Unit 1
Supplemental Instruction
Iowa State University / Leader: / Breanna King
Course: / BIOL 211 (3)
Instructor: / Dr. Colbert
Date: / 9/15/10
1. A radioactive isotope has a half-life of 1.2 billion years. As measured by the presence of the isotope and its stable decay product, a rock originally contained 10 grams of the radioactive isotope, and now contains 1.25 grams. Approximately how many years old is the rock?
- 1.2 billion years
- 10,000 years
- 4.8 billion years
- 3.6 billion years
2. Fossils that can be used to establish relative dates are most likely to be found in _____.
- Glacial till (i.e. rubble)
- Sedimentary rock
- Igneous rock
- Volcanic archipelagos
3. Single-celled prokaryotes appeared on the Earth approximately ______years ago.
- 1.5 billion years
- 3 billion years
- 150,000 years
- 3 million years
4. What evidence supports the hypothesis that mitochondria and plastids evolved from prokaryotic endosymbionts?
- They have a single circular chromosome similar to bacterial chromosomes
- They have flagella similar to bacterial flagella
- Their ribosomes are more like prokaryotic ribosomes than eukaryotic ribosomes
- Both a and c
5. All the members of which one of the following groups have the greatest number of characteristics in common?
- Class
- Kingdom
- Phylum
- Species
6. Bacterial cells, but not eukaryotic cells possess ______.
- Photosynthetic pigments
- A nucleoid with a circular chromosome
- Membrane-enclosed organelles
- Cell walls
7. Bacteria that use light for their energy source and CO2 for their carbon source are called
- Photoautotrophs
- Photoheterotrophs
- Chemoautotrophs
- Chemoheterotrophs
8. What is the role of heterocytes in a cyanobacterial filament?
- They carry out photosynthesis and nitrogen fixation
- They carry out only nitrogen fixation
- They carry out only photosynthesis
- They oxidize inorganic substances to obtain energy
9. Which group of bacteria is unusual in that they lack peptidoglycan in their cell walls?
- Spirochetes
- Proteobacteria
- Chlamydias
- Gram-Positive bacteria
10. Prokaryotes found inhabiting the Great Salt Lake would be
- Cyanobacteria
- Extreme halophiles
- Extreme Methanogens
- Extreme Thermophiles
11. What supergroup is characterized by thread-like pseudopodia?
- Excavata
- Unikonta
- Rhizaria
- Stramenopiles
12. Which clade of archaea includes most of the extreme thermophiles?
- Euryarchaeota
- Crenarchaeota
- Korarchaeota
- Extremophiles
13. A coenocytic mass is a feature of what group?
- Gymnamoebas
- Plasmodial Slime Molds
- Anabaena
- Green Algae
14. Which of the following is NOT a use of diatomaceous earth?
- Nanotechnology
- Pesticide
- Metal finishes
- Reflective paint
15. The Oedogonium life cycle is considered to be…
- Anisogamous
- Isogamous
- Asexual
- Both a and c
- Both b and c
16. What is the structure illustrated in the picture?
- Coenocytic mass
- Body mass
- Psedupodium
- Sporangia
17. What clade do these two organisms belong to?
- Ciliates
- Cyanobacteria
- Green Algae
- Spirochetes
18. What disease is caused by the organism illustrated?
- Trichomonas
- Chlamydia
- African Sleeping Sickness
- Lyme Disease