Question: *Question*
Answer the following question given this paragraph:      Q: What isotope of carbon is typically used to date ancient items?   Choices:  - uranium 14  - nitrogen 14  - carbon 12  - carbon 14  A:
**Answer**
carbon 14

*Question*
Answer the following question given this paragraph:   Introduction Each somatic cell in the body generally contains the same DNA. A few exceptions include red blood cells, which contain no DNA in their mature state, and some immune system cells that rearrange their DNA while producing antibodies. In general, however, the genes that determine whether you have green eyes, brown hair, and how fast you metabolize food are the same in the cells in your eyes and your liver, even though these organs function quite differently. If each cell has the same DNA, how is it that cells or organs are different? Why do cells in the eye differ so dramatically from cells in the liver? Whereas each cell shares the same genome and DNA sequence, each cell does not turn on, or express, the same set of genes. Each cell type needs a different set of proteins to perform its function. Therefore, only a small subset of proteins is expressed in a cell. For the proteins to be expressed, the DNA must be transcribed into RNA and the RNA must be translated into protein. In a given cell type, not all genes encoded in the DNA are transcribed into RNA or translated into protein because specific cells in our body have specific functions. Specialized proteins that make up the eye (iris, lens, and cornea) are only expressed in the eye, whereas the specialized proteins in the heart (pacemaker cells, heart muscle, and valves) are only expressed in the heart. At any given time, only a subset of all of the genes encoded by our DNA are expressed and translated into proteins. The expression of specific genes is a highly regulated process with many levels and stages of control. This complexity ensures the proper expression in the proper cell at the proper time.   Q: Whereas each cell shares the same genome and dna sequence, each cell does not turn on, or express, the same set of what?   Choices:  - babies  - eggs  - balls  - genes  A:
**Answer**
genes

*Question*
Answer the following question given this paragraph:   Sedimentary rocks form when sediments are compacted and cemented together. Sediments are pieces of rock. They may be gravel, sand, silt, or clay. Some sedimentary rocks form the solid minerals left behind after a liquid evaporates.   Q: What type of rocks form when sediments are compacted and cemented together?   Choices:  - metamorphic rocks  - crystalline rocks  - igneous rocks  - sedimentary rocks  A:
**Answer**
sedimentary rocks

*Question*
Answer the following question given this paragraph:   Internal Energy U We can think about the internal energy of a system in two different but consistent ways. The first is the atomic and molecular view, which examines the system on the atomic and molecular scale. The internal energy U of a system is the sum of the kinetic and potential energies of its atoms and molecules. Recall that kinetic plus potential energy is called mechanical energy. Thus internal energy is the sum of atomic and molecular mechanical energy. Because it is impossible to keep track of all individual atoms and molecules, we must deal with averages and distributions. A second way to view the internal energy of a system is in terms of its macroscopic characteristics, which are very similar to atomic and molecular average values. Macroscopically, we define the change in internal energy.   Q: What type of energy of a system is the sum of the kinetic and potential energies of its atoms and molecules?   Choices:  - external energy u  - primary energy u  - deep energy u  - internal energy u  A:
**Answer**

Answer: internal energy u