Answer:
C. Antibodies directly destroy antigen-bearing invaders by releasing potent toxins.
Explanation:
An antibody is part of the host cell defense and it’s made by B-cells (white blood cell). The structure of the antibody consists of two light chains and two heavy chains, and at the very tip of the antibody is a hyper variable region, which is the antigen binding site that recognizes lots of different types of antigens. An antigen is anything that is foreign to the human body (the body does not recognize it as self), it can be a virus, bacteria, fungi, some foods and particles like dust that cause allergies and in some cases your own body will appear as foreign.
Antibodies act like small keys looking for the perfect lock, once they find their target they alert the immune system to mount a full immune response. Using this binding mechanism, an antibody can tag a microbe or an infected cell for attack by the immune system or it can neutralize its target directly for example, by blocking a part of a microbe needed for entering and invading a cell. Depending on the antigen the antibody binding may impede the biological process causing the disease or may activate macrophages to destroy the foreign substance, it does not release potent toxins. Antibody binding can cause the clumping (agglutination) of large particles (viruses, bacteria etc.) making it a large complex, making phagocytosis more efficient (as they eliminate lots of clumped up viruses or bacteria in one go, and not one by one).
Answer:
B
Explanation:
Angiosperms are a major division of plant life, which make up the majority of all plants on Earth. ... They quickly gained an advantage over the previously dominant plant type – gymnosperms – for two reasons. Angiosperms' use of flowers to reproduce made them more reproductively successful.
I think you are looking for the word solution, but I'm not 100% sure that's what you mean
Answer:
Small and lipid soluble cortisol can pass through nonpolar core of the plasma membrane.
Explanation:
Cortisol is a lipid-soluble steroid hormone with a compact structure. The plasma membrane is a bilayer of phospholipids.
The phospholipids are amphipathic molecules with a polar head and nonpolar tails. The nonpolar tails of the two layers of phospholipids are packed away from the watery medium and make the core of the plasma membrane.
Being a lipid-soluble hormone with a small structure, cortisol can pass through the nonpolar core of the plasma membrane easily to activate its receptors and alter the gene expression.
