immunity occurs when the person is exposed to a pathogen, develops the disease, and becomes immune as a result of the immune response. immunity can be induced by any substance that contains the antigen that is purposefully introduced into the body. For example, a vaccine stimulates a primary response against the antigen without causing symptoms of the disease. immunity is a short-term immunization due to the injection of that are not produced by the recipient's immune system. immunity occurs in the fetus during pregnancy, as certain antibodies are passed from the maternal blood into the fetal bloodstream.

Naturally acquired active, Live, primary, Artificially acquired active, Artificially acquired passive, Antibodies, Naturally acquired passive

Explanation:

Immunity refers to the state of being resistant to infection or reinfection with a pathogen

It can be passive or active immunity.

Active immunity can be Naturally acquired active immunity when a person is exposed to live pathogens,manifests the disease and due to primary immune response they become immune. Artificially acquired active immunity is through vaccination.

Passive immunity can be Naturally acquires passive immunity where a fetus gets some antibodies from maternal blood stream and becomes immune to certain pathogens. Whereas Artificially acquired passive immunity is when an individual is injected with antibodies such as gamma globulin.

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step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.