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Metabolism: Quiz


Question 1: What does the following picture show?

  Simplified version of the steroid synthesis pathway with the intermediates isopentenyl pyrophosphate (IPP), dimethylallyl pyrophosphate (DMAPP), geranyl pyrophosphate (GPP) and squalene shown. Some intermediates are omitted for clarity.
  Santorio Santorio in his steelyard balance, from Ars de statica medicina, first published 1614
  Structure of ATP synthase. The proton channel and rotating stalk are shown in blue and the synthase subunits in red.
  Glucose can exist in both a straight-chain and ring form.

Question 2: [26] In animals these reactions involve complex organic molecules being broken down to simpler molecules, such as ________ and water.
Carbon cycleGreenhouse gasCarbon dioxideCarbon sink

Question 3: It also serves as a carrier of phosphate groups in ________ reactions.
PhosphorylationAmino acidPosttranslational modificationUbiquitin

Question 4: [6] This information is protected by DNA repair mechanisms and propagated through ________.
Primer (molecular biology)DNA replicationReplication forkTelomerase

Question 5: The maintenance of precise gradients across ________ maintains osmotic pressure and pH.
Cell (biology)Vesicle (biology)Cell membraneCell nucleus

Question 6: The polymers ________ and RNA are long chains of nucleotides.

Question 7: [67] These compounds are made by the assembly and modification of ________ units donated from the reactive precursors isopentenyl pyrophosphate and dimethylallyl pyrophosphate.
Coenzyme Q10CholesterolSqualeneIsoprene

Question 8: Fatty acids are made by ________ that polymerize and then reduce acetyl-CoA units.
Fatty acid synthaseMitochondrial trifunctional proteinHADHAHADHB

Question 9: [15] ________ (NADH), a derivative of vitamin B3 (niacin), is an important coenzyme that acts as a hydrogen acceptor.
Cofactor (biochemistry)Nicotinamide adenine dinucleotideAdenosine triphosphateGlutathione

Question 10: What does the following picture show?

  Plant cells (bounded by purple walls) filled with chloroplasts (green), which are the site of photosynthesis
  Evolutionary tree showing the common ancestry of organisms from all three domains of life. Bacteria are colored blue, eukaryotes red, and archaea green. Relative positions of some of the phyla included are shown around the tree.
  A simplified outline of the catabolism of proteins, carbohydrates and fats
  Structure of the coenzyme adenosine triphosphate, a central intermediate in energy metabolism

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