The sense of smell is unique because it
A. works in conjunction with the sense of taste to produce a combined smell-taste effect.
B. has direct connections to the limbic system and associated emotions.
C. may be associated with vivid memories.
D. All of the choices are correct.
Answer: D
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Although mating in yeast strains leads to sexual reproduction, asexual reproduction by budding predominates when cultured on rich growth medium.
Answer the following statement true (T) or false (F)
You are working in the field with your favorite bacteria species, Bacterium BB. You carry out some experiments with Bacterium BB, and find that it can now degrade toluene and it is pathogenic! What happened?
A. Bacterium BB acquired degradative and virulence plasmids by horizontal gene transfer. B. Bacterium BB picked up fertility and Col-plasmids via conjugation. C. Bacterium BB was exposed to a bacteriophage which is now in its lytic phase. D. Bacterium BB was transformed with a resistance plasmid and a digestive plasmid. E. Bacterium BB sexually reproduced with another strain of bacteria that had both toluene-degrading gene and virulence gene.
What is the purpose of cyclic electron flow?
a. to prevent the formation of NADPH and excessive reactive oxygen species b. to prevent the loss of light energy when the ATP production pathway is saturated c. to ensure that all of the energy harvested by the sun is converted into ATP d. to protect the cell when CO2 is unavailable and the Calvin cycle is not operating e. to increase the net production of ATP in times when CO2 is unavailable
The genome of prokaryotes consists of
a. a single linear DNA molecule. b. a single circular DNA molecule. c. many linear DNA molecules. d. many circular DNA molecules. e. a single DNA molecule that may be circular or linear, depending on the species.