The correct answer is option (B) continental drift.
Continental drift is a theory explaining the movement of the earth’s continents over the geological time scale, drifting across the ocean bed. It was proposed by Alfred Wegener in 1912. Similar plants and animal fossils found around the shores of the different continents suggests that these continents were once joined as a single super continent named Pangaea. This Pangaea broke up long ago and the continents moved to their current positions. The ancient fossils of the same species of plants and animals were found on rocks of the same age but on the continents that are now widely separated.
Answer:
Option B. A double-stranded molecule with coded instructions for anorganism's physical characteristics, is the correct statement.
Explanation:
DNA is a genetic material which contains information about the physical features and characteristics of an organism. It is composed of five carbon sugar, phosphate group and nitrogenous base. The DNA base are adenine, cytosine, guanine, and thymine.
Answer:
The acronym mRNA means messenger ribonucleic acid, the nucleic acid responsible for transporting genetic information to the ribosome so that protein synthesis can occur.
Explanation:
Messenger ribonucleic acid or mRNA, is a nucleic acid responsible for containing the genetic code, organizing it into codons —depending on the specific sequence of nitrogenous bases— and taking it to the ribosome for translation and initiation of protein synthesis.
A codon is a sequence of three mRNA nucleotides, each of which encodes a specific amino acid, in addition to:
- <em>Marking the start of protein synthesis, by means of the UAC start codon, which also encodes for amino acid methionine (MET).
</em>
- <em>Indicate the stop of protein synthesis, by means of the STOP codons </em>—<em>UAA, UAG and UGA</em>— <em>which do not code for amino acids.
</em>
This can be seen in the table:
- The first line is the sequence of nitrogenous bases of one of the DNA strands.
- The second line should indicate the sequence of complementary bases of the other DNA strand, which will be transcribed. However, the presence of uracil indicates that it is the mRNA transcribed
- The third line is the sequence of nitrogenous bases in the mRNA strand, organized in triplets or codons.
- The fourth line expresses each of the amino acids and instructions found in the mRNA fragment that was transcribed methionine (start), lysine, tryptophan, proline and STOP (although GUU encodes the amino acid valine and is not a STOP codon).
Variant
Difference in the DNA sequence between two individuals
Genotyping
An analysis that looks at specific locations in DNA to identify variations
