Question 1 2 3 4 5 6 7

Short Answer/Essay

2 Points

Question: Explain the difference between facultative and obligate anaerobic respiration.

Answer:

Obligate anaerobes are poisone by oxygen, facultative anaerobes can continue to respire in the absence of oxygen, but can use it to fully oxidize reduced carbon compounds.

Question 1 2 3 4 5 6 7

Multiple Choice

1 Points

Question: The difference between a photoautotroph and a photoheterotroph is that...

Answer:

photoautotrophs are all eukaryotes, while only bacteria exist as photoheterotrophs.
photoheterotrophs use inorganic compounds as their source of energy, but photoautotrophs use light as an energy source.
photoautotrophs convert carbon dioxide into organic compounds, while photoheterotrophs convert organic compounds into other organic compounds.
photoheterotrophs are all archaeans, while only bacteria exist as photoautotrophs.

Question 1 2 3 4 5 6 7

Short Answer/Essay

2 Points

Question: Briefly explain why bacteria are so important to the cycling of nitrogen.

Answer:

Certain Bacteria are the only organisms that can convert N2 into ammonia, which is then further processed by other bacteria into forms usable by eukaryotes.

Question 1 2 3 4 5 6 7

Multiple Choice

1 Points

Question: All thermophiles...

Answer:

are always found in acidic environments.
are all chemoheterotrophs.
are all archaeans.
are found in extremely warm or hot habitats.

Question 1 2 3 4 5 6 7

Short Answer/Essay

2 Points

Question: Is the Kingdom Protista, within the Domain Eukarya, paraphyletic, polyphyletic, or monophyletic? Explain, briefly.

Answer:

Para or poly, depending on to which ancestor one refers.

Question 1 2 3 4 5 6 7

Multiple Choice

1 Points

Question: Endosymbiosis...

Answer:

is thought to have occurred at least three times.
must have lead to a mutual association between two unicellular organisms.
occurred between two prokaryotes over 3 billion years ago.
occurred through infolding of the cell membrane of early eukaryotes.

Question 1 2 3 4 5 6 7

Short Answer/Essay

1 Points

Question: Discuss, briefly, an example of a body plan characteristic that we used to help us organize and classify the diversity of animals. Also, give an example of a trait of that characteristic.

Answer:

Number of tissue layers (2 or 3), symmetry (radial/bilateral), presence of body cavities (coelom, pseudocoelom), cephalization (no or yes).