Cyanobacteria, or blue-green algae, are considered the most ancient organisms capable of photosynthesis. Given what you know about cyanobacteria, which of the following is the more similar species?
A. Rickettsia rickettsii; A unicellular intracellular pathogen that infects warm-blooded animals, including humans, causing Rocky Mountain spotted fever.
B. Halobacterium salinarum; A unicellular obligate aerobe that often inhabits hypersaline lakes. This species produces gas vesicles in order to maximize its access to oxygen at the lake's surface.
C. Nitrosolobus multiformis; A unicellular rod-shaped nitrifying bacterium that inhabits subsurface soils at depths associated with plant roots.
D. Nostoc verrucosum; A filamentous species often found in shallow streams and creeks that is capable of fixing atmospheric nitrogen using specialized cells known as heterocytes.
D. Nostoc verrucosum; A filamentous species often found in shallow streams and creeks that is capable of fixing atmospheric nitrogen using specialized cells known as heterocytes.
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Neuromast cells are associated with the ____ of sharks
a. eyes b. lateral line c. nostrils d. brain e. ampullae
The thymus plays an important role in ____
a. secretion of thyroxine b. immune function c. adrenal function d. production of testosterone e. sleep-wake cycles
Following transplant surgery, a patient is given ________ drugs that block the action of the immune response against the transplanted organ
Fill in the blank(s) with correct word
Which of the following is true of transcription in domain Archaea?
A. It involves promoters are identical to those in domain Eukarya. B. There is only one kind of RNA polymerase. C. It produces RNA transcripts that are processed after they leave the nucleus. D. It terminates in a manner similar to that in bacteria. E. It is regulated in the same way as in domain Bacteria.