Biology 150 Final Exam Study Guide Verified 100%(GRADED A+)

A correct statement about growth and development is: - ANSWER the germination of a seed is an example of growth and development. A water sample from a tropical stream contains a single-celled organism thought to cause sickness in nearby cattle. The organism has a cell wall and no membrane bound nucleus. - ANSWER It is most likely classified as Shigella boydii, a unicellular bacteria. Researchers formulate a null hypothesis in addition to a hypothesis when designing an experimental study because - ANSWER a null hypothesis specifies what a research should observe when the hypothesis being tested is NOT supported by the data. The RNA World Hypothesis suggests that life on Earth began with RNA molecules. These RNA molecules could replicate, function as simple enzymes, and even evolve. When enclosed in a phospholipid bilayer, these structures resemble cells. They are not considered cells because - ANSWER all cells have DNA as a genetic material. Scientific theories differ from scientific hypothesis because - ANSWER Theories are usually an explanation for a more general phenomenon and hypothesis typically address more specific issues. Helicobacter is a type of bacteria that can enter your body and live in your digestive tract. Over time, they can cause ulcers and even stomach tumors (cancer). You are asked to determine how long a culture of stomach cells must be exposed to these bacteria to become infected. - ANSWER The best data can be collected by measuring the number of tumors formed in cultures exposed to helicobacter for different lengths of time. About twenty-five of the ninety-two elements are known to be essential to life. The four of these 25 elements that make up approximately 96 percent of living matter are - ANSWER carbon, hydrogen, nitrogen, and oxygen. A covalent chemical bond is one in which valence electrons of two atoms are - ANSWER shared so as to satisfactorily fill their respective orbitals. Hydrocarbons are insoluble in water because - ANSWER the majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages. Nonpolar amino acids residues are typically found in the interior of globular proteins like chymotrypsin. Based on these nonpolar amino acids, the chemical force that is most directly responsible for holding together the interior of the globular protein is - ANSWER hydrophobic interactions.