Biology Study Guide: Key Concepts and Step-by-Step Guidance

Q1. What properties do all living things share? Can you describe these properties? Is it always ‘crystal clear’ whether an organism is ‘alive’ or not (think: viruses)?

Background

Topic: Characteristics of Life

This question tests your understanding of the fundamental properties that define living organisms and the complexity of defining life, especially in ambiguous cases like viruses.

Key Terms:

• Living things: Organisms that exhibit certain properties such as organization, metabolism, homeostasis, growth, reproduction, response to stimuli, and adaptation.

• Viruses: Biological entities that challenge the definition of life because they exhibit some, but not all, characteristics of living things.

Step-by-Step Guidance

1. List the main properties that biologists use to define life (e.g., order, regulation, energy processing, growth and development, reproduction, response to the environment, evolutionary adaptation).

2. Briefly describe what each property means in the context of living organisms.

3. Consider examples of entities that challenge the definition of life, such as viruses, and think about which properties they do or do not possess.

4. Reflect on why it can be difficult to draw a clear line between living and non-living things.

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Q2. What are the three domains of life? What domain are plants in? What about fungi? Prokaryotes? Eukaryotes, etc.? Are single-celled organisms only in the domains bacteria and archaea? What are four kingdoms within the Eukarya, and how do we distinguish them? How do fungi acquire food? What about plants? Animals?

Background

Topic: Classification of Life

This question is about the major domains and kingdoms of life, and how organisms are classified based on cellular structure and modes of nutrition.

Key Terms:

• Domain: The highest taxonomic rank, including Bacteria, Archaea, and Eukarya.

• Kingdom: A major category within domains, such as Plantae, Fungi, Animalia, and Protista within Eukarya.

• Prokaryote: Organisms without a nucleus (Bacteria and Archaea).

• Eukaryote: Organisms with a nucleus (Eukarya).

Step-by-Step Guidance

1. Identify the three domains of life and give a brief description of each.

2. Determine which domain each group (plants, fungi, prokaryotes, eukaryotes) belongs to.

3. List the four kingdoms within the domain Eukarya and describe a distinguishing feature of each.

4. Explain how fungi, plants, and animals acquire food (e.g., absorption, photosynthesis, ingestion).

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Q3. Can you list each of the hierarchical levels that biologists use to describe life on earth (biosphere → ecosystem → community, etc.)? What characterizes each level? For example, what makes up a population? A community, etc.? If a scientist is studying how a butterfly species interacts with a species of coneflower plant, the biologist is studying life at the level of ______.

Background

Topic: Biological Organization

This question tests your knowledge of the levels of biological organization and the characteristics that define each level.

Key Terms:

• Biosphere, ecosystem, community, population, organism, organ system, organ, tissue, cell, organelle, molecule.

Step-by-Step Guidance

1. List the levels of biological organization from largest (biosphere) to smallest (molecule).

2. Define each level and what distinguishes it from the others.

3. Use the example of a butterfly and coneflower interaction to determine which level of organization is being studied.

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Q4. Can you describe the general steps of the scientific process? Is this a linear or circular process? What are independent vs dependent variables? If given an experiment and results, can you pick out various components (hypothesis, control, independent variable, dependent variable, question, etc.)?

Background

Topic: Scientific Method

This question is about understanding the steps of scientific inquiry and being able to identify variables and components of an experiment.

Key Terms:

• Scientific method: A systematic approach to investigation.

• Independent variable: The variable that is manipulated.

• Dependent variable: The variable that is measured.

• Control group: The group that does not receive the experimental treatment.

Step-by-Step Guidance

1. List the general steps of the scientific method (e.g., observation, question, hypothesis, experiment, data collection, analysis, conclusion).

2. Discuss whether the process is linear or can be revisited at different stages.

3. Define independent and dependent variables and give an example.

4. Practice identifying these components in a sample experiment scenario.

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Q5. Define and distinguish between the following terms: qualitative and quantitative data, independent and dependent variables, hypothesis, x-axis and y-axis. Can you look at a graph and determine the x-axis, y-axis, independent variable(s), and dependent variable? What is a hypothesis? What are experimental constants (standardized variables – NOT controls)? What is a control group?

Background

Topic: Experimental Design and Data Analysis

This question focuses on understanding types of data, variables, and components of experimental design, as well as interpreting graphs.

Key Terms:

• Qualitative data: Descriptive, non-numerical information.

• Quantitative data: Numerical measurements.

• Hypothesis: A testable statement or prediction.

• Experimental constants: Variables kept the same across all groups.

Step-by-Step Guidance

1. Define each term and explain how they differ (e.g., qualitative vs quantitative data).

2. Describe how to identify independent and dependent variables in an experiment and on a graph (x-axis vs y-axis).

3. Explain the role of experimental constants and control groups in experimental design.

4. Practice by analyzing a sample graph or experiment description.

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Q6. Distinguish between continuous and discrete data, and determine what type of graph should be used to represent continuous vs discrete data. Are qualitative data considered discrete or continuous? What type of graph would you use to display these data? What about quantitative data – discrete or continuous? What type of graphs would you use to display these data?

Background

Topic: Data Types and Graphing

This question is about understanding different types of data and how to represent them graphically.

Key Terms:

• Continuous data: Can take any value within a range (e.g., height, temperature).

• Discrete data: Can only take specific values (e.g., number of students).

• Qualitative data: Descriptive categories.

• Quantitative data: Numerical values.

Step-by-Step Guidance

1. Define continuous and discrete data and give examples of each.

2. Explain which types of graphs (e.g., bar graph, line graph, pie chart) are appropriate for each data type.

3. Discuss whether qualitative data are discrete or continuous and how to graph them.

4. Do the same for quantitative data.

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Q7. Evaluate the scientific validity of different types of information. Does correlation = causation? I.e., just because two variables are correlated, does that mean you can infer causation?

Background

Topic: Scientific Reasoning and Data Interpretation

This question tests your ability to critically evaluate scientific claims and understand the difference between correlation and causation.

Key Terms:

• Correlation: A relationship or association between two variables.

• Causation: One variable directly affects another.

Step-by-Step Guidance

1. Define correlation and causation and explain the difference.

2. Give an example where two variables are correlated but not causally related.

3. Discuss why it is important to distinguish between correlation and causation in scientific studies.

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Q8. Can you define fitness and adaptation? What are the four key observations/steps by Darwin that generally describe evolution by natural selection?

Background

Topic: Evolution and Natural Selection

This question is about understanding the concepts of fitness and adaptation, and the process of natural selection as described by Darwin.

Key Terms:

• Fitness: The ability of an organism to survive and reproduce in its environment.

• Adaptation: A trait that increases an organism's fitness.

• Natural selection: The process by which organisms with advantageous traits survive and reproduce more successfully.

Step-by-Step Guidance

1. Define fitness and adaptation in the context of evolution.

2. List and briefly describe the four key observations or steps that Darwin used to explain natural selection.

3. Think about examples that illustrate these concepts.

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