Q: What consists of a nitrogen atom bonded to some combination of carbons and hydrogens? Read this paragraph and choose the correct option from the provided answers: An amine consists of a nitrogen atom bonded to some combination of carbons and hydrogens. Choices: - an alkali - a metalloid - a chloride - an amine A:
an amine
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Q: What kind of process is boiling? Read this paragraph and choose the correct option from the provided answers: As with melting, the energy in boiling goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. So boiling is also an isothermal process. Only when all of a substance has boiled does any additional energy go to changing its temperature. What happens when a liquid becomes a gas? We have already established that a liquid is composed of particles in contact with each other. When a liquid becomes a gas, the particles separate from each other, with each particle going its own way in space. This is how gases tend to fill their containers. Indeed, in the gas phase most of the volume is empty space; only about 1/1,000th of the volume is actually taken up by matter (Figure 10.4 "Liquids and Gases"). It is this property of gases that explains why they can be compressed, a fact that is considered in Chapter 6 "Gases". Figure 10.4 Liquids and Gases. Choices: - chemical - spheroidal - cavitation - isothermal A:
isothermal
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Q: Cancer involves what changes that modify cell-cycle control and alter the growth rate or progression of the cell through the cell cycle? Read this paragraph and choose the correct option from the provided answers: 16.7 | Cancer and Gene Regulation By the end of this section, you will be able to: Describe how changes to gene expression can cause cancer Explain how changes to gene expression at different levels can disrupt the cell cycle Discuss how understanding regulation of gene expression can lead to better drug design Cancer is not a single disease but includes many different diseases. In cancer cells, mutations modify cell-cycle control and cells don't stop growing as they normally would. Mutations can also alter the growth rate or the progression of the cell through the cell cycle. One example of a gene modification that alters the growth rate is increased phosphorylation of cyclin B, a protein that controls the progression of a cell through the cell cycle and serves as a cell-cycle checkpoint protein. For cells to move through each phase of the cell cycle, the cell must pass through checkpoints. This ensures that the cell has properly completed the step and has not encountered any mutation that will alter its function. Many proteins, including cyclin B, control these checkpoints. The phosphorylation of cyclin B, a post-translational event, alters its function. As a result, cells can progress through the cell cycle unimpeded, even if mutations exist in the cell and its growth should be terminated. This post-translational change of cyclin B prevents it from controlling the cell cycle and contributes to the development of cancer. Choices: - deletions - enhancements - stabilization - mutations A:
mutations
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Q: What are the strongest magnets made? Read this paragraph and choose the correct option from the provided answers: An electromagnet is a solenoid wrapped around a bar of iron or other ferromagnetic material. The magnetic field of the coil magnetizes the bar, which adds to the strength of the magnetic field. Electromagnets are the strongest magnets made. Choices: - permanent magnets - polarized magnets - natural magnets - electromagnets A:
electromagnets
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