Sample Questions, Exam I Name__________
Multiple Choice: Circle the best answer.
1. The main chemical elements found in biological molecules are:
2. The formation of a peptide bond involves:
3. Simple proteins and DNA are similar in that they both contain
4. ______ are the subunits of nucleic acids and ______
5. The backbone of organic compounds is formed by the chemical
a. involve a sharing of electrons between two atoms
b. form only between two anions or two cations
c. result from the complete transfer of electrons from one atom to another
d. are very weak
e. occur between groups of nonpolar molecules
9. Polyunsaturated fatty acids:
a. contain phosphorous and nitrogen
b. contain several double bonds
c. are solid at room temperature
d. always have an odd number of carbon atoms
10. Atoms of the
same element containing the same number of
11. The amount of energy required to change one gram of liquid
12. Which of the following statements is not true?
13. All of the following except ________ belong to the four families
14. In ______ reactions, small molecules become covalently linked,
17. The helical structure of a polypeptide represents the:
18. The atomic number of an atom is the number of
19. An acid is a
20. Which of the following compounds is not considered a lipid?
Matching: Match the organic molecules appropriately.
Essay: Answer the questions in the space provided. The value of
1. Draw the structure of a triacylglcerol. (6 pts)
2. What is a radioisotope? Give an example. (6 pts)
An isotope in which one of the neutron decays releasing a proton and electron. Tritium.
3. Define an ionic bond. Give a specific example of an ionic bond.
electrons are completely transferred from one atom to another. NaCl.
4. With respect to water, what is adhesion? What is responsible for
Adhesion is water attracted to molecules other than itself. Hydrogen bonding causes this. Explains capillary action, imbibition, and solvent properties of water.
5. Why does water have a high specific heat? (2 pts)
due to hydrogen bonding. Must break hydrogen bonds before
molecules can move faster.
monomer-building blocks of polymers. e.g. amino acids for proteins.
unsaturated fatty acid-missing 2 hydrogens (one double bond). oleic acid.
wax-esters of long chain alcohols and long chain fatty acids. e.g. cutin, suberin.
7. Explain the steps of the scientific method (6 pts).
|be able to explain or recognize all of the terms provided in case 1 (null hypothesis, directional alternative and nondirectiona alternative hypotheses, control and experimental groups, how test for random error, how test for systematic error, prediction, inductive and deductive reasoning, statistical and biological conclusions, Type I error.|