Plasma cells .

a. are large so that they can envelope their prey by phagocytosis
b. have a great deal of rough endoplasmic reticulum to dispose of ingested pathogens
c. are small so that they slip between endothelial cells of capillaries to fight infection in the surrounding tissues
d. have a great deal of rough endoplasmic reticulum reflecting the fact that they secrete a tremendous amount of protein (antibody)

d. have a great deal of rough endoplasmic reticulum reflecting the fact that they secrete a tremendous amount of protein (antibody)

Explanation:

Plasma cells are lymphocytes which originates from the bone marrow. They are B cells and not usually found in blood circulation. They tend to remain in organs of their choice.

Plasma cells mechanism of operation is by producing enough antibodies to fight against antigens it encounters in the bloodstream.

These antibodies are rich in protein which makes the plasma cells rich in rough endosplasmic reticulum. The rough endosplasmic reticulum is responsible for protein synthesis in cells.

This explanation validated the option D.

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.