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Lecture notes of 63 pages for the course Penn Foster College at Penn Foster College (biology)

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BIO NOTES

,b
- Bio chem- study of chemical reactions and
pathways of living cells and organisms.
● The carbon atom is important to biochemistry. Carbon forms the basis of life and is central

to the compounds and molecules that impact biological functions.

● Proteins control the structure and function of cells. They're made of different amino acid

combinations linked together.

● The primary structure is simply the connection of amino acid to form polypeptide chains.

● The secondary structure refers to the folded regions that occur when the amino acids are

combined due to interactions between atoms making up the amino acid backbone.

● The tertiary structure of a protein is its three-dimensional shape, largely driven by

hydrophobic (water-repelling) areas of the protein that prefer to be buried in the inside of

a cell structure

,Nucleic Acids
Are composed of nucleotides- 3 components

1. A 5 carbon sugar (ribose)

2. Phosphate group

3. Nitrogenous base

RNA and DNA MAJOR CLASSES - nuclei acids

DNA Carrie’s genetic information such as

Cell type

Cell function

When the cell will grow or divide

How the cell will make the lipids, carbohydrates, enzymes, and other molecules it and the

organisms to survive

, Cell Discovery
multiple cellular-level processes are happening simultaneously

Cell theory six primary tenets

1. All living organisms are made of cell

2. Cells are the basic unit of life

3. All the cells arise if preexisting cells

4. Hereditary information is passed from cell to cell

5. All cells have the same basic chemical composition

6. Energy ow occurs within cells

All organisms are composed of cells, and every cell shares at least four key components.

1. Every cell has a plasma membrane that separates the cell's interior environment from its

exterior environment.

2. Every cell has cytosol, a jelly-like uid in which intracellular organelles are suspended.

Organelles are specialized cellular structures that have speci c functions within the cell.

The space within the cell that contains the cytosol is called cytoplasm.

3. Every cell contains chromosomes that carry genes in the form of DNA.

4. Every cell also contains ribosomes, which synthesize proteins.




cells can be divided into two major categories—prokaryotic cells and eukaryotic cells.




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