As the star collapses, fusion occurs in the core of the star. This process compacts atoms and if the star is sufficiently massive, stellar nucleosynthesis takes place and heavier elements are formed. If nuclear fusion is unable to prevent gravitational collapse, the star will blow itself apart as a supernova, ejecting the heavier elements into space at very high speed. So space is seeded with heavier elements, to be captured by the gravitational attraction of other celestial bodies and absorbed into solar systems.
Answer:
1=hydroxyl of phosphate
2=hydroxyl
Explanation:
Nucleic acid is the condensation polymer of nucleotide. Nucleotides are link together through ester bond. The hydroxyl group of phosphate on one nucleotide goes to condensation reaction with the hydroxyl group of another nucleotide. This is chain process, a large molecule of nucleic acid is formed. It is also called polynucleotide.
RNA and DNA are formed by the nucleic acid. The building block of nucleic acid made up of three chemicals.
- Pentose sugar
- Base
- Phosphate
Pentose sugar:
The sugars present in DNA and RNA is pentose. In DNA this sugar is deoxyribose while in case of RNA this is ribose sugar. The hydroxyl groups are present on these sugars. Ribose consist of four hydroxyl group while deoxyribose consist of three hyrdroxyl group. These react with phosphoric acid and carboxylic acid and form ester.
Base:
RNA and DNA are consist of four bases:
DNA= Adenine, guanine, thymine, cytosine
RNA= Adenine, guanine, uracil, cytosine
Phosphate:
The inorganic acid H3PO4 is present. The hydroxyl group present on it undergoes the reaction with amines and alcohol to form amide and ester respectively.
Electrons move about the nucleus in defined orbits.
Explanation:
The Bohr mode of the atom was established based on the quantum mechanics originally developed by Planck.
- He suggested that the extranuclear part of the atom consists of electrons in specific spherical orbits around the nucleus. The orbits represents the principal energy levels.
The quantum theory was developed originally by Planck.
- He suggested energy exists in form of packets and discrete amount and not in form of flow like waves.
The quantum theory and Bohr mode in this regard as they both agree that electrons and energy are both quantized.
Learn more:
Bohr model brainly.com/question/4986277
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Answer:
Explanation:
Hello.
In this case, the relationship between wavelength, speed of light and frequency is:
It means that solving for the frequency, we obtain:
Thus, for the given 720-nm wavelength and the speed of light, the frequency is:
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