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mario62 [17]
2 years ago
10

An antigen _____. a) is a protein molecule that helps defend the body against disease

Biology
1 answer:
ASHA 777 [7]2 years ago
7 0

Answer: Option B) is a foreign molecule that evokes a specific response by a lymphocyte

Explanation:

An antigen is a large, foreign molecule (such as a protein) that stimulates the host organism to secrete lymphocytes and specific antibodies that bind to the foreign molecule, labelling it as foreign and destined for destruction.

Thus, option B is the answer

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Sickle cell disease is caused by a:
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Which of the following sequences shows a frameshift mutation compared to the wild-type mRNA sequence?
Butoxors [25]

Option C:

B. wild-type 5-AUGCAUACAUUGGAGUGA-3 mutant 5'-AUGCAUACAUCUGGAGUGA- 3' 

Explanation:

A frameshift mutation is a genetic mutation such that the triplet nature of gene expression by codons, the insertion or deletion occurs in such as way that it alters the complete sequence of 3 codon sets and can change the reading frame, resulting in a completely different translation from the original.

As it is pertinent to understanding that all genes are normally translated in sets of 3 codons, which typically describes and explain a unique amino acid sequence. Thus, if a frame shift mutation occurs, it can affect many amino acid sequences and finally the entire protein.  

If we look at option B:

wild-type 5-AUG   CAU  ACA  UUG  GAG  UGA-3  

mutant 5’-    AUG   CAU  ACA  UCU  GGA  GUG  A-3’  

An insertion of a base Uracil showed at the end of 3rd codon which affected and altered the whole sequence of codon triplets. This changed all next codons and finally all next amino acids will be altered.

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