Answer:
Two groups of proteins, called cyclins and cyclin-dependent kinases (Cdks), are responsible for the progress of the cell through the various checkpoints. Cyclins regulate the cell cycle only when they are tightly bound to Cdks.
Explanation:
None of them will have green seeds.
If the two genotypes are YY and Yy, the combinations from the Punnett squares will be YY, YY, Yy, and Yy. All of these possible combinations have the dominant trait (yellow seeds), so none of them will have green seeds.
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<h2>Regulation </h2>
Explanation:
Operons are the structural unit of gene organisation
If product of regulatory gene binds to the upstream of promoter and induce expression of operon genes, system is called positively controlled whereas if product of regulatory gene binds to the operator and prevents expression of operon genes, system is called negatively controlled
An inducer binds to the repressor and induce conformational changes causing dissociation of repressor from operator therefore in absence of repressor RNA Polymerase binds to the promoter and starts transcription of genes
In some cases, A co-repressor binds to the repressor and activate it as a result activated repressor binds to the operator and prevent binding of RNA Polymerase thus blocks transcription of structural genes
Answer:
1.All living things are composed of cells.
2.Cells are the basic units of structure and function for living things.
3.All cells come from pre-existing cells. Also, organisms grow by “adding on more cells” NOT by increasing the size of their cells.
Water is a polar covalent molecule. That is because it shares electrons between the atoms unequally.