BIO 204 CH. 2
1. Define atom: Nucleus of protons and neutrons surrounded by an orbiting cloud of electrons, when atoms
have a charge they are called ions
2. Know the three subatomic particles, where they are located, and what their
charges are:: Proton: in the nucleus of an atom that has a positive charge
Neutron: in the nucleus of an atom that has no charge
Electron: orbits the nucleus with a negative charge
3. What is a covalent bond? Is it intra or intermolecular? Know the example given
the notes:: - Covalent between two atoms caused by the sharing of electrons
- Intramolecular (inside)
- Within a water molecule
4. What is an ionic bond? Is it intra or intermolecular? Know the example given
in the notes:: - Between two ions due to the attraction of opposite electrical charges
- Intramolecular
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, - Salt (NaCl)
5. What is a hydrogen bond? Is it intra or intermolecular? Know the example
given in the notes:: - Between positive end of one molecule and negative end of another molecule, needs
more than one molecule present
- Intermolecular (between molecules)
- Between H20 molecules
- Weakest bond
6. What are the macromolecules found in cells?: - Proteins
- Nucleic acids
- Lipids
- Carbohydrates
7. What is the building block of a protein?: Amino acids
8. What is the building block of a lipid?: Fatty acids
9. What is the building block of a carbohydrate?: Glucose
10. What is the building block of a nucleic acid?: Nucleotides
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1. Define atom: Nucleus of protons and neutrons surrounded by an orbiting cloud of electrons, when atoms
have a charge they are called ions
2. Know the three subatomic particles, where they are located, and what their
charges are:: Proton: in the nucleus of an atom that has a positive charge
Neutron: in the nucleus of an atom that has no charge
Electron: orbits the nucleus with a negative charge
3. What is a covalent bond? Is it intra or intermolecular? Know the example given
the notes:: - Covalent between two atoms caused by the sharing of electrons
- Intramolecular (inside)
- Within a water molecule
4. What is an ionic bond? Is it intra or intermolecular? Know the example given
in the notes:: - Between two ions due to the attraction of opposite electrical charges
- Intramolecular
1/2
, - Salt (NaCl)
5. What is a hydrogen bond? Is it intra or intermolecular? Know the example
given in the notes:: - Between positive end of one molecule and negative end of another molecule, needs
more than one molecule present
- Intermolecular (between molecules)
- Between H20 molecules
- Weakest bond
6. What are the macromolecules found in cells?: - Proteins
- Nucleic acids
- Lipids
- Carbohydrates
7. What is the building block of a protein?: Amino acids
8. What is the building block of a lipid?: Fatty acids
9. What is the building block of a carbohydrate?: Glucose
10. What is the building block of a nucleic acid?: Nucleotides
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