Fluorine and Nitrogen are both non-metals which posses non polar covalent bonds. So in this case, only KCl has polar covalent bond.
Before solving, let us understand the meaning of covalent and ionic bonds and how to identify them.
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.
Therefore, the polar covalent bond is shown by KCl as it shows sharing of equal electrons amongst them.
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This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:
<h3>Significant figures:</h3>
In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.
In the case of additions, we perform the normal operation as the first step:
1204.2 +4.79613 = 1208.99613
Next, we round the result to the least number of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the only decimal place:
1209.0
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The atomic mass of iodine is 126.90447 u
N-terminal Arg-Lys-Phe C-terminal
The universal codon code is attached for reference. The central dogma (DNA --> RNA--> Proteins) concept is used to translate the information in DNA into proteins.
Explanation:
We shall begin with the transcription of the DNA strand to form an mRNA. Remember that RNA has no Thiamine base but instead in its place is Uracil;
3' GCATTCAAG 5' DNA strand
5’ CGUAAGUUC 3’ RNA strand
We can then begin translating the mRNA into protein using the universal codon code (attached). Remember a codon is a 3 nucleotide sequence that codes for a specific amino acid;
5’ CGUAAGUUC 3’ RNA strand
N-terminal Arg-Lys-Phe C-terminal Peptide strand
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Answer:
A. modern organisms closely resembling fossils
Explanation:
Fossils are defined as the preserved remains or traces of living organisms from past.
Fossils are considered as an evidence for evolution because they represent the existence of life on earth and shows the difference between the life in past that life on earth today. With the help of fossil, it is easy to determine the age of fossils which further help to determine that how modern organisms have evolved from the past.
Hence, the correct answer is "A. modern organisms closely resembling fossils".