FINAL 01 - Carbohydrate Metabolism Flashcards
__________ are polyhydroaldehydes or polyhydroxyketones
Carbohydrates
D-glyceraldehyde (Aldose or ketose)
Aldose
D-glucose (Aldose or ketose)
Aldose
Dihydroxyacetone (Aldose or ketose)
Ketose
D-fructose (Aldose or ketose)
Ketose
__________ are bonds that links simple sugar unit to form carbohydrate polymers
Glycosidic bonds
Refers to the sum of all chemical reactions involved in maintaining the dynamic state of a cell or organism
Metabolism
The process of breaking down large nutrient molecules into smaller molecules with the concurrent production of energy
Catabolism
The process of synthesizing larger molecules from smaller ones
Anabolism
Organ responsible for physical digestion
Mouth
In the mouth, the chemical digestion of carbohydrates is done by __________
α-amylase
Organ responsible for absorption of nutrients
Small intestine
In the small intestine, digestion of carbohydrates is done by __________
Pancreatic amylase
In the small intestine, the digestion of proteins is done by __________
Peptidases (ex: trypsin, chymotrypsin, etc.)
In the small intestine, emulsification of lipids is done by __________
Bile acids/salts
In the small intestine, the digestion of fatty acids is done by __________
Lipases
Organ responsible for reabsorption of water and microbiome-assisted synthesis and absorption of vitamins and minerals
Large intestine
In the stomach, digestion and protein denaturation is done by __________
Gastric acid
In the stomach, peptide bonds of proteins are cleaved by __________
Pepsin
The pancreas is responsible for the production of __________ and __________ (AP)
Amylase, Peptides
The pancreas is responsible for the production of two hormones: __________ and __________ (IG)
Insulin, Glucagon
Refers to the process by which glucose is broken down to produce energy
Glycolysis
2 phases of glycolysis (EI, EG)
Energy investment phase, Energy generation phase
Phase that uses 2 ATP molecules to add phosphate groups to glucose, preparing it for breakdown into smaller molecules (Phases of glycolysis)
Energy investment phase
Phase that produces 4 ATP and 2 NADH by breaking down glucose into two molecules of pyruvate (Phases of glycolysis)
Energy generation phase
Substrate (Step 1 - Energy investment phase of glycolysis)
Glucose
Enzyme (Step 1 - Energy investment phase of glycolysis)
Hexokinase
Product (Step 1 - Energy investment phase of glycolysis)
Glucose-6-phosphate
Substrate (Step 2 - Energy investment phase of glycolysis)
Glucose-6-phosphate
Enzyme (Step 2 - Energy investment phase of glycolysis)
Glucosephosphate isomerase
Product (Step 2 - Energy investment phase of glycolysis)
Fructose-6-phosphate
Substrate (Step 3 - Energy investment phase of glycolysis)
Fructose-6-phosphate
Enzyme (Step 3 - Energy investment phase of glycolysis)
Phosphofructokinase
Product (Step 3 - Energy investment phase of glycolysis)
Fructose-1,6-biphosphate
Substrate (Step 4 - Energy investment phase of glycolysis)
Fructose-1,6-biphosphate
Enzyme (Step 4 - Energy investment phase of glycolysis)
Aldolase
2 Products (Step 4 - Energy investment phase of glycolysis) (DD)
Dihydroxyacetone phosphate, D-Glyceraldehyde-3-phosphate
Substrate (Step 5 - Energy investment phase of glycolysis)
Dihydroxyacetone phosphate
Enzyme (Step 5 - Energy investment phase of glycolysis)
Triosephosphate isomerase
Product (Step 5 - Energy investment phase of glycolysis)
D-Glyceraldehyde-3-phosphate
Substrate (Step 6 - Energy generation phase of glycolysis)
Glyceraldehyde-3-phosphate
Enzyme (Step 6 - Energy generation phase of glycolysis)
Glyceraldehyde-3-phosphate dehydrogenase
Product (Step 6 - Energy generation phase of glycolysis)
1,3-biphosphoglycerate
Substrate (Step 7 - Energy generation phase of glycolysis)
1,3-bisphosphoglycerate
Enzyme (Step 7 - Energy generation phase of glycolysis)
Phosphoglycerate kinase
Product (Step 7 - Energy generation phase of glycolysis)
3-Phosphoglycerate
Substrate (Step 8 - Energy generation phase of glycolysis)
3-Phosphoglycerate
Enzyme (Step 8 - Energy generation phase of glycolysis)
Phosphoglyceromutase
Product (Step 8 - Energy generation phase of glycolysis)
2-Phosphoglycerate
Substrate (Step 9 - Energy generation phase of glycolysis)
2-Phosphoglycerate
Enzyme (Step 9 - Energy generation phase of glycolysis)
Enolase
Product (Step 9 - Energy generation phase of glycolysis)
Phosphenolpyruvate (PEP)
Substrate (Step 10 - Energy generation phase of glycolysis)
Phosphoenolpyruvate
Enzyme (Step 10 - Energy generation phase of glycolysis)
Pyruvate kinase
Product (Step 10 - Energy generation phase of glycolysis)
Pyruvate
In anaerobic respiration, __________ is the process that converts pyruvate into lactic acid
Lactic acid fermentation
In anaerobic respiration, __________ is the process that converts pyruvate into ethanol and carbon dioxide
Alcohol fermentation
Refers to the process that happens in the mitochondria wherein acetyl-CoA is oxidized to produce ATP, NADH, FADH2, and CO2
Kreb’s cycle/Tricarboxylic acid cycle
2 substrates (Step 1 - Kreb’s cycle) (OA)
Oxaloacetate, Acetyl-CoA
Enzyme (Step 1 - Kreb’s cycle)
Citrate synthase
2 Products (Step 1 - Kreb’s cycle) (CC)
Citryl-CoA, Citrate
___________, an allosteric enzyme, is inhibited by NADH, ATP, and succinyl-CoA (Step 1 - Kreb’s cycle)
Citrate synthase
2 substrates (Step 2 - Kreb’s cycle) (CC)
Citrate, cis-Aconitate
Enzyme (Step 2 - Kreb’s cycle)
Aconitase
Product (Step 2 - Kreb’s cycle)
Isocitrate
__________ and __________ are achiral; neither has a stereocenter (Step 2 - Kreb’s cycle) (CA)
Citrate, Aconitate
__________ is chiral; it has 2 stereocenters and 4 stereoisomers are possible (Step 2 - Kreb’s cycle)
Isocitrate
Only __________ of the 4 possible stereoisomers is formed in the cycle (Step 2 - Kreb’s cycle)
One (1)
Substrate (Step 3 - Oxidation - Kreb’s cycle)
Isocitrate
Enzyme (Step 3 - Oxidation - Kreb’s cycle)
Isocitrate dehydrogenase
Product (Step 3 - Oxidation - Kreb’s cycle)
Oxalosuccinate
Substrate (Step 3 - Decarboxylation - Kreb’s cycle)
Oxalosuccinate
Product (Step 3 - Decarboxylation - Kreb’s cycle)
α-Ketoglutarate
__________ is an allosteric enzyme; it is inhibited by ATP and NADH and activated by ADP and NAD+ (Step 3 - Kreb’s cycle)
Isocitrate dehydrogenase
Substrate (Step 4 - Kreb’s cycle)
a-Ketoglutarate
Enzyme (Step 4 - Kreb’s cycle)
a-Ketoglutarate dehydrogenase complex
Product (Step 4 - Kreb’s cycle)
Succinyl-CoA
Substrate (Step 5 - Kreb’s cycle)
Succinyl-CoA
Enzyme (Step 5 - Kreb’s cycle)
Succinyl-CoA synthetase
Product (Step 5 - Kreb’s cycle)
Succinate
In the step 5 of the Kreb’s cycle, __________ molecule of GTP is produced
One (1)
Like ATP, __________ stores energy in the form of high-energy phosphoric anhydride bonds (Step 5 - Kreb’s cycle)
GTP
Substrate (Step 6 - Kreb’s cycle)
Succinate
Enzyme (Step 6 - Kreb’s cycle)
Succinate dehydrogenase
Product (Step 6 - Kreb’s cycle)
Fumarate
Substrate (Step 7 - Kreb’s cycle)
Fumarate
Enzyme (Step 7 - Kreb’s cycle)
Fumarase
Product (Step 7 - Kreb’s cycle)
Malate
__________ is chiral and can exist as a pair of enantiomers; it is produced in the cycle as a single stereoisomer (Step 7 - Kreb’s cycle)
Malate
Substrate (Step 8 - Kreb’s cycle)
Malate
Enzyme (Step 8 - Kreb’s cycle)
Malate dehydrogenase
Product (Step 8 - Kreb’s cycle)
Oxaloacetate
__________ can react with acetyl-CoA to start another round of the Kreb’s cycle (Step 8 - Kreb’s cycle)
Oxaloacetate
Refers to the system that transfers electrons through protein complexes in the mitochondrial membrane, generating a protein gradient that powers ATP synthesis
Electron transport system/chain
Refers to the gradient that forms across the mitochondria’s inner membrane as electrons move through the ETC
Proton gradient
Refers to the process by which ATP is produced in the mitochondria using energy from the ETC and the protein gradient
Oxidative phosphorylation
__________ is an enzyme that produces ATP by oxidative phosphorylation
ATP synthase
Refers to a shuttle that transfers electrons from NADH in the cytoplasm to FAD in the mitochondria, allowing NADH to contribute to ATP production by feeding electrons into the ETC
Glycerol-phosphate shuttle
Refers to the shuttle that transfers electrons from NADH in the cytoplasm to NADH in the mitochondria, allowing NADH to enter the ETC for ATP production
Malate-aspartate shuttle
Total energy yield form complete oxidation of glucose from glycolysis to citric acid cycle
32/34 ATP molecules