Explanation:
Differentiation in cells occurs due to the silencing of some genes in the DNA of the cell while leaving others open to RNA polymerase enzymes.
Silencing occurs through the mediation of histones that tightly coil up DNA into heterochromatin in some regions. This way the genes in these regions are inaccessible to transcription enzymes and proteins and cannot be expressed. This means that proteins associated with these genes are not produced.
The open genes, on the other hand, in the euchromatin region, produce the necessary proteins that are associated with the determined function of the cell.
An example is that while the hepatocytes cells and brain cells of the same person have the same DNA, the genes for producing bile are silenced in the brain cells (and are open in hepatocytes) while genes responsible for producing neurotransmitters are silenced in hepatocytes but open in brain cells.
Learn More:
For more on gene silencing check out;
brainly.com/question/12777212
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Answer:
D. organelles —› organism
Explanation:
Paramecium is a eukaryotic organism, which have a well-organized cell. Paramecium is a single-cell protist that have specialized membrane-bound organelles and nucleus that enable it to perform all life functions independently. These organelles are made up of atoms and macromolecules. The association of different unique organelles make up the paramecium which is a single-celled organism. “organelles —› organism” best represents the level of organization in a paramecium.
Answer:
B. Both DNA and RNA molecules
Explanation:
Both DNA and RNA contain adenine (A) and guanine (G) and, cytosine (C).
But, DNA contains thymine (T), whereas in RNA, it's replaced with uracil (U).
