Ques: Q: What is a double membrane of the nucleus that encloses the genetic material? Read this paragraph and choose the correct option from the provided answers: The nuclear envelope is a double membrane of the nucleus that encloses the genetic material. It separates the contents of the nucleus from the cytoplasm. The nuclear envelope is made of two phospholipid bilayers, an inner membrane and an outer membrane. The outer membrane is continuous with the rough endoplasmic reticulum. Many tiny holes called nuclear pores are found in the nuclear envelope. These nuclear pores help to regulate the exchange of materials (such as RNA and proteins) between the nucleus and the cytoplasm. Choices: - the complex envelope - the cell wall - the nuclear compression - the nuclear envelope A:
Ans: the nuclear envelope

Ques: Q: The coordinated activities of the legume and the rhizobium bacteria depend on what between the partners? Read this paragraph and choose the correct option from the provided answers: Choices: - electric signals - sight signals - fertilizer signals - chemical signals A:
Ans: chemical signals

Ques: Q: What is the energy needed to start a reaction between catalysts and reactants called? Read this paragraph and choose the correct option from the provided answers: Catalysts interact with reactants so the reaction can occur by an alternate pathway that has a lower activation energy. Activation energy is the energy needed to start a reaction. When activation energy is lower, more reactant particles have enough energy to react so the reaction goes faster. Many catalysts work like the one in the Figure below . (You can see an animated version at the following URL. ) The catalyst brings the reactants together by temporarily bonding with them. This makes it easier and quicker for the reactants to react together. Notice how the catalyst is released by the product molecule at the end of the reaction. Choices: - reaction energy - decomposition energy - conductivity energy - activation energy A:
Ans: activation energy

Ques: Q: What is the cause of the "heartburn" that occurs when acidic digestive juices escape into the esophagus? Read this paragraph and choose the correct option from the provided answers: sphincter, but the esophagus remains closed when there is no swallowing action. Acid reflux or "heartburn" occurs when the acidic digestive juices escape into the esophagus. Stomach A large part of digestion occurs in the stomach, shown in Figure 34.11. The stomach is a saclike organ that secretes gastric digestive juices. The pH in the stomach is between 1.5 and 2.5. This highly acidic environment is required for the chemical breakdown of food and the extraction of nutrients. When empty, the stomach is a rather small organ; however, it can expand to up to 20 times its resting size when filled with food. This characteristic is particularly useful for animals that need to eat when food is available. Choices: - toxic reflux - acidic buildup - acid pressure - acid reflux A:
Ans:
acid reflux