Some sample questions

1. Proteins are composed of several types amino acids. R-groups can be polar, non-polar, charged, large, or small. If a protein has a dense core of 50 hydrophobic amino acids, what will happen to its shape if it is dropped into a jar of benzene? Why?

 

2. Given: an atom with an atomic number of 12, atomic weight of 36.

        How many electrons are in its innermost shell?

        How many neutrons does it contain in the nucleus?

        How many electrons are in its outermost shell?

        How many protons does it contain in the nucleus?

        How will it react with chlorine (at.#=17)

3. What is the difference between a covalent bond and an ionic bond?

 

 

4. How are the following properties of water essential for life, as we know it?

        Adhesion

        Cohesion

        Resistance to temperature change

        Universal solvent

        Densest at 4C

 

5. Occasionally someone claims to have built a machine that can run forever, producing as much energy as it consumes. This has always been disproved because it violates what law?

 

6. A living organism represents stored energy in the form of chemical compounds. When an organism dies, what happens to this stored energy?

 

7. While science cannot describe "thinking" in physical terms, we can be certain that the process involves the metabolism inside brain cells. With positron emission tomography (PET scan), it is possible to inject short-lived isotopes and image the regions of the brain that have the most active metabolism during various mental activities. However,

A. thought cannot be linked to cell processes because energy is not related to matter.

B. since thoughts can occur over and over, the requirement for a continual input of energy to prevent entropy does not apply to this cell activity.

C. the cellular energy expended in thinking must be less than the chemical bond energy supplied in food to these brain cells.

D. "thinking" is beyond the scope of science to study.

 

  

 

Which bond is most easily broken?

a. hydrogen
b. covalent
c. both the same