A potassium ion gradient is set up in insect Malpighian tubules through an active transport process. As a result, potassium concentration is higher in the lumen of the tubules than in hemolymph
How would the potassium gradient affect water movement? A) Water would be forced out of the lumen of the Malpighian tubules through an osmotic gradient.
B) The potassium gradient would have no effect on water movement.
C) There would be a net movement of water into the lumen of the tubules.
D) Water would be conserved, forming a hypertonic solution in the Malpighian tubules.
C
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CAM photosynthesis improves the CO2/H2O exchange ratio because ________
A. the Calvin cycle is active during the day B. organic acids are decarboxylated at night C. organic acids are decarboxylated in daylight D. CO2 capture occurs at night E. CO2 capture and fixation occur in different cells
Characteristics that strongly indicate the presence of pigmented Prevotella or Porphyromonas in a clinical specimen include:
a. yellow-green fluorescence. b. rhizoid margins resembling a "Medusa head" on anaerobic blood agar. c. brick-red fluorescence under long-wavelength ultraviolet (UV) light. d. chartreuse fluorescens.
Why does the process of making biofuels from weeds and other plant matter require additional steps?
a. They contain a higher proportion of cellulose than corn, soy or sugarcane. b. They contain a lower proportion of cellulose than corn, soy or sugarcane. c. They contain a higher proportion of starch than corn, soy or sugarcane. d. They contain a higher proportion of ethanol than corn, soy or sugarcane. e. They contain a lower proportion of ethanol than corn, soy or sugarcane.
In a lichen, ________ produce sugars for the fungal partner
Fill in the blank(s) with correct word