If the hydrogen ion concentration of ammonia is 0.00000000001 mol/L, then what is its pH value?
a. 1
b. 10
c. -10
d. 11
e. -11
d
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A researcher is studying eukaryotic cells that shows an abnormal pattern of surface glycosylation. The researcher determines that these cells have normal levels of glycolipids and integral membrane proteins with O-linked glycosylation. The researcher discovers that there are no N-linked glycosylated proteins on the cell surface and unusually high levels of glycosylated in the ER membrane. What is a reasonable hypothesis to explain this observation?
A. The cell is defective in synthesizing of carbohydrates B. The cell is defective in assembling carbohydrate trees C. The cell has a defective oligosaccharide transferase D. The cell has a defect in its protein sorting pathway E. The cell has a defect in its ER localization signal
Decapod crustaceans (shrimps, lobsters, and crabs) all lack
A. a carapace, a dorsal cephalothorax shield. B. a ventral line of appendages, swimmerets. C. a tail spine, telson. D. chelicerae.
To best isolate mutant bacteria that are threonine auxotrophs from a larger population, threonine-rich media should be inoculated and any colonies that form are presumptive auxotrophic mutants.
Answer the following statement true (T) or false (F)
All living organisms are part of the natural world because __________.