user: Ques:Answer the following question given this paragraph:   Humans have an estimated 20,000 to 22,000 genes. This may sound like a lot, but it really isn’t. Far simpler species have almost as many genes as humans. However, human cells use splicing and other processes to make multiple proteins from the instructions encoded in a single gene. Of the 3 billion base pairs in the human genome, only about 25 percent make up genes and their regulatory elements. The functions of many of the other base pairs are still unclear. To learn more about the coding and noncoding sequences of human DNA, watch the animation at this link: http://www. hhmi. org/biointeractive/dna/DNAi_coding_sequences. html .   Q: Humans have an estimated 20,000 to 22,000 of what units of heredity?   Choices:  - eggs  - cells  - chromosomes  - genes  A:

Ans:genes
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Ques:Answer the following question given this paragraph:   Physical science, in turn, can be divided into chemistry and physics. Chemistry is the study of matter and energy at the scale of atoms and molecules. For example, the synthetic fibers in the swimmer’s suit were created in labs by chemists. Physics is the study of matter and energy at all scales—from the tiniest particles of matter to the entire universe. Knowledge of several important physics concepts—such as motion and forces—contributed to the design of the swimmer’s suit.   Q: The physical sciences can be divided into physics and what other science?   Choices:  - biology  - astrology  - phsycology  - chemistry  A:

Ans:chemistry
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Ques:Answer the following question given this paragraph:   Structures of the Nonmetals The structures of the nonmetals differ dramatically from those of metals. Metals crystallize in closely packed arrays that do not contain molecules or covalent bonds. Nonmetal structures contain covalent bonds, and many nonmetals consist of individual molecules. The electrons in nonmetals are localized in covalent bonds, whereas in a metal, there is delocalization of the electrons throughout the solid. The noble gases are all monatomic, whereas the other nonmetal gases—hydrogen, nitrogen, oxygen, fluorine, and chlorine—normally exist as the diatomic molecules H2, N2, O2, F2, and Cl2. The other halogens are also diatomic; Br2 is a liquid and I2 exists as a solid under normal conditions. The changes in state as one moves down the halogen family offer excellent examples of the increasing strength of intermolecular London forces with increasing molecular mass and increasing polarizability. Oxygen has two allotropes: O2, dioxygen, and O3, ozone. Phosphorus has three common allotropes, commonly referred to by their colors: white, red, and black. Sulfur has several allotropes. There are also many carbon allotropes. Most people know of diamond, graphite, and charcoal, but fewer people know of the recent discovery of fullerenes, carbon nanotubes, and graphene. Descriptions of the physical properties of three nonmetals that are characteristic of molecular solids follow.   Q: Nonmetal structures contain what type of bonds?   Choices:  - prevalent  - polymeric  - gravitational  - covalent  A:

Ans:covalent
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Ques:Answer the following question given this paragraph:   Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected. One species typically uses the other for a purpose other than food. For example, mites attach themselves to larger flying insects to get a “free ride. ” Hermit crabs use the shells of dead snails for homes.   Q: What is the name of the symbiotic relationship in which one species benefits while the other species is not affected?   Choices:  - pollenation  - differentiation  - mutualism  - commensalism  A:

Ans:

assistant: commensalism
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