Problem:OPTIONS:
- anal
- cervical
- spinal
- thoracic

Answer the following question given this paragraph: There is always a slightly negative pressure within the thoracic cavity, which aids in keeping the airways of the lungs open. During inhalation, volume increases as a result of contraction of the diaphragm, and pressure decreases (according to Boyle's Law). This decrease of pressure in the thoracic cavity relative to the environment makes the cavity less than the atmosphere (Figure 39.16a). Because of this drop in pressure, air rushes into the respiratory passages. To increase the volume of the lungs, the chest wall expands. This results from the contraction of the intercostal muscles, the muscles that are connected to the rib cage. Lung volume expands because the diaphragm contracts and the intercostals muscles contract, thus expanding the thoracic cavity. This increase in the volume of the thoracic cavity lowers pressure compared to the atmosphere, so air rushes into the lungs, thus increasing its volume. The resulting increase in volume is largely attributed to an increase in alveolar space, because the bronchioles and bronchi are stiff structures that do not change in size. Q: There is always a slightly negative pressure within what cavity, helping keep the airways of the lungs open? A:
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A: thoracic

Problem:OPTIONS:
- photosynthesis
- subtractive synthesis
- organism synthesis
- protein synthesis

Answer the following question given this paragraph: Gene expression and protein synthesis are usually considered the same molecular process. Q: Gene expression and what else are usually considered the same molecular process? A:
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A: protein synthesis

Problem:OPTIONS:
- genome
- nucleolus
- bacterium
- chromosome

Answer the following question given this paragraph: Genes that are located on the same chromosome are called linked genes . Alleles for these genes tend to segregate together during meiosis, unless they are separated by crossing-over. Crossing-over occurs when two homologous chromosomes exchange genetic material during meiosis I. The closer together two genes are on a chromosome, the less likely their alleles will be separated by crossing-over. At the following link, you can watch an animation showing how genes on the same chromosome may be separated by crossing-over: http://www. biostudio. com/d_%20Meiotic%20Recombination%20Between%20Linked%20Genes. htm . Q: Linked genes are located on the same what? A:
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A: chromosome

Problem:OPTIONS:
- Australia
- Europe
- Africa
- antarctica

Answer the following question given this paragraph: Amphibians can be found in freshwater and moist terrestrial habitats throughout the world. The only continent without amphibians is Antarctica. Amphibians are especially numerous in temperate lakes and ponds and in tropical rainforests. Q: What is the only continent without amphibians? A:
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A:
antarctica