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guapka [62]
3 years ago
15

Hairpins often form at palindromic sequences in single strands of either rna or dna. however, several key features differentiate

the helical structure of an rna and a dna hairpin. select the statements that describe the helical structure of an rna hairpin.
Biology
1 answer:
AlekseyPX3 years ago
4 0
Hairpin like structures are formed in both DNA and RNA but are common in RNA than in DNA. This is because DNA can be double stranded or single stranded while RNA is generally single stranded structure that can be double stranded only when it forms a hair pin like structure.
The features of hairpin structure in RNA are as follows:
1. This structure is a building block of many secondary structures of RNA.
2. The termination sequence during transcription also forms a hairpin loop like structure.
3. tRNA also forms a hairpin loop like structure and helps in the process of translation.   
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It decreases the levels of cAMP in the cell, repressing transcription from the lac operon.

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When glucose is absent, cAMP serves as coactivator binds to CRP, the catabolite gene activator protein. The CRP-cAMP complex binds to the site near the lac promoter and stimulates the expression of the operon by RNA polymerase many folds.

Catabolite repression refers to inhibition of the synthesis of enzymes of lactose catabolism when glucose is present as an energy source. In the presence of glucose, synthesis of cAMP is inhibited resulting in its lower cellular concentration. The lower cAMP levels do not allow the binding of cAMP and CRP. The result is reduced expressed of lac operon.

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I believe your Answer would be:

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Hope I helped, if so may I get brainliest and a thanks?

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Explanation:

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