What organisms are important nitrogen fixers in aquatic ecosystems?
A. diatoms
B. cyanobacteria
C. algae
D. rhizobial fungi
E. symbiotic coral animals
B. cyanobacteria
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A scientist collects a spore from a new species of fungus and observes that this spore has a flagellum. What does the presence of a flagellum suggest about the lifestyle of this species?
A. It is aquatic. B. It is an endomycorrhizal fungus. C. It relies on insects for spore dispersal. D. It is unicellular. E. Its spores are produced asexually.
A scientist looking through a microscope at a piece of shoulder muscle would see which of the following features?
A. striated with unbranched fibers B. striated with branched fibers C. nonstriated with unbranched fibers D. nonstriated with branched fibers E. None of the answers for this question are correct.
You are studying a biochemical pathway. Preliminary results suggest that this pathway is subject to end-product repression. This pathway is therefore most likely to be a(n) ________ pathway.
A) anabolic B) catabolic C) constitutive D) induced E) unregulated
Lupus is a disease in which the immune system produces antibodies that attach to various tissues throughout the body, which initiates massive inflammation and tissue death
What type of disease is this, and what sort of treatment may prove effective?