Which of the following statements about myoglobin and hemoglobin is not true? My

Question

Which of the following statements about myoglobin and hemoglobin is not true? Myoglobin stores oxygen in muscle and hemoglobin transports oxygen in blood. Both are heme-containing proteins. Myoglobin is a dimmer and hemoglobin is a tetramer. Myoglobin exhibits a hyperbolic oxygen binding curve and hemoglobin exhibits a sigmoid oxygen binding curve. The Hill coefficient for myoglobin is 1 and for hemoglobin is larger than 1 Which of the following terms is the specificity constant of an enzyme? K_m K_cat K_cat/K_m K_m/V_max K_delta In a plot of I/V_0 vs, I/[S], the V_max value is: i/y-intercept y-intercept slope 1/slope Slope/y-intercept Select the statement that is not true about collagen: Collagen has repeated Gly-X-Y left handed helix 4-hydroxyproline is very common in collagen Collage is formed by assembly of right- handed superficial topic helix The cross-linker m collagen is disulfide bond Cartilage contains a lot of coollagen. Which of the following statements about hexokinase is true? The function of hexokinase in both liver and muscle is to catalyze glycolysis for energy production Hexokinase I exists in liver and hexokinase IV exists in muscle. Hexokinase I has much higher K_m than Hexokinase IV

Explanation / Answer

18 . D

19 C .kcat/kM

20 B.y-intercept

21 A

22 A

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Hemoglobin and myoglobin are just somewhat related in essential succession. Albeit most amino acids are diverse between the two groupings, the amino corrosive changes between the two proteins are by and large preservationist. All the more strikingly, the optional structures of myoglobin and the subunits of hemoglobin are practically indistinguishable, as appeared in Figure . Both proteins are to a great extent alphahelical, and the helices fit together correspondingly. One O 2 particle is bound to every protein atom by an arrange covalent attach to an iron iota (Fe(II)) in the heme gather . Heme is a square planar particle containing four pyrrole bunches, whose nitrogens frame facilitate covalent bonds with four of the iron's six accessible positions. One position is utilized to frame a facilitate covalent bond with the side chain of a solitary histidine amino corrosive of the protein, called the proximal histidine. The 6th and last orbital is utilized for oxygen. It is unfilled in the nonoxygenated types of hemoglobin and myoglobin.

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the specificity steady (additionally called motor proficiency is a measure of how effectively a catalyst changes over substrates into items. A correlation of specificity constants can likewise be utilized as a measure of the inclination of a compound for various substrates (i.e., substrate specificity). The higher the specificity steady, the more the catalyst "inclines toward" that substrate.

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A hexokinase is a catalyst that phosphorylates hexoses (six-carbon sugars), framing hexose phosphate. In many life forms, glucose is the most vital substrate of hexokinases, and glucose-6-phosphate is the most critical item. Hexokinase can exchange an inorganic phosphate aggregate from ATP to a substrate.

Hexokinases ought not be mistaken for glucokinase, which is a particular isoform of hexokinase. While different hexokinases are fit for phosphorylating a few hexoses, glucokinase acts with a 50-overlay bring down substrate liking and its exclusive hexose substrate is glucose.Phosphorylation of a hexose, for example, glucose frequently restrains it to various intracellular metabolic procedures, for example, glycolysis or glycogen combination. This is on account of phosphorylated hexoses are charged, and accordingly more hard to transport out of a cell.

In patients with basic fructosuria, digestion system of fructose by hexokinase to fructose-6-phosphate is the essential technique for metabolizing dietary fructose; this pathway is not huge in ordinary people.

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