Answer the following question given this paragraph: Radioactive decay involves the emission of a particle and/or energy as one atom changes into another. In most instances, the atom changes its identity to become a new element. There are four different types of emissions that occur. Q: What involves the emission of a particle and/or energy as one atom changes into another? Choices: - spontaneous mutation - atomic transformation - enthalpy - radioactive decay A:
radioactive decay
(Question)
Answer the following question given this paragraph: Density is mass per unit volume. Density is a measure of how closely molecules are packed together. The closer together they are, the greater the density. Since air is a gas, the molecules can pack tightly or spread out. Q: What is the measure of how closely molecules are packed together? Choices: - length - volume - frequency - density A:
(Answer)
density
Ques: Answer the following question given this paragraph: What weighs about three pounds and contains up to 100 billion cells? The answer is the human brain. The brain is the control center of the nervous system. It's like the pilot of a plane. It tells other parts of the nervous system what to do. Q: Which organ is the control center of the nervous system? Choices: - the heart - the spine - the lungs - the brain A:
Ans: the brain
(Q).
Answer the following question given this paragraph: A: A hot water heater increases the temperature of water in most homes. Many hot water heaters burn a fuel such as natural gas. The burning fuel causes the water to get hot because combustion is an exothermic reaction. Q: In a hot water heater, burning fuel causes the water to get hot because combustion is what type of reaction? Choices: - endothermic - geothermal - biochemical - exothermic A:
(A).
exothermic
Ques:Answer the following question given this paragraph: Vesicles are much smaller than vacuoles and have a variety of functions. Some vesicles pinch off from the membranes of the endoplasmic reticulum and Golgi apparatus. These vesicles store and transport proteins and lipids. Other vesicles are used as chambers for biochemical reactions. Q: Are vesicles larger or smaller than vacuoles? Choices: - larger - narrower - wider - smaller A:

Ans:smaller
Answer the following question given this paragraph: A stroke occurs when a blood clot blocks blood flow to part of the brain. Brain cells die quickly when their oxygen supply is cut off. Therefore, a stroke may cause permanent loss of normal mental functions. Many stroke patients suffer some degree of paralysis, or loss of the ability to feel or move certain parts of the body. If medical treatment is given very soon after a stroke occurs, some of the damage may be reversed. Strokes occur mainly in older adults. Q: What medical emergency occurs when a blood clot blocks blood flow to part of the brain, causing death of brain cells? Choices: - cardiac arrest - epileptic seizure - heart murmur - stroke A:
stroke