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 it’s 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 4°C
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