r Each immunoglobulin molecule has two identical antigen binding sites. b. Because multiple epitopes exist on each antigen, antibodies can form large complexes. c. Because each antibody can bind two antigen molecules at once, antibodies can form large complexes. d. The variable region of a light chain and the variable region of a heavy chain form a binding site of an immunoglobulin. e. All the statements are correct.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

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the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

the correct option is option d

answer: i cant find your answer. do u have another way i can answer it for you : )

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