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Elena-2011 [213]
4 years ago
15

Explain the following statement "digestion begins in the mouth"

Biology
1 answer:
larisa [96]4 years ago
8 0
When you take the food into your mouth and chew on it, your salivary glands secret enzymes called salivary amylase which is responsible for breaking down starch to smaller carbohydrates, like starch. Basically, the process of taking in the nutrient of the food to the body begins by breaking it down to smaller components.
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When RNA polymerase synthesizes a new mRNA, interactions between the RNA polymerase, the DNA, and the RNA hold the complex toget
timurjin [86]

When a hairpin loop forms in the nascent mRNA: The hairpin will destabilize the interaction and possibly lead to  transcriptional termination.

Transcription in prokaryotes like E. coli is terminated either by a rho-dependent process or a rho-independent process. Intrinsic termination is controlled by the specific sequences of RNA .

When the termination process starts, the transcribed mRNA forms a stable secondary structural hairpin loop, also known as a stem-loop. Several uracil nucleotides follow this RNA hairpin. The uracil and adenine connections are exceedingly weak. NusA, a protein attached to RNA polymerase, attaches to the stem-loop structure so firmly that it momentarily stalls the polymerase.

The polymerase is pausing at the same time that the poly-uracil sequence is being transcribed. The RNA-DNA duplex can unwind and separate from the RNA polymerase because the weak adenine-uracil interactions reduce the energy of destabilization for the RNA-DNA duplex. Overall, transcription is terminated by the modified RNA structure.

Learn more about RNA polymerase here :
brainly.com/question/13326597

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