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Flashcards in Biochemistry Deck (293)
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241

Sodium Cyanide-Nitroprusside test

use to dx Cystinuria (causes urine to turn red-purple)

242

What disease may lead to pellagra?

Hartnup disease:
-aut recessive
-tryptophan excretion in urine and decreased absorption from gut; niacin (vit B3) is derived from tryptophan, so get niacin deficiency --> pellagra = diarrhea, dementia, dermatitis, death

243

In which organs/cells does glycogenolysis occur?

Skeletal muscle: glycogen--> glucose; glucose is rapidly metabolized during exercise

Hepatocytes: glycogen--> glucose to maintain blood sugar at appropriate levels

244

Names of the 4 glycogen storage diseases:

"Very Poor Carbohydrate Metabolism"
1) Von Gierkes - type 1 (glucose-6-phosphatase def)
2) Pompes - type 2 (alpha-1,4-glucosidase = acid maltase def)
3) Coris - type 3 (debranching enzyme = alpha-1,6-glucosidase def)
4) McArdles - type 4 (skeletal muscle glycogen phosphorylase def)

245

cardiomegaly and systemic findings leading to early death (by age 3) - which glycogen storage disease and what enzyme is deficient?

Pompe's = type 2
-lysosomal alpha-1,4-glucosidase (acid maltase)

246

severe fasting hypoglycemia, excessive glycogen in liver, increased blood lactate, hepatomegaly

Von Gierkes (type 1) = Glucose-6-Phosphatase deficiency (so can't do gluconeogenesis or glycogenolysis)

247

mild hypoglycemia, glycogen in liver, hepatomegaly, but normal blood lactate (because gluconeogenesis is intact)

Cori's disease = type 3 = debranching enzyme/alpha-1,6-glucosidase deficiency

248

painful muscle cramps, myoglobinuria with strenuous exercise - what glycogen storage disease?

mcardle's - type 5; skeletal muscle glycogen phosphorylase deficiency
--> have increased glycogen in muscle, but can't break it down.
--> does not affect longevity

249

Which lysosomal storage diseases are X-linked recessive? What are the rest?

Fabry's and Hunter's are X-linked recessive
The rest are Autosomal recessive

250

peripheral neuropathy of hands/feet, angiokeratomas, CV/renal disease, alpha-galactosidase A deficiency, ceramide trihexoside accumulation?

Fabry's disease (XR)

251

hepatosplenomegaly, aseptic necrosis of femur, bone crises, macrophages that look like crumpled tissue paper on microscopy, accumulation of glucocerebroside

Gaucher's disease

252

cherry red spot on macula, foam cells on microscopy, neurodegeneration, hepatosplenomegaly, accumulation of sphingomyelin

Niemann-Pick disease ("No man picks his nose with his sphinger!)

253

cherry red spot on macula, lysosomes with onion skin, neurodegeneration, developmental delay, hexosaminidase A deficiency, GM2 ganglioside accumulation

Tay-Sachs (tay saX lacks heXoaminidase)

254

optic atrophy, globoid cells, neuropathy, development delay, galctocerebroside accumulation

Krabbe's disease

255

ataxia and dementia, central and peripheral demyelination, cerebroside sulfate accumulation

Metachromatic leukodystrophy

256

corneal clouding, airway obstruction, gargoylism, hepatosplenomegaly, development delay; heparan sulfate and dermatan sulfate accumulation

Hurler's syndrome

257

aggressive behavior + mild symptoms of Hurler's syndrome (dev'l delay, gargoylism, airway obstruction, hepatosplenomegaly); heparan sulfate and dermatan sulfate accumulation

Hunter's syndrome (XR)

258

Hypoketotic hypoglycemia (+ weakness and hypotonia)

Carnitine deficiency: can't transport LCFAs into mitochondria, so get toxic accumulation in cytoplasm

259

how many kcal from 1 g protein, carb, fat?

1 g protein --> 4 kcal
1 g carb --> 4 kcal
1 g fat --> 9 kcal

260

LCAT = lecithin-cholesterol acyltransferase: what does it do?

takes cholesterol and puts it into HDL particles (catalyzes esterification of cholesterol)

261

CETP = cholesterol ester transfer protein: what does it do?

allows HDL to deposit cholesterol into LDL, etc.. (mediates transfer of cholesterol esters to other lipoprotein particles)

262

Apolipoprotein E

mediates VLDL and chylomicron remanant uptake by liver cells

263

Apolipoprotein A1

activates LCAT (for cholesterol esterification)

264

Apolipoprotein C-11

lipoprotein lipase cofactor (LPL --> degrades TG circulating in chylomicrons and VLDLs)

265

apolipoprotein B-48

mediates chylomicron secretion by the intestine and chylomicron assembly

266

Apolipoprotein B-100

binds LDL receptor (LDL particle uptake by extrahepatic cells)

267

familial dyslipidemia with increased chylomicrons, increased blood TG and cholesterol; pancreatitis, xanthomas...

type 1: hyper-chylomicronemia
-no increase risk for atherosclerosis

268

familial dyslipidemia with increased LDL; atherosclerosis, Achilles xanthomas, corneal arcus; elevated blood cholesterol

type IIa - familial hypercholesterolemia
-aut dominant
-MI by age 20 if homozygous

269

familial dyslipidemia with increased VLDL; increased blood TGS; pancreatitis

type IV - hypertriglyceridemia
-have hepatic overproduction of VLDL

270

corneal clouding, airway obstruction, gargoylism, hepatosplenomegaly, development delay; heparan sulfate and dermatan sulfate accumulation

Hurler's syndrome