Ques:Q: What protein is produced when a plasma cell is stimulated by antigens? Read this paragraph and choose the correct option from the provided answers: 42.3 | Antibodies By the end of this section, you will be able to: Explain cross-reactivity Describe the structure and function of antibodies Discuss antibody production An antibody, also known as an immunoglobulin (Ig), is a protein that is produced by plasma cells after stimulation by an antigen. Antibodies are the functional basis of humoral immunity. Antibodies occur in the blood, in gastric and mucus secretions, and in breast milk. Antibodies in these bodily fluids can bind pathogens and mark them for destruction by phagocytes before they can infect cells. Choices: - collagen - dystrophin - keratin - immunoglobulin A:

Ans:immunoglobulin
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Ques:Q: What often involves the loss of hydrogen, the gain of oxygen, or the loss of electrons? Read this paragraph and choose the correct option from the provided answers: Oxidation often involves the loss of hydrogen, the gain of oxygen, or the loss of electrons. Choices: - decomposition - precipitation - carbonation - oxidation A:

Ans:oxidation
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Ques:Q: What phylum includes snails, squids and clams? Read this paragraph and choose the correct option from the provided answers: Mollusks are mainly aquatic invertebrates in Phylum Mollusca. They include snails, squids, and clams. Mollusks have a coelom and several organ systems. Most also have a shell, head, foot, and radula, which is a feeding organ. Mollusks are either free-living heterotrophs or parasites. Choices: - protozoa - cnidaria - porifera - mollusca A:

Ans:mollusca
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Ques:Q: What is the name of the layer above the mesosphere? Read this paragraph and choose the correct option from the provided answers: The thermosphere is the layer above the mesosphere. It rises to 600 kilometers (372 miles) above the surface. The International Space Station and other space stations orbit Earth in this layer. Choices: - exosphere - lithosphere - intersphere - thermosphere A:

Ans:
thermosphere
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