<span>The molecules that provoke a specific immune response are called antigens.
</span>This molecule initiates the production of an antibody and causes an immune response. T<span>oxins, chemicals, bacteria, viruses, or other substances that come from outside the body can be part of the antigens.
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Answer:
its like a quadrant.
Explanation:q4 ,same thing but negative.
This means that a single carbon atom can form up to tetravalent bonds with other atoms
Answer:
B) Nucleotides
Explanation:
The nucleotides sequence of DNA molecules determines the protein that will be produced. The mRNA molecules carry a copy of DNA to ribosome. the nucleotides consist of three parts- nitrogenous base, pentose sugar and a phospate group. There have more than six billion nucleotide pairs in a cell.
