The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

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The Chemistry of Life Ch. 4.1-4.3

Transcript of The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Page 1: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

The Chemistry of Life

Ch. 4.1-4.3

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Page 2: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Recall: Levels of Organization

Page 3: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Biology Depends on Chemistry• In our biosphere, everything is made of atoms• Through the interaction of chemicals we can better

understand our biosphere

Page 4: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Atoms• Basic unit of matter• Protons

o (+) chargeo In nucleus

• Neutronso (0) chargeo In nucleus

• Electronso (-) charge o Around nucleus at varying energy levels

Page 5: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Molecules• 2 or more atoms held

together by chemical bonds

• Importance to biology: macromolecules make up cells and cellular components

Page 6: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Chemical Bonds: Ionic• Electrons transferred

from one atom to another• Ex: NaCl (salt)

• Importance to biology: many salts are made this way (homeostatic balance)

Page 7: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Chemical Bonds: Covalent

• Electrons are shared between atomso Ex: CO2

• Importance to biology: carbon compounds, water

Page 8: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Chemical Bonds: Hydrogen

• Weak bond formed from by the attraction of two electronegative moleculeso Slightly positive, slightly negative

ends

• Importance to biology: critical to water’s properties, holds DNA together

Page 9: The Chemistry of Life Ch. 4.1-4.3. Recall: Levels of Organization.

Chemical Reactions

• Synthesiso Make a compoundo Ex: Photosynthesis

• Decompositiono Break down a compoundo Ex: Cellular Respiration

• Both reactions important to biology: metabolism


4.1-4.3 Quiz Review

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