Which statement best describes the relationship between an allele and a gene?
a. an allele is a variation of a gene that can be expressed as a phenotype.
b. an allele is the part of a gene that attaches to messenger rna molecules.
c. an allele is a segment of a dna molecule that controls replication of a gene.
d. an allele is the primary protein made by a gene found in a developing embryo

(i did to know why the wrong answers are wrong.)

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem

Not only is it the purchase of about 40% of america, it also grounds to on-go our advancement as a civilization.