Answer the following question given this paragraph: Steroids (or sterols) have several functions. Sterols are a subgroup of steroids. The sterol cholesterol is an important part of cell membranes and plays other vital roles in the body. Cholesterol is a precursor to fat-soluble vitamins and steroid hormones. Steroid hormones include the male and female sex hormones. Sterols also have roles as second messengers in signalling pathways. Q: Sterols are a subgroup of what? Choices: - nuclides - nutrients - antibiotics - steroids A:
steroids
Answer the following question given this paragraph: High-density materials are much more effective protection against gamma emissions than low-density ones. Gamma rays are usually blocked effectively by lead shielding. The thickness of the shielding will determine the effectiveness of the protection offered by the lead. Q: What element is typically used to shield things from gamma rays? Choices: - gold - silver - aluminum - lead A:
lead
Q: Answer the following question given this paragraph: Like other catalysts, enzymes are not reactants in the reactions they control. They help the reactants interact but are not used up in the reactions. Instead, they may be used over and over again. Unlike other catalysts, enzymes are usually highly specific for particular chemical reactions. They generally catalyze only one or a few types of reactions. Q: Enzymes are a type of what, and as such, they are not reactants in the reactions they control? Choices: - hormone - metabolite - neurotransmitter - catalyst A:
A: catalyst
Question: Answer the following question given this paragraph: Q: In resting neurons, the plasma membrane has many open potassium channels but few open of which other channels? Choices: - silicon - oxygen - sulfur - sodium A:
Answer: sodium
*Question*
Answer the following question given this paragraph: Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. The types of interactions are reflection, refraction, and diffraction. Each type of interaction is described in detail below. You can see animations of the three types at this URL: http://www. acoustics. salford. ac. uk/schools/teacher/lesson3/flash/whiteboardcomplete. swf . Q: Reflection, refraction, and diffraction are examples of what type of interaction? Choices: - winds - Oscillations - Currents - waves A:
**Answer**
waves
*Question*
Answer the following question given this paragraph: As the example implies, gravitational force is completely negligible on a small scale, where the interactions of individual charged particles are important. On a large scale, such as between the Earth and a person, the reverse is true. Most objects are nearly electrically neutral, and so attractive and repulsive Coulomb forces nearly cancel. Gravitational force on a large scale dominates interactions between large objects because it is always attractive, while Coulomb forces tend to cancel. Q: Gravitational force on a large scale dominates interactions between large objects because it is always what? Choices: - ugly - vulnerable - suitable - attractive A:
**Answer**
attractive