Answer the following question given this paragraph: Red blood cells ( Figure below ) are made in the red marrow of long bones, rib bones, the skull, and vertebrae. Each red blood cell lives for only 120 days (about four months). After this time, they are destroyed in the liver and spleen. Mature red blood cells do not have a nucleus or other organelles. Lacking these components allows the cells to have more hemoglobin and carry more oxygen. Q: Red blood cells don't have a nucleus. this allows them to do what? Choices: - be redder - move faster - heal faster - carry more oxygen A:
carry more oxygen
Answer the following question given this paragraph: The mass number is defined as the total number of protons and neutrons in an atom. Q: The total number of protons and neutorns in an atom is called what? Choices: - atom number - volume number - formation number - mass number A:
mass number
Q: Answer the following question given this paragraph: Both fluorine and lithium are highly reactive elements because of their number of valence electrons. Fluorine will readily gain one electron and lithium will just as readily give up one electron to become more stable. In fact, lithium and fluorine will react together as shown in the Figure below . When the two elements react, lithium transfers its one "extra" electron to fluorine. Q: Both fluorine and lithium are highly reactive elements because of their number of what? Choices: - shell electrons - positrons - covalence electrons - valence electrons A:
A: valence electrons
Question: Answer the following question given this paragraph: All objects in the universe have an attraction to each other. This attraction is known as gravity ( Figure below ). The strength of the force of gravity depends on two things. One is the mass of the objects. The other is the distance between the objects. As an object's mass increases, the attraction increases. As the distance between the objects increases, the attraction decreases. Q: The attraction between all objects in the universe is known as ______. Choices: - variation - electricity - magnetism - gravity A:
Answer: gravity
*Question*
Answer the following question given this paragraph: Transport vesicles are part of the endomembrane system. They are able to move molecules such as proteins between locations inside the cell. For example, transport vesicles move proteins from the rough endoplasmic reticulum to the Golgi apparatus. Q: Transport vesicles move what type of molecules from the rough endoplasmic reticulum to the golgi apparatus? Choices: - acids - lipids - hormones - proteins A:
**Answer**
proteins
Q: Answer the following question given this paragraph: Hypersensitivities Maladaptive immune responses toward harmless foreign substances or self antigens that occur after tissue sensitization are termed hypersensitivities. The types of hypersensitivities include immediate, delayed, and autoimmunity. A large proportion of the population is affected by one or more types of hypersensitivity. Allergies The immune reaction that results from immediate hypersensitivities in which an antibody-mediated immune response occurs within minutes of exposure to a harmless antigen is called an allergy. In the United States, 20 percent of the population exhibits symptoms of allergy or asthma, whereas 55 percent test positive against one or more allergens. Upon initial exposure to a potential allergen, an allergic individual synthesizes antibodies of the IgE class via the typical process of APCs presenting processed antigen to TH cells that stimulate B cells to produce IgE. This class of antibodies also mediates the immune response to parasitic worms. The constant domain of the IgE molecules interact with mast cells embedded in connective tissues. This process primes, or sensitizes, the tissue. Upon subsequent exposure to the same allergen, IgE molecules on mast cells bind the antigen via their variable domains and stimulate the mast cell to release the modified amino acids histamine and serotonin; these chemical mediators then recruit eosinophils which mediate allergic responses. Figure 42.26 shows an example of an allergic response to ragweed pollen. The effects of an allergic reaction range from mild. Q: Hypersensitivity may refer to a maladaptive response of what system toward a harmless foreign substance? Choices: - oxygen - brain - System - immune A:
A: immune