College Biology Spring Final

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1. What are the three main types of symmetry found in animals? Briefly describe each type and give one example of an animal that exhibits each kind. (20pts)

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• Asymmetry: animals that do not have an orderly body plan (sponges)

• Radial symmetry: animals that have body parts that are arranged in a circle around the central point (starfish)

• Bilateral symmetry: animals whose body consists of two similar halves (butterflies)

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1. What is convergent evolution, and how does it result in similar traits in unrelated species? Provide an example of convergent evolution in the animal kingdom. (15 pts)

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• Convergent evolution is the process where distantly related organisms independently evolve similar traits to adapt to similar necessities. It results in similar traits in unrelated species because these animals or plants share the same environments and have the same pressures. An example of convergent evolution is that dolphins (mammal), penguins (bird), and tuna (fish) all have fins but they aren’t in the same category of organism. 

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1. Discuss how the Scientific Revolution of the 16th and 17th centuries changed the way humans understand the natural world. In your answer, consider the roles of key figures, the impact of technological developments, and the shift from traditional to empirical methods of inquiry. (25pts)

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• The Scientific Revolution of the 16th and 17th centuries changed the way humans understand the natural world by shifting from ancient authority to empirical evidence. Isaac Newton created the laws of motion and gravity, Keplen created the law of planetary motion, and Harvey discovered the circulation of blood. Some of the technological developments include the telescope and microscope which helped with the development of new scientific methods. The telescope specifically provided empirical evidence and new ideas in astronomy.

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1. Compare and contrast classical and operant conditioning in relation to animal behavior. (20pts)

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• Both forms of conditioning modify behavior and train animals. Classical conditioning is where you give something a signal that is not a reward or a punishment. An example of this is Pavlov's dog associated the bell with hunger. Operant conditioning involves training an animal to do something with a punishment or a reward.

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1. List and describe the 5 categories of evolutionary evidence. (20pts)

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• Fossils: any trace of an organism that has been preserved through natural processes

• Biogeography: geological distribution of organisms throughout the earth (Pangea)

• Molecular Biology: common DNA and protein evidence

• Anatomy: homologous structures, vestigial structures, and analogous structures

Embryology: closely related organisms go through similar stages of development

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1. What is informed consent, and why is it essential to conducting ethical scientific research involving human participants? (20pts)

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• Informed consent is voluntary agreement to participate in research. It is essential to conducting ethical scientific research involving human participants because of full disclosure of risks and benefits. Everyone involved in an experiment must be made aware of all of the factors of the research process. There must be a clear explanation of the research purpose, the right to withdraw from the experiment at any time, and there must be documentation and transparency. It is essential while conducting ethical scientific research involving human participants to have informed consent because the participants must know every single part of the experiment for legal purposes. An example of the need for informed consent is the Tuskegee Study where it resulted in reforms.

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1. Compare and contrast primary and secondary succession in Ecology. (20pts)

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• Primary succession is where everything is wiped out to rocks and life has to be restarted from the ground up and starts with no soil. It happens on newly formed, lifeless land. Secondary succession is where ecosystems are rebuilt where there is just vegetation and soil left. They are both natural processes that happen over time, but they differ in their starting conditions.

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1. How does photosynthesis contribute to the carbon cycle, and why is it important for regulating atmospheric carbon dioxide levels? (20pts)

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• Photosynthesis removes carbon dioxide from the atmosphere and turns it into sugars that are energy-rich for plants. This regulates the carbon dioxide levels and helps produce oxygen. It is important to regulate carbon levels because our earth needs to maintain its temperature to help minimize climate change.

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1. What is a mutation, and how does it contribute to biodiversity within a population? (15pts)

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• Mutations are changes in the DNA and genetic makeup of organisms. These changes happen randomly in a DNA sequence This contributes to the biodiversity within a population because it introduces new alleles and variations into the gene pool, which helps with natural selection and evolution,