Infection by which of the following begins in lungs and spreads to skin?
a. Blastomyces
b. Coccidioides
c. Histoplasma
d. Mycobacterium
e. Pneumocystis
Answer: a. Blastomyces
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By the process of ____, an organism's tissues store a pollutant taken up from the environment, causing the amount in the body to increase over time
a. pollutant fixation b. biological magnification c. chemical buildup d. pollutant concentration e. bioaccumulation
DNA replication is carried out by which enzyme?
1.RNA polymerase 2.ligase 3.DNA polymerase 4.helicase 5.primase
Stratospheric ozone is important, as it:
a. traps reradiated heat from the earth. b. prevents heat penetration from the sun. c. replenishes the surface ozone layer. d. dissipates the surface ozone layer. e. blocks solar UV radiation.
Beta-N-Methylamino-L-Alanine, or BMAA, is a glutamate receptor agonist produced by cyanobacteria. Since glutamate is an excitatory neurotransmitter, it is not surprising that BMAA is associated with neurological damage. Buildup of BMAA in fruit bats was hypothesized to cause neurodegenerative disease in islanders that fed on the bats. A recent study found high levels of BMAA in sharks, suggesting that consumption of shark fin soup is also dangerous. The researchers suggested that a secondary effect of BMAA may actually make these hazardous foods surprisingly desirable. What might this be?
A. Since BMAA contains alanine, it improves protein synthesis by providing this rare nutrient. B. Since BMAA is derived from cyanobacteria, it provides unique nutrients not found in the animal or plant kingdom. C. Since BMAA is a Glu receptor agonist, it promotes incorporation of Glu into proteins, and has health-promoting effects. D. Since BMAA is a Glu receptor agonist, it imparts a strong umami flavor that makes food more delicious.