Epstein-Barr virus has the following characteristics, except
A) It has a 30-50 day incubation period
B) It multiplies and is latent in the parotid gland
C) It is transmitted by direct oral contact and saliva
D) It infects the respiratory epithelium
E) It can be transmitted by contaminated blood transfusions and organ transplants
D) It infects the respiratory epithelium
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You are looking at a sample from the top green layer of a colorful bacterial mat. Using phase contrast and fluorescence microscopy, you see evenly spaced cells in the middle of a filament that are slightly smaller than the others
The smaller cells are not fluorescent, indicating they lack photosystem II, but the rest of the filament is fluorescent. What type of filamentous bacteria are you most likely looking at? A) purple nonsulfur bacteria B) green sulfur bacteria C) Acidobacteria D) Cyanobacteria
Why is it important that the glycerol heads of the cell membrane be facing toward the extracellular and intracellular environment?
a. They are hydrophilic. b. They are hydrophobic. c. They have both hydrophilic and hydrophobic properties. d. They have neither hydrophilic or hydrophobic properties.
Organisms that derive their energy from sunlight are referred to as
A) homotrophs. B) heterotrophs. C) chemoautotrophs. D) photoautotrophs.
Which is a correct pairing of a biome and its characteristics?
A) temperate broadleaf forest—mild winters; scarce rainfall; predominantly dicot vegetation B) chaparral—mild, rainy winters; long, hot, but wet summers C) savanna—long, cold winters; vegetation dominated by conifers D) tundra—very cold winters; only the upper layer of the soil thaws during summer