Answer the following question given this paragraph: Q: Brown algae are important commodities for what? Choices: - reptiles - fish - parasites - humans A:
humans
Answer the following question given this paragraph: 10.9 Development and Regeneration of Muscle Tissue Muscle tissue arises from embryonic mesoderm. Somites give rise to myoblasts and fuse to form a myotube. The nucleus of each contributing myoblast remains intact in the mature skeletal muscle cell, resulting in a mature, multinucleate cell. Satellite cells help to repair skeletal muscle cells. Smooth muscle tissue can regenerate from stem cells called pericytes, whereas dead cardiac muscle tissue is replaced by scar tissue. Aging causes muscle mass to decrease and be replaced by noncontractile connective tissue and adipose tissue. Q: While smooth muscle tissue can regenerate from stem cells called pericytes, dead cardiac muscle tissue is replaced by what type of tissue? Choices: - Maximum - embryo tissue - neon tissue - scar tissue A:
scar tissue
Q: Answer the following question given this paragraph: Substances can change phaseoften because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous. The process of a solid becoming a liquid is called melting (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occursknown as the melting pointis a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called theenthalpy of fusion (or heat of fusion) of the substance, represented as Hfus. Some Hfus values are listed in Table 10.2 "Enthalpies of Fusion for Various Substances"; it is assumed that these values are for the melting point of the substance. Note that the unit of Hfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The Hfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so H will be positive), while solidification is always exothermic (so H will be negative). Table 10.2 Enthalpies of Fusion for Various Substances Substance (Melting Point). Q: What do you call the process of a solid becoming a liquid? Choices: - boiling - vaporizing - freezing - melting A:
A: melting
Question: Answer the following question given this paragraph: Matter can exist in one of several different states, including a gas, liquid, or solid state. States of matter differ in the amount of energy their molecules have. When matter recycles, it changes state by gaining or losing energy. Q: When matter recycles and changes state what does it gain or lose by doing so? Choices: - density - volume - fuel - energy A:
Answer: energy
*Question*
Answer the following question given this paragraph: The name of this molecule is 2-methylpropane. The molecular formula is still C 4 H 10 , which is the same formula as butane. A structural isomer is one of multiple molecules that have the same molecular formula, but different structural formulas. Butane and 2-methylpropane are structural isomers. Q: The molecular formula is still c 4 h 10 , which is the same formula as? Choices: - chlorine - carbon hydroxide - propane - butane A:
**Answer**
butane
(Question)
Answer the following question given this paragraph: Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemical compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids. ) Proteins contain carbon, hydrogen, oxygen, nitrogen, and sulfur. Protein molecules consist of one or more chains of small molecules called amino acids. Q: How many classes of biochemical compounds are there? Choices: - one - five - three - four A:
(Answer)
four