The Scientific Method

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Questions and Answers

A researcher observes that a certain plant species grows taller in direct sunlight compared to shade. Which of the following is the most logical next step in the scientific method?

  • Publish the observation in a scientific journal.
  • Formulate a hypothesis about the relationship between sunlight and plant growth. (correct)
  • Ignore the observation as anecdotal evidence.
  • Immediately conclude that sunlight is essential for the plant's growth.

Which of the following best describes the role of a control group in an experiment?

  • To introduce bias into the experiment.
  • To measure the dependent variable.
  • To provide a baseline for comparison with the experimental group. (correct)
  • To manipulate the independent variable.

A scientist is testing the effect of a new fertilizer on plant growth. What is the independent variable in this experiment?

  • The type of plant used.
  • The amount of fertilizer applied. (correct)
  • The height of the plants.
  • The temperature of the room.

Which of the following is NOT a tenet of the cell theory?

<p>Cells can spontaneously generate from non-living matter. (B)</p> Signup and view all the answers

What is the primary difference between prokaryotic and eukaryotic cells?

<p>Eukaryotic cells have a nucleus, while prokaryotic cells do not. (A)</p> Signup and view all the answers

In which organelle does cellular respiration primarily occur?

<p>Mitochondrion (A)</p> Signup and view all the answers

Which type of transport requires energy to move molecules against their concentration gradient?

<p>Active Transport (A)</p> Signup and view all the answers

What is the role of enzymes in biochemical reactions?

<p>To catalyze (speed up) the reaction without being consumed. (C)</p> Signup and view all the answers

During which phase of mitosis are sister chromatids separated and pulled to opposite poles of the cell?

<p>Anaphase (B)</p> Signup and view all the answers

Which process results in the greatest amount of genetic variation in a population?

<p>Meiosis (B)</p> Signup and view all the answers

What is the central dogma of molecular biology?

<p>DNA → RNA → Protein (D)</p> Signup and view all the answers

In a monohybrid cross between two heterozygous parents (Aa), what is the probability of producing an offspring with the homozygous recessive genotype (aa)?

<p>25% (C)</p> Signup and view all the answers

A mutation occurs in a gene that codes for a protein. Which of the following outcomes is LEAST likely?

<p>The mutation has no effect on the organism's phenotype. (D)</p> Signup and view all the answers

Which of the following mechanisms of evolution involves random changes in allele frequencies due to chance events?

<p>Genetic Drift (B)</p> Signup and view all the answers

What is the role of decomposers in an ecosystem?

<p>To break down dead organic matter and release nutrients back into the environment. (D)</p> Signup and view all the answers

Which of the following represents the correct order of levels of ecological organization, from smallest to largest?

<p>Organism, Population, Community, Ecosystem (C)</p> Signup and view all the answers

Which biogeochemical cycle involves the processes of nitrogen fixation, nitrification, and denitrification?

<p>Nitrogen Cycle (A)</p> Signup and view all the answers

What is carrying capacity?

<p>The maximum population size that an environment can sustain indefinitely. (B)</p> Signup and view all the answers

Which of the following human activities contributes most significantly to the increase in atmospheric carbon dioxide?

<p>Burning of fossil fuels (A)</p> Signup and view all the answers

What is the primary goal of sustainable living?

<p>To use resources in a way that meets current needs without compromising the ability of future generations to meet their own needs. (D)</p> Signup and view all the answers

Flashcards

Observation

The process of noting and describing phenomena.

Hypothesis Formation

Developing testable ideas based on observations.

Experimentation and Variables

Designing experiments, controlling independent, dependent, and controlled variables.

Data Collection and Analysis

Using charts, graphs, and tables; statistical thinking; interpreting results.

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Conclusion and Communication

Forming conclusions based on data and communicating findings.

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Prokaryotic Cells

Bacteria and archaea cells that lack a nucleus.

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Eukaryotic Cells

Plant, animal, fungi, and protist cells that contain a nucleus.

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Nucleus

The control center of the cell that contains DNA.

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Mitochondria

Powerhouse of the cell, produces ATP through cellular respiration.

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Chloroplasts

The organelle that conducts photosynthesis in plants.

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Proteins

Structure and function, includes amino acids, primary, secondary, tertiary, quaternary structures, and enzymes as biological catalysts.

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Carbohydrates

Simple sugars, polysaccharides, and their role in energy storage and structural support.

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Lipids

Fats, oils, phospholipids, and their role in membranes and energy storage.

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Nucleic Acids

DNA and RNA structure, and their roles in genetics and protein synthesis.

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Cellular Respiration

Breaking down glucose to produce ATP (glycolysis, Krebs cycle, electron transport chain).

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Photosynthesis

Light-dependent and light-independent reactions, chlorophyll function, and energy conversion in plants.

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Mitosis

Phases (prophase, metaphase, anaphase, telophase, cytokinesis) and its role in growth and repair.

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Meiosis

The process of producing gametes and genetic variation.

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DNA Structure and Function

Double helix model, replication process, and how genetic information is stored.

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Gene Expression

Transcription and translation processes; regulation of gene expression.

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Study Notes

  • Understanding the scientific process is crucial for answering experimental questions and thinking like a scientist.

The Scientific Method

  • Observation involves noting and describing phenomena.
  • Hypothesis Formation is developing testable ideas based on observations.
  • Experimentation and Variables includes designing experiments and controlling variables (independent, dependent, controlled).
  • Data Collection and Analysis involves using charts, graphs, tables, statistical thinking, and interpreting results.
  • Conclusion and Communication cover forming conclusions based on data and communicating findings.

Laboratory Techniques and Safety

  • Familiarity with common tools and equipment used in biology labs is essential.
  • Proper safety protocols and procedures are necessary during experiments.

Critical Thinking and Problem Solving

  • Analyzing experimental designs for strengths and weaknesses is important.
  • Recognizing bias and making valid inferences from provided data is crucial.

Cell Theory and Classification:

  • Cell theory has three tenets.
  • Prokaryotic cells (bacteria and archaea) differ from eukaryotic cells (plants, animals, fungi, protists).

Cell Structure and Organelles:

  • Animal and plant cells have distinguishing features like cell walls and chloroplasts in plants.
  • Organelles include the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles.

Membrane Structure and Function:

  • The cell membrane follows the fluid mosaic model.
  • Transport mechanisms through the membrane include diffusion, osmosis, facilitated diffusion, active transport, endocytosis, and exocytosis.

Biomolecules and Macromolecules:

  • Proteins' structure includes amino acids, primary, secondary, tertiary, and quaternary structures; they function as enzymes and biological catalysts.
  • Carbohydrates include simple sugars and polysaccharides, and are important for energy storage and structural support.
  • Lipids include fats, oils, and phospholipids, playing a role in membranes and energy storage.
  • Nucleic Acids include DNA and RNA; they play a key role in genetics and protein synthesis.

Metabolism and Energy Transformations:

  • Cellular Respiration breaks down glucose to produce ATP through glycolysis, the Krebs cycle, and the electron transport chain.
  • Photosynthesis involves light-dependent and light-independent reactions, chlorophyll function, and energy conversion in plants.

Cell Cycle and Division:

  • Mitosis includes phases (prophase, metaphase, anaphase, telophase, cytokinesis) and its role in growth and repair.
  • Meiosis produces gametes and causes genetic variation, differing from mitosis.

Fundamentals of Genetics:

  • DNA's Structure and Function follows the double helix model; replication stores genetic information.
  • Gene Expression includes transcription and translation processes; regulation of gene expression.

Mendelian Genetics:

  • Inheritance Patterns include dominant and recessive traits, codominance, and incomplete dominance.
  • Punnett Squares and Probability can predict outcomes of genetic crosses; includes monohybrid and dihybrid crosses.
  • Non-Mendelian Inheritance includes polygenic traits, multiple alleles, and genetic linkage.

Molecular Genetics:

  • Mutations include types like point mutations, insertions, and deletions, and have causes and consequences.
  • Genetic Technologies include basic concepts of biotechnology such as DNA fingerprinting and genetic engineering.

Evolution and Natural Selection:

  • Mechanisms of Evolution include natural selection, genetic drift, gene flow, and mutation.
  • Adaptation and Speciation cause populations to change over time; evidence supports evolution through fossil records, comparative anatomy, and molecular data.
  • Evolutionary Theories include Darwin’s theory of evolution and modern synthesis concepts.

Ecological Interrelationships:

  • Levels of Organization include organism, population, community, ecosystem, biome, and biosphere.
  • Food Chains and Food Webs have trophic levels, energy pyramids, and energy flow through ecosystems.

Biogeochemical Cycles:

  • Water, carbon, and nitrogen cycles play key roles in maintaining life.

Population Dynamics:

  • Carrying capacity, population growth models (exponential vs. logistic), and interactions occur among populations.

Human Impact on the Environment:

  • Environmental Issues include pollution, deforestation, climate change, invasive species, and conservation efforts.
  • Sustainability involves renewable vs. nonrenewable resources, and strategies for sustainable living.

Organismal Biology:

  • Anatomy and Physiology involve how organ systems work together in plants and animals.
  • Homeostasis includes regulation and feedback mechanisms that maintain balance within an organism.

Diversity of Life:

  • Classification and Taxonomy include understanding the five kingdoms or newer classification systems; criteria classifies them.

Application of Knowledge:

  • Data Interpretation involves interpreting various representations of data (graphs, tables, diagrams).
  • Experimental Design includes being able to critique or design experiments that test specific hypotheses related to biological concepts.

Study and Test-Taking Strategies:

  • Effective Note-Taking and Review involves creating concept maps, flashcards, and utilizing practice tests.
  • Time Management includes techniques for pacing during the exam and strategies for educated guessing when needed.

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