The answer is <span>Polonium-218 (84 protons).
Alpha particles consist of two protons and two neutrons. So, mass is 4 (2+2) amu </span><span>.
</span><span>When an atom of emits an alpha particle, its atomic number will be reduced by 2 and a mass number will be reduced by 4:
</span> → + .<span>
After emission of the alpha particle from Radon-222 with 86 protons, the daughter product will have the atomic number reduced by 2: 86-2 = 84 and the mass number reduced by 4: 222-4=218:
</span> → + .
Answer: Sea stars move using a water vascular system. Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals.
Explanation: The radial canals carry water to the ampullae and provide suction to the tube feet.
The correct answer is: silent mutation
There are a few types of genetic mutation that can change genetic code. Those mutations can be classified:
1. Substitution-only one base is changed
• Nonsense mutations-when substitution leads to the formation of a stop codon instead of a codon
• Missense mutations-when one nucleotide is substituted and a different codon is formed
• Silent mutations-when a nucleotide is substituted and the same amino acid is produced
2. Insertion- extra base pairs are inserted
3. Deletion- section of DNA is deleted
Gastrointestinal epithelial cells. The epithelial cells that
like the gastrointestinal tract are typically HIGHLY PROLIFERATIVE. Cells that
line gastrointestinal tract. Cells proliferate and produce plasma cells. The
plasma cells bear antibodies with the identical antigen specificity as the
antigen receptors of the activated B cells.
