Answer:
The correct answer would be nonsence mutation.
It is a type of point mutation in which an amino acid coding codon is converted into a stop codon.
It results in the termination of a premature polypeptide chain.
For example, the mutation of codon third GCT into ACT in which guanine is replaced with adenine.
DNA template strand 3' - TAC TGA GCT GTG GCT CGC TCG ACT - 5'
mRNA sequence 5' - AUG ACU CGA CAC CGA GCG AGC UGA- 3'
Amino acid sequence Met Thr Arg His Arg Ala Ser Stop
Mutated DNA template strand 3'-TAC TGA ACT GTG GCT CGC TCG ACT -5'
mRNA sequence 5'- AUG ACU UGA CAC CGA GCG AGC UGA-3'
Amino acid sequence Met Thr Stop
The type of mutation that always creates a stop codon is a nonsense mutation.
Nonsense mutations are point mutations that result in the conversion of a codon that encodes an amino acid into a premature stop codon. A stop codon is a specific sequence of three nucleotides (either UAA, UAG, or UGA) that signals the termination of protein synthesis during translation.
When a nonsense mutation occurs, it leads to the premature termination of the protein synthesis process, as the ribosome encounters the stop codon and stops the translation prematurely. As a result, the protein synthesized from the mutated gene is truncated and typically nonfunctional.
Nonsense mutations can arise from various genetic alterations, such as single nucleotide substitutions, insertions, or deletions. The resulting premature stop codon can lead to the production of a truncated protein or the degradation of the mRNA molecule through a process called nonsense-mediated mRNA decay (NMD).
To learn more about nonsense mutation , here
#SPJ6
primary succession
B)
secondary succession
C)
trophic metamorphosis
D)
ecological infiltration
b. The RNA transcript is complimentary to the DNA from which it is transcribed. Instead of thymine, it has uracil, which complements the adenine of DNA.
c. The RNA transcript is an exact replica of the DNA from which it is transcribed. Instead of adenine, it has uracil, which complements the thymine of DNA.
Answer: The correct answer is -
b. The RNA transcript is complimentary to the DNA from which it is transcribed. Instead of thymine, it has uracil, which complements the adenine of DNA.
Explanation:
Transcription is a process of formation of mRNA (messenger RNA) from DNA. During this process, RNA polymerase enzyme uses the template DNA strand and adds the nucleotides (in mRNA in the 5' to 3' direction) complimentary to this. It adds uracil in the mRNA transcript for adenine in rhe DNA template. Similarly, for guanine in the DNA, cytosine is added.
Thus, option b) is the right answer.
B. Protein
C. Vitamin D
D. Biotin
Answer: The correct answer to the question is option C
VITAMIN D
Explanation: Vitamin D is one of the essential vitamins needed by the body,it is fat soluble and plays a vital role in increasing the rate the body( intestines) absorbs calcium,phosphate and magnesium.
Vitamin D is very important for everybody but plays a crucial role in the health of the elderly (older adults) especially their bone health.
Vitamin D helps in the absorption of Calcium in the body and calcium helps in the strengthening of bones of the body.
Vitamin D is very vital in the maintainance of bone strength as well as act as a form of hormone that helps in the regulation of the growth and development of other tissues in the body.
When Vitamin D is deficient in the body especially older adults,it will lead to muscle weakness, possible bone deformity,bone pain which are all as a result of the loss of bone tissues.