Which of the following best describes an antibody?

1. Protane the targets and blocks and molecules
2. A molecule that causes the body to react negatively to certain substances
3. A tiny invader, like a virus,
bacterium or parasite
4. A molecule that provides energy to the body

Antibody (Ab) also known as immunoglobulin (Ig) is a large Y shaped protein produced by plasma cells. They are used by the body's immune system to neutralize pathogens like harmful bacteria and viruses.

They are secreted by the B cells of the adaptive immune system mostly by differentiated B cells called plasma cells. They are glycoproteins.

Which of the following best describes an antibody? 1. Protane the targets and blocks and molecules 2. A molecule that causes the body to react negatively to certain substances 3. A tiny invader, like a virus, bacterium or parasite 4. A molecule that provides energy to the body

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Which of the following best describes an antibody?

1. Protane the targets and blocks and molecules
2. A molecule that causes the body to react negatively to certain substances
3. A tiny invader, like a virus,
bacterium or parasite
4. A molecule that provides energy to the body