BI 171 - Second Exam - 2003
Links go to Pertinent Sections of Book
Place the letter of the choice that
best answers the question on the line to the left.
_______ 1. Which have a major use as a place to store energy?
a. DNA and
b. Lipids and proteins
A polyunsaturated lipid
3. Which are effective insulators?
a. Proteins and
b. Sugars and starches
_______ 4. Which situation is associated with hydration shells?
a. Water picked up by paper
b. Sugar dissolved in water
_______ 5. When sugars form polymers, the bonds differ
a. Only in
b. According to the use of the starch
_______ 6. What two functions would the earliest "living" molecules have?
a. Respiration and digestion
b. Reproduction and respiration
_______ 7. Which term is most closely associated with isotopes?
c. Chemical stability
_______ 8. A pH 4 solution is a ______________ than a pH 5 solution.
a. Two times stronger
b. Ten times stronger base
_______ 9. Which would have glycerol as a component?
c. Nucleic acid
What basic feature is based on carbohydrates
in some organisms and
c. Energy usage
_______ 11. The basic "string" inside an amino acid involves
a. Two Carbons and a
b. Three Carbons
_______ 12. Which environment is not considered a possible site for the origins of Life?
Proteins may be properly
strung together in the laboratory, but the final molecules
_______ 14. Respiration processes produce what to act as fuel?
All of the iguanas of the Galapagos
Islands most likely evolved from a small group
b. Founder effect
_______ 16. Which reason explains why ionic bonds are rare in biological systems?
a. They separate in water
17. A spiral, helix structure can be an important molecular arrangement in
a. Lipids and
b. Proteins and starches
18. Lactose intolerance comes from a lack of lactase for digestion - the person lacks
b. Hydrolysis enzymes
Pick NINE questions to answer in the spaces
Select and answer completely any four
of the following questions.
7. Given here is one side (strand) of DNA. Starting with this strand, show:
Other DNA ____________________________________________________________
How many codons are on the starting strand? ___________
Answer as many or as few as you wish. You can't lose points on the rest of the exam by getting these wrong. Partial credit is possible.
Briefly explain why the "snowball" period would have greatly increased competition, leading to rapid evolution. Four Points.
Photosynthesis might have originated as a combination of which two simpler systems? Three Points each.
Give two different vitamins that function in systems that deal with free radicals, for Two Points each.
Whatís happening in atoms along the "bridges" of the Periodic Table? Four Points.
What is a molecular prosthetic group? Four Points.
What happens to sugar molecules that may create aging effects? Four Points.
What cultural feature is common in ethnic groups that tend to be lactose intolerant? Four Points.
Give an example of a function of "Junk DNA." Four Points.