Question: Answer the following question given this paragraph: The reaction is exothermic and thus the sign of the enthalpy change is negative. Q: What enthalpy change is observed in an exothermic reaction? A:
OPTIONS:
- positive
- no change
- entropy
- negative
Answer: negative

input with options: Answer the following question given this paragraph: Figure below shows how phospholipid molecules are arranged in a cell membrane. One end (the head) of each phospholipid molecule is polar and attracts water. This end is called hydrophilic ("water loving"). The other end (the tail) is nonpolar and repels water. This end is called hydrophobic ("water hating"). The nonpolar tails are on the inside of the membrane. The polar heads are on the outside of the membrane. These differences in polarity allow some molecules to pass through the membrane while keeping others out. You can see how this works in the video at the URL below. Q: The end of the phospholipid molecule that is polar and attracts water is called what? A:
OPTIONS:
- cytosolic
- hydrophobic
- magnetic
- hydrophilic
output: hydrophilic

Q: Answer the following question given this paragraph: Bacteria in food or water usually can be killed by heating it to a high temperature. Generally, this temperature is at least 71 C (160 F). Bacteria on surfaces such as countertops and floors can be killed with disinfectants, such as chlorine bleach. Bacterial infections in people can be treated with antibiotic drugs . These drugs kill bacteria and may quickly cure the disease. If you've ever had strep throat, you were probably prescribed an antibiotic to treat it. Q: What helps treat bacterial infections in people? A:

OPTIONS:
- respiratory drugs
- vaccines
- rest
- antibiotic drugs

A: antibiotic drugs

input: OPTIONS:
- biomes
- spontaneous mutation
- food chains
- ecological pyramids Now, answer this question: Answer the following question given this paragraph: Ecological pyramids can demonstrate the decrease in energy, biomass or numbers within an ecosystem. Energy pyramids are discussed at http://www. youtube. com/watch?v=8T2nEMzk6_E (1:44). Q: What can demonstrate the decrease in energy, biomass or numbers within an ecosystem? A:
A:
output: ecological pyramids

Answer the following question given this paragraph: Lymphocytes: B Cells, T Cells, Plasma Cells, and Natural Killer Cells As stated above, lymphocytes are the primary cells of adaptive immune responses (Table 21.1). The two basic types of lymphocytes, B cells and T cells, are identical morphologically with a large central nucleus surrounded by a thin layer of cytoplasm. They are distinguished from each other by their surface protein markers as well as by the molecules they secrete. While B cells mature in red bone marrow and T cells mature in the thymus, they both initially develop from bone marrow. T cells migrate from bone marrow to the thymus gland where they further mature. B cells and T cells are found in many parts of the body, circulating in the bloodstream and lymph, and residing in secondary lymphoid organs, including the spleen and lymph nodes, which will be described later in this section. The human body contains approximately 10 12 lymphocytes. Q: What are the primary cells of adaptive immune response? A:

OPTIONS:
- erythrocytes
- red blood cells
- white blood cells
- lymphocytes

Answer: lymphocytes

Q: Answer the following question given this paragraph: Organs of excretion make up the excretory system. They include the kidneys, large intestine, liver, skin, and lungs. Q: Kidneys, large intestine, liver, skin, and lungs comprise which system? A:

OPTIONS:
- Muscular system
- Digestive system
- Lymphatic system
- excretory system

A:
excretory system