SCIENCE MIDTERM

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41 Terms

1

Scientific Method

A series of steps: Question, Hypothesis, Experiment, Observation, Conclusion.

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2

Hypothesis

A proposed explanation for a phenomenon or question that can be tested.

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3

Independent Variable

The variable that is changed or controlled in a scientific experiment.

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4

Dependent Variable

The variable that is measured or affected in an experiment.

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5

Control Group

The group that does not receive the experimental treatment and is used for comparison.

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6

Experimental Group

The group that receives the treatment or condition being tested.

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7

Homeostasis

The ability of an organism to maintain a stable internal environment.

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8

Photosynthesis

The process by which plants, algae, and some bacteria convert light energy into chemical energy.

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9

Osmosis

The diffusion of water across a selectively permeable membrane.

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10

Diffusion

Movement of particles from an area of high concentration to an area of low concentration.

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11

Amino Acids

The building blocks of proteins.

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12

Mitochondria

The organelle where aerobic respiration occurs.

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13

Cell Membrane

The structure that regulates what enters and leaves the cell.

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14

Negative Feedback Loop

A process that counteracts a change in a system to maintain balance.

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15

Positive Feedback Loop

A process that amplifies change in a system, making it more extreme.

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16

Glucose

A simple sugar that is an important energy source in living organisms.

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17

Nucleic Acids

Biomacromolecules such as DNA and RNA that store genetic information.

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18

Cell Theory

The theory that all living things are composed of cells, the basic unit of life.

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19

Prokaryotic Cells

Cells that lack a nucleus and membrane-bound organelles.

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20

Eukaryotic Cells

Cells that contain a nucleus and membrane-bound organelles.

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21

Chloroplasts

Organelles in plant cells where photosynthesis occurs.

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22

Chlorophyll

The green pigment in plants that absorbs light for photosynthesis.

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23

ATP

Adenosine triphosphate, the energy currency of the cell.

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24

Anaerobic Respiration

Respiration that occurs without oxygen, producing less ATP.

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25

Aerobic Respiration

Respiration that requires oxygen and produces more ATP.

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26

Kidneys

Organs that play a key role in osmoregulation and maintaining water balance.

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27

Feedback Mechanism

Processes that utilize information to maintain internal stability.

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28

Lactic Acid

A byproduct of anaerobic respiration, often associated with muscle fatigue.

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29

Variables

Factors in an experiment that can change.

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30

Adaptation through Evolution

The process by which species adjust to their environment to survive.

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31

Data Table

A structured format for organizing and presenting experimental data.

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32

Graph Types

Various forms of data representation, including bar, line, and pie charts.

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33

Cell Organelles

Specialized structures within a cell that perform distinct functions.

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34

Osmoregulation

The regulation of water and solute concentrations within an organism.

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35

Energy Use

The way living organisms obtain and utilize energy to perform biological functions.

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36

Stimuli

Changes in the environment that provoke a response in living organisms.

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37

Comparison of Gas Exchange

Examining how respiration varies across different organisms and their environments.

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38

Yeast Investigation

An experiment to observe cellular respiration in yeast under varying oxygen levels.

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39

Graphing Changes During Exercise

Analyzing how blood oxygen levels fluctuate with physical activity.

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40

Cellular Respiration Equation

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP.

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41

Photosynthesis Equation

6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂.

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