Which comparison of a phloem companion cell with a B-lymphocyte is correct?
Both cell types have proteins embedded in their cell surface membranes.
2 )
B-lymphocytes have a spherical nucleus but companion cells do not have a nucleus.
3 )
Companion cells always contain chloroplasts, which are not present in B-lymphocytes.
4 )
Neither B-lymphocytes nor companion cells possess plasmodesmata.
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