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Carbonic anhydrase: Quiz


Question 1: The CA enzymes found in ________ are divided into four broad subgroups[4], which, in turn consist of several isoforms:
PrimateEven-toed ungulateMammalMammal classification

Question 2: Before this discovery, ________ has generally been thought of as a very toxic heavy metal without biological function.

Question 3: In plants, carbonic anhydrase helps raise the concentration of CO2 within the chloroplast in order to increase the carboxylation rate of the enzyme ________.
Acetoacetate decarboxylasePhosphoenolpyruvate carboxykinaseRuBisCOOrnithine decarboxylase

Question 4: The epsilon class of CAs occurs exclusively in ________ in a few chemolithotrophs and marine cyanobacteria that contain cso-carboxysomes.
Gram-positive bacteriaGram-negative bacteriaBacteriaCorynebacterium

Question 5: Most prokaryotic and plant ________ CAs belong to the beta family.
PlastidCell wallPhotosynthesisChloroplast

Question 6: A zinc ________ in the enzyme is coordinated in three positions by histidine side chains.
Nicotinamide adenine dinucleotideMetalloproteinAdenosine triphosphateCofactor (biochemistry)

Question 7: These families have no significant amino acid sequence similarity and in most cases are thought to be an example of ________.
BirdParallel evolutionConvergent evolutionCountershading

Question 8: A fourth histidine is placed close to the substrate of water and accepts a ________, in an example of general acid-general base catalysis.

Question 9: The delta class of CAs has been described in ________.

Question 10: This is the reaction that integrates CO2 into ________ sugars during photosynthesis, and can use only the CO2 form of carbon, not carbonic acid or bicarbonate.
Total organic carbonWater pollutionOxygenNitrogen

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