Answer: 550 million years ago according to the internet.
Explanation:
A tRNA isoacceptor is a member of a group of tRNAs with different anticodons but which accept the same amino acid.
An anticodon is a small region on transfer RNA (tRNA) that comprises of three bases which are complementary to a codon in messenger RNA (mRNA). A codon is simply a set of three nucleotide bases.
If a codon in mRNA is GGG, the anticodon on tRNA for this will be CCC. The codon GGG is the code that calls for the amino acid called glycine.
Answer: B
Explanation:
The T helper cell needs to acttivate the T cyctotoxic cell in order for the Tc cell to go do its work.
Once the TC cell is active it interacts with MHC-1 proteins on the surface of the infected host cell, this allows the Tc cell to recignise the host cell and begin secreting cytotoxins (perforins and granzymes) in order to degrade the infected cell and cause apoptosis (controlled cell death)
The scientists that won the Nobel Prize for publishing the first description of the structure of DNA were Watson & Crick.
This would negatively impact the native bird species and the fish population as well as any other underwater species such as smaller fish and algae as they may have overgrowth and could even become an invasive native species over time because the food chain would be disrupted. The native bird species wouldn’t have much food supply and would either die off or migrate to another place, and the feeder schools of fish (large fish) would probably also eventually die off because they would be over dominated with multiple species feeding off of them. The natural food chain already established would be disrupted.
