Mass Number

Equal to the number of protons plus number of neutrons found in the nucleus.

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Proton, Neutron, Electrons

Subatomic particles than make up an atom.

• Protons are positively charged and located in the nucleus. The number of protons = Atomic Number.
• Neutrons have no charge and are located in the nucleus.
• Electons are negatively charged and are located in the electron cloud which encircles the nucleus. 
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Cohesion

Attraction between molecules of the same substance. Explanation why drops of water form beads on a smooth surface.

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Adhesion

Attraction between molecules of different substances. Explains why a meniscus forms when water is in a graduated cylinder.

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Organic

Contains Carbon. There are four groups found in living things: carbohydrates, lipids, nucleic acids, and proteins.

Active site of Enzyme

Part that fits into the substrate. If destroyed, the enzyme will not work.

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Contractile vacuole of Paramecium

Pumps excess water out of an organism to maintain homeostasis.

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Mean value

Average of a set of values

Scientific Research

Uses the scientific method to find answers to questions.

Positive correlation

A relationship between two variables such that their values increase or decrease together. 

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Negative Correlation

A relationship between two variables in which one variable increases as the other decreases, and vice versa. 

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Joseph Priestly

English minister that experimented to see if something in the air was necessary to keep a candle burning. He found that it was oxygen, which is released during photosynthesis. 

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Jan van Helmont

Experimented to find out if ploants grew by taking materials out of the soil. He concluded that most of the mass gained by the tree had come form water, since water was the only thing he added to the pot of soil.

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Activiation Energy

Energy that is needed to get a reaction started.

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Mammal

Have hair or fur; four-chambered heart; use lungs for respiration; get milk from mother.

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Catalyst

Substance that speeds up the reate of a chemical reaction. Work by lowering a reaction's activation energy.

Phagocytosis

 Engulfing of solid particles or when large particles are taken into the cell by endocytosis.

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Dichotomous Key

A tool that allows the user to determine the identity of items in the natural world.

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Grana

A stack of thylakoids

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Inoculate

 To implant (a disease agent or antigen) in a person, animal, or plant to produce a disease for study or to stimulate disease resistance.

Incubate

To keep something in proper conditions for development.