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Penn Foster - Biology Lesson 1, The Nature of Science, the Chemistry of Life, and Ecology, Exercise Answer Key 100%Pass What is the scientific method? A systematic approach to investigating natural phenomena through observation, hypothesis formation, experimentation, and analysis. W...

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  • September 6, 2024
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Penn Foster - Biology Lesson 1, The
Nature of Science, the Chemistry of Life,
and Ecology, Exercise Answer Key
100%Pass
What is the scientific method?


✔✔ A systematic approach to investigating natural phenomena through observation, hypothesis

formation, experimentation, and analysis.




What are the four major elements that make up most of the human body?


✔✔ Carbon, hydrogen, oxygen, and nitrogen.




What is the role of enzymes in biochemical reactions?


✔✔ Enzymes act as catalysts to speed up chemical reactions without being consumed in the

process.




What is a hypothesis?


✔✔ An educated guess or proposed explanation that can be tested through experimentation and

observation.




1

,What are the basic building blocks of proteins?


✔✔ Amino acids.




How do ionic bonds differ from covalent bonds?


✔✔ Ionic bonds involve the transfer of electrons between atoms, while covalent bonds involve

the sharing of electrons.




What is the primary function of carbohydrates in living organisms?


✔✔ To provide a primary source of energy and serve as structural components.




What is an ecosystem?


✔✔ A biological community of interacting organisms and their physical environment.




What are producers in an ecosystem?


✔✔ Organisms that produce their own food through photosynthesis or chemosynthesis, typically

plants and algae.




What is the role of decomposers in an ecosystem?


2

, ✔✔ To break down dead organisms and waste products, recycling nutrients back into the

environment.




What is a biome?


✔✔ A large geographic biotic unit characterized by its climate, soil, and the plant and animal life

it supports.




What are the three main types of ecological pyramids?


✔✔ Pyramids of numbers, biomass, and energy.




What is the significance of the water cycle in ecology?


✔✔ The water cycle redistributes water through the environment, supporting all forms of life

and regulating climate.




What is a buffer in the context of chemistry?


✔✔ A substance that helps maintain a stable pH by neutralizing excess acids or bases.




What is a controlled experiment?



3

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