Answer the following question given this paragraph: These brilliant red "feathers" are actually animals called tube worms. They live in an extreme environment on the deep ocean floor, thousands of meters below the water's surface. Their world is always very cold and completely dark. Without sunlight, photosynthesis is not possible. So what do organisms eat at these depths? Tube worms depend on chemosynthetic microorganisms that live inside them for food. In this and other ways, tube worms have adapted to the extreme conditions of their environment. Q: What do tube worms rely on for food? Choices: - fatty microorganisms - lentiviruses microorganisms - sponges microorganisms - chemosynthetic microorganisms A:
chemosynthetic microorganisms
Answer the following question given this paragraph: Positive Feedback Positive feedback intensifies a change in the body's physiological condition rather than reversing it. A deviation from the normal range results in more change, and the system moves farther away from the normal range. Positive feedback in the body is normal only when there is a definite end point. Childbirth and the body's response to blood loss are two examples of positive feedback loops that are normal but are activated only when needed. Childbirth at full term is an example of a situation in which the maintenance of the existing body state is not desired. Enormous changes in the mother's body are required to expel the baby at the end of pregnancy. And the events of childbirth, once begun, must progress rapidly to a conclusion or the life of the mother and the baby are at risk. The extreme muscular work of labor and delivery are the result of a positive feedback system (Figure 1.11). Q: What type of feedback intensifies a change in the body's physiological condition rather than reversing it? Choices: - negative feedback - neutral feedback - susceptible feedback - positive feedback A:
positive feedback
Q: Answer the following question given this paragraph: Forces between Molecules Under appropriate conditions, the attractions between all gas molecules will cause them to form liquids or solids. This is due to intermolecular forces, not intramolecular forces. Intramolecular forces are those within the molecule that keep the molecule together, for example, the bonds between the atoms. Intermolecular forces are the attractions between molecules, which determine many of the physical properties of a substance. Figure 10.5 illustrates these different molecular forces. The strengths of these attractive forces vary widely, though usually the IMFs between small molecules are weak compared to the intramolecular forces that bond atoms together within a molecule. For example, to overcome the IMFs in one mole of liquid HCl and convert it into gaseous HCl requires only about 17 kilojoules. However, to break the covalent bonds between the hydrogen and chlorine atoms in one mole of HCl requires about 25 times more energy430 kilojoules. Q: Under appropriate conditions, the attractions between all molecules in what state will cause them to form liquids or solids? Choices: - soild - plasma - liquid - gas A:
A: gas
Question: Answer the following question given this paragraph: an enzyme (viral neuraminidase) that allows new virions to leave their infected cells. Thus, Tamiflu inhibits the spread of virus from infected to uninfected cells. Other antiviral drugs, such as Ribavirin, have been used to treat a variety of viral infections, although its mechanism of action against certain viruses remains unclear. Q: What effect does tamiflu have on viruses and cells? Choices: - destroys all viruses - reprograms viruses - enhances cells - inhibits spread of virus A:
Answer: inhibits spread of virus
*Question*
Answer the following question given this paragraph: Momentum is a vector that points in the direction of the velocity vector. The magnitude of this vector is the product of mass and speed. Q: The magnitude of the momentum vector is the product of what two properties? Choices: - acceleration and speed - work and speed - volume and speed - mass and speed A:
**Answer**
mass and speed
Answer the following question given this paragraph: Images in a plane mirror are reversed left and right but not reversed top and bottom. Q: Images in what type of mirror are reversed left and right but not reversed top and bottom? Choices: - concave - virtual - convex - plane mirror A:
plane mirror