Coding Strand of DNA
When pointing to DNA transcription, the coding strand is found to be the DNA strand whose base sequence is indistinguishable from the base sequence of the RNA transcript developed. It is this strand that comprises the codons, while the non-coding strand comprises the anti-codons.
Nucleotide
Both DNA and RNA are composed of organic molecules known as nucleotides. Hence, nucleotides are known as the basic building blocks of nucleic acids. These substances play a role in various processes such as cell signalling, enzyme reactions, metabolism, and so on.
Structure of Cytosine
Cytosine is among the five primary nitrogenous bases of which DNA and RNA and are being used in storage and transportation of genetic makeup within a cell. Adenine, guanine, thymine as well as uracil are the remaining four nucleobases.
![Using the numbers above the dot structures, click the numbers of the correct dot structures only.
Ex: if only #1 and 2 are correct, click 1 and 2 only.
1
●2
Ca: F:
2
7
6
3
5
1
2
4
3
H
4
5
7
6
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1) Calcium (Ca): Its atomic number is 20 and nearest inert configuration number is 18. So, by losing 2 electrons it can attain stability.
Calcium electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2 and dot structure is Ca when it loses 2 electrons, the calcium ion will be Ca+2. The 2 electrons in dot structure of Ca will be given up in Ca+2 and cation will not have any dots.
So, option 1 is not a right answer
2) Fluorine (F): Its atomic number is 9 and it nearest inert configuration is 10.
It requires one valence electron to reach the inert configuration. It will be surrounded by 7 valence electrons in its elemental state. When it gains one electron then one more electron surrounds the fluorine atom.
The above dot structure is correct for F-.
So, option 2 is right answer
3) Lithium (Li): Its atomic number is 3 and its nearest inert configuration is 2.
It loses one electron to reach the inert configuration and surrounded by one dot electron in elemental state. After losing one electron, Li+ will not be surrounded by any electrons.
So, Option 3 is not correct answer
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