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MCB EXAM 3 QUIZ 11
Terms in this set (11)
Which of the below phyla are not Eubacteria?
Crenarchaeota, Thaumarchaeota, and Euryarchaeota
Which of the following definitions is true of the phrase "photoheterotrophy" ? a. Photoheterotrophy is the ability to live heterotrophically (like in the dark) when normally the organism is a photosynthetic autotroph. b. Photoheterotrophy is the ability to supplement energy needs by harvesting light (like with a rhodopsin), but the organism cannot use CO2 as the sole carbon source. c. Photoheterotrophy is the oxygenic process by which green plants and cyanobacteria harvest light energy, by which light-driven ATP and NADPH production is combined with the conversion of CO2 and H2O to carbohydrates. d. A and B only e. All of the above
Although similar to eukaryotic photosynthetic organisms, cyanobacteria are different because they
do not have chloroplasts
Which of the following best describes cyanobacteria? a. They carry out anoxygenic photosynthesis. b. They carry out oxygenic photosynthesis. c. They all can use H2S as a source of electrons for photosynthesis. d. Their photosynthetic pigments are in chlorosomes.
They carry out oxygenic photosynthesis
All chlorophylls used by photosynthetic prokaryotes absorb light maximally at 680-685 nm.
The chlorosomes of green sulfur bacteria (such as Chlorobaculum, formerly known as Chlorobium) are the most efficient light harvesting complexes found in nature.
Which of the following statements is not true about anoxygenic photosynthesis? a. Does not produce oxygen. b. May use hydrogen sulfide (H2S) as a source of electrons for photosynthesis. c. Water (H2O) is the usual source of electrons for photosynthesis. d. All of the above statements are true of anoxygenic photosynthesis.
Some anoxygenic photosynthetic bacteria use ________ as their electron source. a. hydrogen sulfide (H2S) b. elemental sulfur (So ) c. hydrogen gas (H2) d. All of these choices are correct.
No evidence of horizontal gene transfer of photosynthesis-related genes has been observed among the different phyla of bacteria.
In some species of Cyanobacteria, occasionally heterocysts will be formed. In these heterocysts, _____________is fixed and converted into a usable form like ammonia or nitrate
N2 gas (nitrogen gas)
Refer to the 16S rDNA tree below. Aquificae and Thermotogae are two deeply-branching phyla of Eubacteria. "Deeply branching" means
Being a more ancient form of life
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