Answer the following question given this paragraph: The exothermic reaction on the left releases energy. The endothermic reaction on the right consumes energy. Q: What do you call a reaction that consumes energy as it is carried out? Choices: - autotrophic - exothermic - unstable - endothermic A:
endothermic
(Question)
Answer the following question given this paragraph: There are several types of pathogens that cause diseases in human beings. They include bacteria, viruses, fungi, and protozoa. The different types are described in Table below . The table also lists several diseases caused by each type of pathogen. Many infectious diseases caused by these pathogens can be cured with medicines. For example, antibiotic drugs can cure most diseases caused by bacteria. Q: Bacteria, viruses, fungi, and protozoa are examples of what, the term for a disease-causing microorganism? Choices: - fungus - microbe - germ - pathogen A:
(Answer)
pathogen
Ques: Answer the following question given this paragraph: The temperature dependence of solubility can be exploited to prepare supersaturated solutions of certain compounds. A solution may be saturated with the compound at an elevated temperature (where the solute is more soluble) and subsequently cooled to a lower temperature without precipitating the solute. The resultant solution contains solute at a concentration greater than its equilibrium solubility at the lower temperature (i. , it is supersaturated) and is relatively stable. Precipitation of the excess solute can be initiated by adding a seed crystal (see the video in the Link to Learning earlier in this module) or by mechanically agitating the solution. Some hand warmers, such as the one pictured in Figure 11.18, take advantage of this behavior. Q: The temperature dependence of solubility can be exploited to prepare what solutions of certain compounds? Choices: - mineralized - isolated - instantiated - supersaturated A:
Ans: supersaturated
(Q).
Answer the following question given this paragraph: Q: Young eutherians complete their embryonic development within what? Choices: - pollen grains - ovaries - spores - uterus A:
(A).
uterus
Ques:Answer the following question given this paragraph: Using Prokaryotes to Clean up Our Planet: Bioremediation Microbial bioremediation is the use of prokaryotes (or microbial metabolism) to remove pollutants. Bioremediation has been used to remove agricultural chemicals (pesticides and fertilizers) that leach from soil into groundwater. Certain toxic metals, such as selenium and arsenic compounds, can also be removed from water by bioremediation. The reduction of SeO 24 to SeO 23 and to Se0 (metallic selenium) is a method used to remove selenium ions from water. Mercury is an example of a toxic metal that can be removed from an environment by bioremediation. Mercury is an active ingredient of some pesticides; it is used in industry and is also a byproduct of certain industries, such as battery production. Mercury is usually present in very low concentrations in natural environments but it is highly toxic because it accumulates in living tissues. Several species of bacteria can carry out the biotransformation of toxic mercury into nontoxic forms. These bacteria, such as Pseudomonas aeruginosa, can convert Hg2+ to Hg0, which is nontoxic to humans. Probably one of the most useful and interesting examples of the use of prokaryotes for bioremediation purposes is the cleanup of oil spills. The importance of prokaryotes to petroleum bioremediation has been demonstrated in several oil spills in recent years, such as the Exxon Valdez spill in Alaska (1989) (Figure 13.10), the Prestige oil spill in Spain (2002), the spill into the Mediterranean from a Lebanon power plant (2006,) and more recently, the BP oil spill in the Gulf of Mexico (2010). To clean up these spills, bioremediation is promoted by adding inorganic nutrients that help bacteria already present in the environment to grow. Hydrocarbon-degrading bacteria feed on the hydrocarbons in the oil droplet, breaking them into inorganic compounds. Some species, such as Alcanivorax borkumensis, produce surfactants that solubilize the oil, while other bacteria degrade the oil into carbon dioxide. In the case of oil... Q: Use of oil-consuming bacteria to clean up an oil spill is an example of what? Choices: - generation - coagulation - biodegradation - bioremediation A:

Ans:bioremediation
Answer the following question given this paragraph: The frequency of a wave is the same as the frequency of the vibrations that caused the wave. For example, to generate a higher-frequency wave in a rope, you must move the rope up and down more quickly. This takes more energy, so a higher-frequency wave has more energy than a lower-frequency wave with the same amplitude. You can see examples of different frequencies in the Figure below (Amplitude is the distance that particles of the medium move when the energy of a wave passes through them. ). Q: What is the ratio of a wave frequency to its vibration frequency? Choices: - one - two - three - same A:
same