5 Written questions
5 Matching questions
- Identify the 4 levels of protein structure.
- Distinguish between an ion and a polar molecule.
- Define electrolyte balance.
- What is the relationship between matter and elements?
- What is a buffer?
- a they are chemicals that resist pH change. They combine with hydrogen ions when these ions are in excess or they donate hydrogen ions when these ions are depleted.
- b Ions: atom or molecule with an electrical charge.
Polar: molecule in which the electrons and protons are not distributed symmetrically.
- c The body regularly gains and loses these electrolytes, but they must be present in certain concentrations, both inside and outside cells, to maintain homeostasis.
- d All matter is composed of fundamental substances.
- e Primary, Secondary, Tertiary, Quaternary
5 Multiple choice questions
- The number of protons equals the number of electrons.
- Each electron shell can hold a limited # of electrons. The maximum number of electrons that each of the 1st three shells can hold for elements of atomic number 18 and under is ...1st shell ( close to the nucleus) 2 e-, second shell 8 e-, third shell 8 e-. More complex atoms may have as many as 18 e- in the 3rd shell.
- fats, phospholipids, and steroids.
- Hydrogen bonding is important to Tertiary & Secondary protein structures.
5 True/False questions
Which elements are most common in the human body? → DNA: molecules store the information for protein synthesis.
RNA: molecules use this information to construct specific protein molecules.
Compare the chemical composition of carbohydrates, lipids, proteins, and nucleic acid. → Carbohydrates: C, H, O
Lipids: C, H, O (often P)
Protein: C, H, O, N, ( often S)
Nucleic acids: C, H, O , N , P
Compare the characteristics of an acid, a base & a salt. → Acid: substance that releases hydrogen ion
Base: substance that release ions that can combine with hydrogen ions
Salt: substance formed by the reaction between and acid and a base.
Explain why some atoms are chemically inert. → Atoms whose outermost electron shells are filled already have stable structures and are chemically inactive.
What is an isotope? → Atoms that gain or lose electrons because electrically charge.