BIOLOGY
NUCLEIC ACIDS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
This forms hydrogen bonds with mRNA in the ribosome
|
|
|
This codes for methionine
|
|
|
UAG, UAA, and UGA are the only 3 types of these, 3 of these exist in the genetic code, A nonsense mutation creates a premature one of these, This ends translation, This does not code for an amino acid
|
|
|
None of the above
|
Detailed explanation-1: -Definition. A stop codon is a sequence of three nucleotides (a trinucleotide) in DNA or messenger RNA (mRNA) that signals a halt to protein synthesis in the cell. There are 64 different trinucleotide codons: 61 specify amino acids and 3 are stop codons (i.e., UAA, UAG and UGA).
Detailed explanation-2: -There are 3 STOP codons in the genetic code-UAG, UAA, and UGA. These codons signal the end of the polypeptide chain during translation. These codons are also known as nonsense codons or termination codons as they do not code for an amino acid.
Detailed explanation-3: -UAA, UAG and UGA are the stop codons, and do not code for amino acids. They are also known as termination codons or nonsense codons, and act as signals on the mRNA to stop protein synthesis.
Detailed explanation-4: -The codons UAA, UAG, and UGA are the stop codons that signal the termination of translation. Figure 2 shows the 64 codon combinations and the amino acids or stop signals they specify.
Detailed explanation-5: -… A nonsense mutation, or its synonym, a stop mutation, is a change in DNA that causes a protein to terminate or end its translation earlier than expected. This is a common form of mutation in humans and in other animals that causes a shortened or nonfunctional protein to be expressed.