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.
D. metamorphic -> melting -> igneous -> erosion
Explanation:
The sequence that would be the best possible for a rock going through the rock cycle is metamorphic rocks melting to produce igneous rocks that are eroded.
- The rock cycle shows the pathway by which different rock types are formed.
- The origin of the formation of rocks starts with the production of magma.
- Igneous rocks are formed from cooling and solidification of molten magma.
- Metamorphic rocks are formed from the subjection of igneous and sedimentary rocks to high temperature and pressure.
- Sedimentary rocks are formed from weathering, erosion, transportation and deposition of rocks.
- Option D shows a metamorphic rock melting to give igneous rocks and the igneous rock is eventually eroded to form sedimentary rocks.
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A - Endoplasmic Reticulum.
It decreases the deviation.
<span>Probability principles: The probability of a head/tail occuring stabilies to 0.5 in the long run.</span>