BSCI207 EXAM 1 CC UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. Organisms are typically open systems. What is an example of something that is not open with regards
exchanging mass?
Answer:
the entire earth
Question:
2. What is the best description of the relationship between autotrophs and heterotrophs?
Answer:
Although an autotroph is relatively self sufficient, it does exchange matter with heterotrophs.
Question:
3. ATP is a great source of energy that enable organisms to do work. What kind(s) of work is it used for?
Answer:
It phosphorylates metabolites to perform chemical work and proteins to perform physical work.
Question:
4. Which scientist first described free energy and had it named after him?
Answer:
Gibbs
Question:
5. When do spontaneous reactions occur?
Answer:
They can happen if the reactants have enough energy to get over any energy barrier.
Question:
6. Enzymes are useful in chemical reactions because...
Answer:
They lower the activation energy for the reaction.
Question:
7. Membranes form spontaneously from phospholipid monomers because bringing the monomers close
together frees up the water molecules that surrounded them. This decreases the entropy of assembly of the
monomers, but increases to a greater extent the entropy of the water molecules.
Answer:
true
Question:
8. What are chaperonins and when are they needed?
, Answer:
Chaperonins may be needed to provide a controlled environment for larger biological structures to
assemble.
Question:
9. What is the trade off that all organisms make to achieve ordered structures for life?
Answer:
Trade organismal order for disorder in their surroundings.
Question:
10. What kind of gene would you want to use to compare humans to chimpanzees?
Answer:
Mitochondrial DNA because it changes quick enough to aquire changes in the 6MY divergence time.
Question:
11. Carl Woese studied the phylogenetic relationships using the rRNA gene because there weren't many
morphological characters that could distinguish different prokaryotic groups.
Answer:
true
Question:
12. What was the amazing discovery made by Carl Woese?
Answer:
That archaens were a unique form of prokaryotes more closely related to eukaryotes than bacteria.
Question:
13. How did Iwabe et al's study differ from that of Carl Woese?
Answer:
B. They compared a different gene that had duplicated for the same organisms.
C. They got a gene tree for each gene copy that was rooted.
Question:
14. When building a phylogenetic tree to show organismal relationships, it is best to use:
Answer:
Genes that undergo vertical gene transfer
Question:
15. Lateral gene transfer likely occurred
Answer:
Frequently in the last universal common ancestral community
Question:
16. The ring of life is a new representation of the idea that
Answer:
The evolution of eukarya from the merger of one archaean and one bacteria
CORRECT ANSWERS
Question:
1. Organisms are typically open systems. What is an example of something that is not open with regards
exchanging mass?
Answer:
the entire earth
Question:
2. What is the best description of the relationship between autotrophs and heterotrophs?
Answer:
Although an autotroph is relatively self sufficient, it does exchange matter with heterotrophs.
Question:
3. ATP is a great source of energy that enable organisms to do work. What kind(s) of work is it used for?
Answer:
It phosphorylates metabolites to perform chemical work and proteins to perform physical work.
Question:
4. Which scientist first described free energy and had it named after him?
Answer:
Gibbs
Question:
5. When do spontaneous reactions occur?
Answer:
They can happen if the reactants have enough energy to get over any energy barrier.
Question:
6. Enzymes are useful in chemical reactions because...
Answer:
They lower the activation energy for the reaction.
Question:
7. Membranes form spontaneously from phospholipid monomers because bringing the monomers close
together frees up the water molecules that surrounded them. This decreases the entropy of assembly of the
monomers, but increases to a greater extent the entropy of the water molecules.
Answer:
true
Question:
8. What are chaperonins and when are they needed?
, Answer:
Chaperonins may be needed to provide a controlled environment for larger biological structures to
assemble.
Question:
9. What is the trade off that all organisms make to achieve ordered structures for life?
Answer:
Trade organismal order for disorder in their surroundings.
Question:
10. What kind of gene would you want to use to compare humans to chimpanzees?
Answer:
Mitochondrial DNA because it changes quick enough to aquire changes in the 6MY divergence time.
Question:
11. Carl Woese studied the phylogenetic relationships using the rRNA gene because there weren't many
morphological characters that could distinguish different prokaryotic groups.
Answer:
true
Question:
12. What was the amazing discovery made by Carl Woese?
Answer:
That archaens were a unique form of prokaryotes more closely related to eukaryotes than bacteria.
Question:
13. How did Iwabe et al's study differ from that of Carl Woese?
Answer:
B. They compared a different gene that had duplicated for the same organisms.
C. They got a gene tree for each gene copy that was rooted.
Question:
14. When building a phylogenetic tree to show organismal relationships, it is best to use:
Answer:
Genes that undergo vertical gene transfer
Question:
15. Lateral gene transfer likely occurred
Answer:
Frequently in the last universal common ancestral community
Question:
16. The ring of life is a new representation of the idea that
Answer:
The evolution of eukarya from the merger of one archaean and one bacteria
