Answer:
The correct answer is D) short-lived plasma cells that secrete antibodies for the antigen
Explanation:
Each B lymphocyte has an antigen receptor (BCR: B cell receptor), a surface immunoglobulin (IgM or IgD), that binds to specific domains of the antigen called antigenic determinants or epitopes. Only B lymphocytes with a high antibody affinity for the antigen, and which are capable of processing and presenting it, will be positively selected. In this contact between the two cells, an exchange of chemical signals takes place that leads to the activation, clonal proliferation and differentiation of B cells into two sister subclones: one of antibody-secreting plasma cells, and the other of memory primed B cells. Therefore, only these last positively selected B lymphocytes will survive, proliferate and differentiate into plasma cells, synthesizing and secreting antibodies of a single isotypic class, with a unique specificity and high affinity, improving the ability to adhere to the antigen and, thus , neutralize and destroy pathogens.
Bacteria without plasmid will only grow in the media without penicillin since it doesn't have immunity.
Bacteria with recombinant plasmid with VGP gene, n<span>on-recombiant plasmid, Recombinant plasmid but no vgp gene can grow in both media(with or without penicillin) because they can withstand penicillin.</span>
Answer:
The correct answer is option C. "It binds to DNA in a sequence-specific manner".
Explanation:
It is not true that histones bind to DNA in a sequence-specific manner. Histones and DNA have nonspecific bindings (occuring at any DNA sequence) given mostly by electrostatic interactions. DNA is a macromolecule that is highly negatively charged because of its phosphate residues, while histones are proteins that are highly positively charged because of its high content of positively charged amino acids. In consequence, the binding of histones and DNA occurs mostly in a nonspecific fashion given by electrostatic interactions.
Answer:
False.
Explanation:
When a channel protein aids in movement of molecules from high concentration to low concentration, the type of diffusion is called "Facilitated Diffusion". It is not simple diffusion.
Answer:
I beleive the answer is C, hope it helps!✌
Explanation:
