leading to the lac gene expression. This is the reason why allolactose is known as the inducer of lac operon becasue it causes gene expression in lac operon.
In the absence of allolactose, the repressor binds the operator and does not allow RNA polymerase to do transcription.
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Answer:
The correct answer is A, as the statement is true. The enzyme catchol-o-methyl transferase (COMT) in the nervous system is important in the degradation of catecholamines by neuroglia cells.
Explanation:
Catechol-O-methyltransferase, abbreviated as COMT, is one of several enzymes in the body involved in the degradation of catecholamines such as dopamine, norepinephrine and adrenaline. The enzyme works by transferring a methyl group to the signal substance from the SAM donor group (S-adenosylmethionine).
Answer:
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It is believed that the dinoursars diminished from earth through a massive meteorite which weight 2 trillion tons which hit the earth causing maximum heat and it killed all the dinoursars
Explanation:
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<span>The number of electrons in the valence shell of an element is the principal determinant factor of the kind of chemical bonding it will be involved in. For an element that has only one electron in its outermost shell, such an element will donate the electron to another element which need only one electron. Thus, such an element will undergoes electrovalent bonding. For an element which have four electrons in its outermost shell, such element will prefer to share the electrons will other elements who need such in order to become stable, thus, such element will undergo covalent bonding.</span>
