MB C5 Self Quiz

tokia's version from 2016-04-29 03:58


Question Answer
1. Which of the following is not true about photoautotrophsThey are a subdivision molecules from inorganic molecules
2. PhotoautotrophsUse sunlight and carbon dioxide
ChemoautotrophsUse inorganic chemical reactions for energy production
PhotoheterotrophsUse sunlight as a source of energy and organic compunds as a carbon dioxide
ChemoheterotrophsUse organic compounds for energy production


Question Answer
3. Many microorganisms in this group are infectiouschemoheterotrophs
Many microorganisms in this group can carry out photosynthesisautotrophs
Members of this group usually do not cause diseaseautotrophs
Members of this group carry out the same metabolic processes as a manchemoheterotrophs
Members of this group break down organic compounds to obtain energychemoheterotrophs
Members of this group synthesize organic compounds to obtain energyautotrophs


Question Answer
4. Oxidationloss of electrons
Catabolic reactionbreakdown of nutrients
Anabolic reactionformation of macrmolecules
Reductiongain of electrons
Phosphorylationaddition of phosphate group
5. All of the following statements are true about activation energy (AE) exceptCellular enzymes


Question Answer
6. Define metabolism and distinguish between anabolism and catabolismMetabolism is the sum of all chemical processes carried out by living organisms.A subdivision of metabolism is anabolism which are reactions that require energy to synthesize complex molecules from simpler ones.Catabolism is the other subdivision of metabolism and involve reactions that release energy by breaking complex molecules into simpler ones which in turn can be reused as building blocks
7. Membrane transporttransmembrane carrier proteins (porins)... phosphotransferase system and permeases
Biomuninescenceability of microorganisms to emit light
Movementbuilding a proton gradient for flagellar rotation..gliding and creeping microorganisms
Biosynthesisamphibolic pathways... production of the amino acids tryptophan
8. (t/f)Metabolic pathways rely on many enzymes to synthesize or catabolize substrates to an end product. Within a given metabolic pathway a product can become another enzyme's substrateTrue
9. Which of the following statements about enzyme to synthesize or catabolize substrates to an end product. Whithin given metabolic pathway, a product can become another enzyme's substrateenzymes generally exhibit a high degree of specificity for one particular substrate...enzymes have a region called the active site which provide an area where it can form a loose association with its substrate
10. (t/f)Enzyme cofactors are usually inorganic ions that enhace enzymatic activity by improving the fit between an ezyme and its substrateTrue


Question Answer
11.All of the following statements about competitive and noncompetitive inhibitors and true EXCEPTCompetitive inhibitors are structurally similar to an enzyme's substrate and bind to the enzyme's allosteric site.
12. Which of the following would influence the rate of an enzyme reactionTemperature... pH...Concentration of substrate molecules... concentration of product molecules
13. What is feedback inhibitionWhen an end product accumulates it often binds to and inactivates the first enzyme that catalyzes the first reaction in the is a reversible noncompetitive inhibitions that regulates the rate of many metabolic pathways
14. The principal energy-exchange molecule in living cell isATP
15. Which of the following statements about glycolysis is not trueGlycolysis like fermentation in an aerobic metabolic pathway that reduces glucose transferring the electrons to the coenzyme ATP which in turn passes these electrons to the final electron acceptor an organic molecule
16. Which of the following is a characteristics of fermentationProduces acids gases and alcohol...occurs in the absence of oxygen...starts with the breakdown of pyruvic acid...occurs following glycolysis and produces NAD
17. During aerobic cell respiration most of the enrgy is produced duringElectron transport chain reactions


Question Answer
18. The typical end products of complete aerobic cell respiration are carbon dioxide water andATP
19. Is glycolysis the only metabolic pathway microorganisms have for oxidizing glucose.If not then what are theyNo.There are the pentose phosphate and Entner-Doudoroff pathways
20. How are fats and proteins used for energyFats are hydrolyzed to 3 fatty acids and glycerol.The glycerol is metabolized in glycolysis.Fatty acids are broken down into two-carbon pieces by a metabolic pathway called beta oxidation.This results in the formation of acetyl-CoA which enters the kRebs cycle and is oxidized to obtain additional energy


Question Answer
21. Oxidative phosphorylationEnergy capture in the form of ATP harnessed from a series of redox reactions with oxygen being the final electron acceptor
ChemiosmosisATP production from a proton gradient across the plasma membrane
Flavoproteins...cytochromes and quinonesElectron carriers
Electron transportTransfer of electron to final electron acceptor (oxygen)
22. The end products of photosynthesis in cyanobacteria and plant cells areglucose and oxygen
23. The energy source that drives the photosyntheic reactions in cyanobacteria isLight
24. In the photosynthetic reactions which of the folowing is not trueEnergy is produced in the dark reactions


Question Answer
25. ChemiosmosisATP production from a proton gradient across the plasma membrane
GlycolysisPathway that begins the breakdown of glucose
Electron transport chainFlavoproteins cytochromes and quinones
FermentationAnaerobic pathway that uses an organic final electron acceptor
PhotosymthesisPathway that uses carbon dioxide light and chlorophyll to produce carbohydrates
Krebs cycleAlso is know as the tricarboxylic acid cycle (TCA) or as the citric acid cycle
26. Label parts (a) through (g) of this enzyme(a)Apoenzyme (b)Cofactor (c)Substrate (d)Active site (e)Coenzyme (f)Allosteric site (g)Holoenzyme