Q: When the hemoglobin loses its oxygen, it changes to what color? Read this paragraph and choose the correct option from the provided answers: The structure of heme (Figure 19.29), the iron-containing complex in hemoglobin, is very similar to that in chlorophyll. In hemoglobin, the red heme complex is bonded to a large protein molecule (globin) by the attachment of the protein to the heme ligand. Oxygen molecules are transported by hemoglobin in the blood by being bound to the iron center. When the hemoglobin loses its oxygen, the color changes to a bluish red. Hemoglobin will only transport oxygen if the iron is Fe2+; oxidation of the iron to Fe3+ prevents oxygen transport. Choices: - purple red - grayish red - light pink - bluish red A:
bluish red
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Q: Memory t cells are long-lived and can even persist for how long? Read this paragraph and choose the correct option from the provided answers: The Cellular Basis of Immunological Memory As already discussed, one of the major features of an adaptive immune response is the development of immunological memory. During a primary adaptive immune response, both memory T cells and effector T cells are generated. Memory T cells are long-lived and can even persist for a lifetime. Memory cells are primed to act rapidly. Thus, any subsequent exposure to the pathogen will elicit a very rapid T cell response. This rapid, secondary adaptive response generates large numbers of effector T cells so fast that the pathogen is often overwhelmed before it can cause any symptoms of disease. This is what is meant by immunity to a disease. The same pattern of primary and secondary immune responses occurs in B cells and the antibody response, as will be discussed later in the chapter. Choices: - eons - days - minutes - lifetime A:
lifetime
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Q: Hydrogen sulfide is a noxious and toxic gas produced from decaying organic matter that contains what? Read this paragraph and choose the correct option from the provided answers: Hydrogen sulfide is a noxious and toxic gas produced from decaying organic matter that contains sulfur. A lethal concentration in rats corresponds to an inhaled dose of 715 molecules per million molecules of air. How many molecules does this correspond to per mole of air? How many moles of hydrogen sulfide does this correspond to per mole of air?. Choices: - tin - methane - helium - sulfur A:
sulfur
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Q: What is a small protein that helps fight infections? Read this paragraph and choose the correct option from the provided answers: Genetically Engineering Bacteria to Produce a Human Protein. Bacteria can be genetically engineered to produce a human protein, such as a cytokine. A cytokine is a small protein that helps fight infections. Choices: - phenotype - zygote - glutamate - cytokine A:
cytokine
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