Biochem Flashcards

1
Q

type I collagen

A
most common (90%)
Bone
Skin
Tendon
dentin
fascia
cornea
late wound repair

defective in osteogenesis imperfecta

type I = bONE

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2
Q

type II collagen

A

Cartilage (including hyaline)
vitreous body
nuclear pulposus

type II = carTWOlage

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3
Q

type III collagen

A

Reticulin - skin, blood vessels, uterus, fetal tissue, granulation tissue

type III = defective in Ehlers-Danlos (threE D)

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4
Q

type IV collagen

A

basement membrane
basal lamina

type IV = under the FLOOR (BM)

defective in Alport synd

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5
Q

ApoA-I

A
LCAT activation (cholesterol esterification)
only in HDL
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6
Q

ApoB-48

A

chylomicron assembly and secretion by intestine to lymphatics
found in chylomicrons + remnants of chylomicrons

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7
Q

ApoB-100

A

LDL particle uptake by extrahepatic cells (BINDS LDL receptor)
found on VLDL, IDL, LDL

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8
Q

ApoC-II

A
LPL activation (cofactor for)
found on chylomicrons, VLDL, HDL
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9
Q

ApoE3 & E4

A

VLDL and chylomicron remnant uptake by liver cells

found on all, EXCEPT LDL!

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10
Q

vimentin

A

CT;

sarcomas

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11
Q

desmin

A

muscle;

rhabdomyosarcoma, leiomyosarcoma

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12
Q

cytokeratin

A

epithelial cells;

carcinomas

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13
Q

GFAP

A

neuroglia (astrocytes, schwann cells, etc.);

astrocytomas, glioblastomas

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14
Q

neurofilaments

A

axons w/in neurons;

neuroblastomas, primitive neuroectodermal tumors

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15
Q

peripherin

A

neurons

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16
Q

nuclear lamins (A,B,C)

A

nuclear envelope structural framework and DNA within

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17
Q

elastin contains which AA?

A

proline + glycine

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18
Q

enzymes that use B1 (thiamine) as cofactor

A

pyruvate dehydrogenase
alpha-ketoglutarate dehydrogenase
transketolase

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19
Q

rate limiting step in purine synth

A

glutamine PRPP amidotransferase

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20
Q

rate-limiting step in pyrimidine synth

A

CPS-II

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21
Q

needed to make pyrimidines

A
carbomyl phosphate (from ATP, CO2, glutamine)
aspartate
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22
Q

needed to make purines

A
glycine
aspartate
glutamine
THF
CO2
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23
Q

causes the positive charge of histones

A

lysine

arginine

24
Q

causes the negative charge of DNA

A

phosphate groups

25
OTC deficiency vs orotic aciduria (Lab finding)?
OTC def - elevated serum ammonia | orotic aciduria - normal serum ammonia
26
eukaryotic DNA polymerase making own primer
alpha
27
eukaryotic DNA polymerase that replicates lagging strand
alpha
28
eukaryotic DNA polymerase that builds leading strand
delta
29
eukaryotic DNA polymerase that repairs DNA
beta
30
eukaryotic DNA polymerase that replicates mitochondrial DNA
gamma
31
prokaryotic DNA polymerase w/ 3'-->5' exonuclease activity
DNA polymerase III
32
function of 3'-->5' exonuclease
proofread - removes/replaces mismatched nucleotides
33
prokaryotic DNA polymerase w/ 5'-->3' exonuclease activity?
DNA polymerase I
34
function of 5'-->3' exonuclease
degrades RNA primer and replaces it w/ DNA
35
most abundant RNA
rRNA
36
longest RNA
mRNA
37
smallest RNA
tRNA
38
what makes rRNA in eukaryotes
RNA polymerase I
39
what makes mRNA in eukaryotes
RNA polymerase II
40
what makes tRNA in eukaryotes
RNA polymerase III
41
what provides the cap for mRNA
S-adenosyl-methionine (SAM) | 7-methylguanosine cap
42
what is the polyadenylatin signal
AAUAAA
43
irreversible enzymes involved in gluconeogenesis
pyruvate carboxylase PEP carboxykinase fructose-1,6-bisphosphatase (rate-limiting) glucose-6-phosphatase
44
rate-limiting enzyme of glycolysis
PFK-1
45
pyruvate dehydrogenase complex requires which 5 cofactors?
``` pyrophosphate (B1, thiamine; TPP) Lipoic acid - inhib by arsenic (see: garlic breath) CoA (B5, pantothenate) FAD (B2, riboflavin) NAD (B3, niacin) ``` "Tender Loving Care (TLC) For Nobody"
46
2 purely ketogenic AA
lysine | leucine
47
possible products of pyruvate
alanine acetyl CoA lactate oxaloacetate
48
2 main nitrogen transporters in blood
alanine | glutamine
49
tissues that use pentose phosphate pathway
lactating mammary glands liver adrenal cortex RBCs
50
BH4 (tetrahydrobiopterin) cofactor in synth of what?
serotonin tyrosine dopa NO
51
4 functions of NADPH
1) synth FA and cholesterol 2) generate ROS 3) protect RBC from ROS damage 4) CYP450 enzymes
52
3 substrates that can undergo substrate level phoshorylation to create high-energy products (ATP or GTP)
- 1,3-BPG - PEP - succinyl-CoA (makes GTP)
53
only step in glycolysis that makes NADH
glyceraldehyde-3-P --> 1,3-BPG
54
highest energy compound of glycolysis
PEP
55
in RBC, NADH needed to do what?
turn Met-Hb to Hb
56
breakdown of malate yields?
increased NADPH --> increased FA synthesis