39. Which metabolic pathway makes the least contribution to the control of blood glucose levels?
Select one:
a. glycolysis
b. gluconeogenesis
c. glycogen pathways
d. pentose phosphate pathway
e. TCA cycle
In: Biology
Your book has a wonderful term for the coordinated control of glycolysis and gluconeogenesis: reciprocal.
One is stimulated when the other is suppressed. But not only physiological conditions have such effect -- so do individual compounds found in cells.
A key control point in the pathways are the steps catalyzed by phosphofructokinase (in glycolysis) and fructose-1,6-bisphosphatase (in gluconeogenesis). Let's zero in on this spot.
A. Identify 3 compounds that act reciprocally on these two enzymes (inhibiting one and activating the other).
B. Now, explain why the buildup of each of these, in turn, makes sense physiologically. Why, for instance, does it make sense that AMP activates phosphofructokinase and but inhibits fructose-1,6-bisphosphatase? Answer that and then answer a similar question for the other two effector molecules that you identified in part A.
In: Chemistry
|
Metabolic Pathway |
Input |
Output (and where output goes next, if it does) |
|
Glycolysis leading to Respiration (EMP pathway) |
||
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Fermentation |
||
|
Prep-Step |
||
|
Krebs Cycle Aka: Citric Acid Cycle, TCA cycle |
||
|
Electron Transport Chain |
||
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Lipid catabolism (glycerol portion) |
||
|
Lipid catabolism (fatty acid portion) |
||
|
Protein catabolism |
||
|
Photosynthesis (Cyclic Light-Dependent Reactions) |
||
|
Photosynthesis (Noncyclic Light-Dependent reactions) |
||
|
Photosynthesis (Light Independent Reactions) Aka: Calvin-Benson Cycle |
|
Pathway/ metabolite |
Glycolysis |
Prep step |
Krebs |
ETC |
Fermentation |
Calvin-Benson cycle |
|
Glucose 6-Phosphate |
||||||
|
G3P |
||||||
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3-phosphoglyceric acid |
||||||
|
Pyruvic acid |
||||||
|
Acetyl-CoA |
||||||
|
Oxaloacetic acid |
||||||
|
Dihydroxyacetone phosphate (DHAP) |
||||||
|
Ribulose bisphosphate (RuBP) |
In: Biology
1. A temperature sensitive e.coli is discovered that accumulates okazaki fragments and doesnt complete replication when grown at elevated temperatures. Which enzyme and or enzyme function do you suspect has been mutated?
2. Briefly describe the different strategies used by prokaryotes vs. eukaryotes to condense their genome.
In: Biology
1) Explain three main steps in the process of DNA replication. Name the enzyme that goes with each step.
2) In which direction are new nucleotides added during replication?
3) What is the difference between leading and lagging strand?
4) Which enzyme is responsible for "unzipping" the DNA double helix?
In: Biology
Drugs may cause side effects because:
Select one:
A. the receptors may be found in more than one location in the body.
B. the target is an enzyme, and all enzyme targets cause side effects.
C. the drug has been poorly manufactured.
D. Any of the above are possible explanations.
In: Anatomy and Physiology
QUESTION 10: Cerebral palsy involves what type of defects?
QUESTION 11: What is the function of G6P4?
QUESTION 12: Redness and tenderness of skin that becomes widespread, followed by painful blisters, bullae, and sloughing of skin describes which of the following conditions?
QUESTION 13: An adolescent that uses anabolic steroids to increase muscle mass is at risk for developing which type of cancer?
QUESTION 14: Legg-Calvé-Perthes disease is a childhood condition that occurs when blood supply is interrupted to what area?
In: Nursing
1-
The changing or activation of a tRNA molecule includes:
Group of answer choices
the covalent attachment of an amino acid to the 5' terminal adenosine of the tRNA.
the covalent attachment of an amino acid to the 3' terminal cytosine of the tRNA.
the covalent attachment of the carboxyl group of an amino acid to the tRNA.
the covalent attachment of the amino group of an amino acid to the tRNA.
2-
A difference between a Class I and a Class II tRNA synthetase is (select all that apply):
Group of answer choices
the Class I synthetase requires ATP as a cofactor and the Class II does not.
the Class I synthetase reaction requires a transesterification reaction not necessary in the Class II reaction.
the Class II synthetases are typically monomeric, whereas the Class I enzymes frequently function as multimeric protein complexes.
the Class I synthetase uses the 2' OH of the 3' end of the tRNA as a nucleophile and the Class II uses the 3' OH.
3-
What result allowed Dintzis to conclude that proteins are synthesized from the N terminus to C terminus?
Group of answer choices
All peptides produced from the experiment had similar levels of labeled H and C.
The more newly synthesized peptides had greater levels of radiolabeled C.
Reticulocytes only produce a single protein.
The more newly synthesized peptides had greater levels of radiolabeled H.
In: Biology
1-Common commercial acids and bases are aqueous solutions with the following properties: HCl, density 1.19 g/cm3 and 34% solute by mass. Calculate the molality.
2-Common commercial acids and bases are aqueous solutions with the following properties: HCl, density 1.19 g/cm3 and 35% solute by mass. Calculate the mole fraction.
In: Chemistry
a. (3 pts) All Brønsted-Lowry acids contain the hydrogen ion, H+ . True False
b. (3 pts) You can use any acid/conjugate base pair in making a buffer. True False
c. (3 pts) Concentration does not matter for acids/conjugate bases in buffers. True False
In: Chemistry