Antibodies have a variable region that binds to a specific antigenic determinant.
Antibody
An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein used by the immune system to identify and neutralize foreign objects such as pathogenic bacteria and viruses. The antibody recognizes a unique molecule of the pathogen, called an antigen. Each tip of the "Y" of an antibody contains a paratope (analogous to a lock) that is specific for one particular epitope (analogous to a key) on an antigen, allowing these two structures to bind together with precision. Using this binding mechanism, an antibody can tag a microbe or an infected cell for attack by other parts of the immune system or can neutralize it directly (for example, by blocking a part of a virus that is essential for its invasion).
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The process that results in Ms. Milly’s wilting lettuce becoming firm is osmosis. The explanation is below.
OSMOSIS:
- Osmosis is the process by which water molecules move from a region of high concentration to a region of low concentration via a semipermeable membrane.
- According to this question, Ms. Milly, occasionally sprinkles water on her wilting lettuce and notices that they became firm.
- The firmness of the lettuce is as a result of the movement of water into the leaf cells due to a process called osmosis.
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the answer is B :) youre welcome