Answer the following question given this paragraph: If an atom gains electrons, it becomes an ion. Is the ion positively or negatively charged? Explain your answer. Q: If an atom gains electrons, it becomes what? Choices: - anion - a cation - neutral - an ion A:
an ion
(Question)
Answer the following question given this paragraph: Bacteria can also be chemotrophs. Chemosynthetic bacteria, or chemotrophs , obtain energy by breaking down chemical compounds in their environment. An example of one of these chemicals broken down by bacteria is nitrogen-containing ammonia. These bacteria are important because they help cycle nitrogen through the environment for other living things to use. Nitrogen cannot be made by living organisms, so it must be continually recycled. Organisms need nitrogen to make organic compounds, such as DNA. Q: Bacteria can be chemotrophs, which obtain what by breaking down chemical compounds in their environment? Choices: - waste - chemials - food - energy A:
(Answer)
energy
Ques: Answer the following question given this paragraph: Most allergies can be treated with medicines. Medicines used to treat allergies include antihistamines and corticosteroids. These medicines help control the immune system when it attacks an allergen. Sometimes, allergies cause severe symptoms, a condition known as anaphylaxis. For example, they may cause the throat to swell so it is hard to breathe. Severe allergies may be life threatening. They require emergency medical care. Q: Prescribed to treat allergies, antihistamines and corticosteroids help control what system that attacks allergens? Choices: - cardiovascular - reproductive system - nervous system - immune system A:
Ans: immune system
(Q).
Answer the following question given this paragraph: Examples of osmosis are evident in many biological systems because cells are surrounded by semipermeable membranes. Carrots and celery that have become limp because they have lost water can be made crisp again by placing them in water. Water moves into the carrot or celery cells by osmosis. A cucumber placed in a concentrated salt solution loses water by osmosis and absorbs some salt to become a pickle. Osmosis can also affect animal cells. Solute concentrations are particularly important when solutions are injected into the body. Solutes in body cell fluids and blood serum give these solutions an osmotic pressure of approximately 7.7 atm. Solutions injected into the body must have the same osmotic pressure as blood serum; that is, they should be isotonic with blood serum. If a less concentrated solution, a hypotonic solution, is injected in sufficient quantity to dilute the blood serum, water from the diluted serum passes into the blood cells by osmosis, causing the cells to expand and rupture. This process is called hemolysis. When a more concentrated solution, a hypertonic solution, is injected, the cells lose water to the more concentrated solution, shrivel, and possibly die in a process called crenation. These effects are illustrated in Figure 11.28. Q: Examples of what process are evident in many biological systems because cells are surrounded by semipermeable membranes? Choices: - reproduction - photosynthesis - apoptosis - osmosis A:
(A).
osmosis
Ques:Answer the following question given this paragraph: Fission is a type of radioactivity in which large nuclei spontaneously break apart into smaller nuclei. Q: Fission is a type of radioactivity in which large nuclei spontaneously break apart into what? Choices: - faster nuclei - light nuclei - active nuclei - smaller nuclei A:

Ans:smaller nuclei
Ques:Answer the following question given this paragraph: Density is a quantity that expresses how much matter is packed into a given space. The amount of matter is its mass, and the space it takes up is its volume. To calculate the density of an object, then, you would use this formula:. Q: What is the term for how much matter is packed into a given space? Choices: - opacity - volume - mass - density A:

Ans:
density