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| 1 | |
Which of the following statements is(are) true about the cyanobacteria? |
| | A) | Cyanobacteria carry out photosynthesis. |
| | B) | Cyanobacteria produce methane. |
| | C) | Cyanobacteria produce oxygen gas. |
| | D) | Both 1 and 3 are correct. |
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| 2 | |
Bacteria are responsible for |
| | A) | cycling minerals within the ecosystem. |
| | B) | fixing atmospheric nitrogen. |
| | C) | deadly diseases. |
| | D) | All of the above |
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| 3 | |
Which of the following is not a characteristic of bacterial cells? |
| | A) | Bacterial cells are eukaryotic. |
| | B) | Bacterial cells do not have an organized nucleus. |
| | C) | Bacterial cells have a cell wall. |
| | D) | Bacterial cells have a single strand of DNA. |
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| 4 | |
When exposed to harsh conditions, some bacteria form |
| | A) | capsules. |
| | B) | endospores. |
| | C) | pili. |
| | D) | flagella. |
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| 5 | |
Archae and Eubacteria differ in the structure of their cell walls. |
| | A) | True |
| | B) | False |
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| 6 | |
You might find Archae |
| | A) | in swamps. |
| | B) | in a cow's stomach. |
| | C) | in the Great Salt Lake. |
| | D) | In all of the above |
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| 7 | |
Nitrogen fixation occurs within |
| | A) | heterocysts. |
| | B) | methanogens. |
| | C) | archaebacteria. |
| | D) | thermoacidophiles. |
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| 8 | |
The basic structure of a virus contains |
| | A) | a nucleic acid. |
| | B) | a cell wall. |
| | C) | a protein coat. |
| | D) | Both 1 and 3 |
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| 9 | |
Before life evolved, lightning was one of the sources of energy that drove chemical reactions to form molecules. |
| | A) | True |
| | B) | False |
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| 10 | |
A major difference between prokaryotic and eukaryotic cells is that |
| | A) | most prokaryotes lack a cell wall, while most eukaryotes have one. |
| | B) | all prokaryotes lack a nucleus, while most eukaryotes have one. |
| | C) | all prokaryotes lack a nucleus, while all eukaryotes have one. |
| | D) | only the prokaryotes can reproduce asexually. |
| | E) | Both 1 and 4 |
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| 11 | |
Gram-negative bacteria have what advantage over gram-positive bacteria? |
| | A) | Gram-negative bacteria are better able to survive environmental changes than are gram-positive bacteria. |
| | B) | Gram-negative bacteria are able to survive longer without water than can gram-positive bacteria. |
| | C) | Gram-negative bacteria can metabolize a wider variety of nutritional materials than can gram-positive bacteria. |
| | D) | Gram-negative bacteria are able to resist antibiotics that attack the cell wall while gram-positive bacteria are susceptible to these drugs. |
| | E) | Gram-negative bacteria have longer life cycles than do gram-positive bacteria. |
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| 12 | |
Endospores function to |
| | A) | help the organism survive periods of drought. |
| | B) | transmit genetic information from one bacterium to another. |
| | C) | help the organism survive exposure to high temperatures. |
| | D) | All of the above |
| | E) | Both 1 and 3 |
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| 13 | |
At the end of conjugation, both of the cells involved |
| | A) | form endospores. |
| | B) | perish. |
| | C) | develop organelles. |
| | D) | have a copy of the plasmid DNA. |
| | E) | are able to degrade most antibiotics. |
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| 14 | |
HIV infects which of the following cells? |
| | A) | Suppresser T-cells |
| | B) | CD4+ cells |
| | C) | Neutrophils |
| | D) | Basophils |
| | E) | Platelets |
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| 15 | |
Reverse transcriptase is an enzyme found in HIV that is used to synthesize DNA that matches the virus's RNA. |
| | A) | True |
| | B) | False |
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| 16 | |
Among the most serious of viral diseases is tuberculosis, a disease of the respiratory tract and is a leading cause of death worldwide. |
| | A) | True |
| | B) | False |
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| 17 | |
The _________ virus cannot be considered eradicated, although there have been no new cases since 1970s, as it may be used as a biological weapon. |
| | A) | HIV |
| | B) | ebola |
| | C) | smallpox |
| | D) | SARS |
| | E) | west nile virus |
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| 18 | |
Scientists now suspect that the first macromolecules were |
| | A) | proteins. |
| | B) | DNA. |
| | C) | RNA. |
| | D) | viruses. |
| | E) | bacteria. |
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| 19 | |
Of the three possibilities for the origin of life on this planet, the ________________ explanation[s] is/are the one[s] that can be tested scientifically. |
| | A) | extraterrestrial origin |
| | B) | special creation |
| | C) | evolution |
| | D) | Both 1 and 3 |
| | E) | Both 2 and 3 |
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| 20 | |
Bacteriophages are a diverse group of viruses that attack humans. |
| | A) | True |
| | B) | False |
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