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Chemistry Internship Study Questions Section 1
Enzymes & Cardiac Markers
35
Chemistry
Undergraduate 4
10/23/2015

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Term
Define International Unit of Enzyme Activity
Definition
Amount of Enzyme that produces 1 umol of product/minute under standardized conditions
Term
Given the same reaction time, what effect will a 10 degree rise in temperature have on enzymatic test results?
Definition
Double Results
Term
True or False:
Temperature too HIGH will cause enzymes to denature
Definition
True
Term
True or False:
Temperature too LOW will stop the reaction
Definition
True
Term
Given the same reaction time, what effect will a 10 degree drop in temperature have on enzymatic test results?
Definition
1/2 the results
Term
What is meant by zero order kinetics?
Definition
Substrate is provided in excess
Term
What is the final reaction product of zero order kinetics dependent on?
Definition
Enzyme Concentration
Term
Which enzymes will be falsely elevated if a sample is hemolyzed?
Definition
LD, ACP, ALP, AST
Term
In which enzyme test may hemolysis interfere to cause a falsely DECREASED result?
Definition
Lipase
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Liver Function
Definition
AST, ALT, GGT, LD, ALP
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Cardiac Function
Definition
CK, CKMB, AST
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Pancreatitis
Definition
AMS, LPS
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Skeletal Muscle Injury/Disease
Definition
CK, AST
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Biliary Obstruction
Definition
GGT, ALP
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Bone Disease
Definition
ALP
Term
What Enzyme OR PANEL of Enzymes is commonly used to evaluate the following:
Organophosphate Poisoning
Definition
PCHE
Term
What enzyme is the MOST SENSITIVE indicator of Alcohol Ingestion
Definition
GGT
Term
If a GGT is Normal, and the ALP is Increased, what is the probably organ source?
Definition
Bone
Term
If a ALT is Normal, and the AST is Increased, what is the probably organ source?
Definition
Muscle/Heart
Term
In which Disease are the HIGHEST Levels of AST/ALT Seen?
Definition
Hepatitis
Term
AMI, Liver Disease, Pulmonary Infarction, and Pernicious Anemia will all cause an INCREASE in Which Enzyme?
Definition
LD
Term
Why must a patient's age be considered when interpreting ALP results?
Definition
Adolescents have INCREASED levels due to NORMAL Bone Growth
Term
In what other "normal" condition is an ELEVATED ALP Observed?
Definition
Pregnancy
- produced by the placenta
Term
What is the clinical usefulness for running an Ostase test?
Definition
Bone specific;
Determines response to therapy for osteoporosis in post-menopausal women
Term
What specific assay has REPLACED the ACP for evaluation of possible PROSTATE carcinoma?
Definition
PSA
Term
What legal significance might an ACP level have if detected on a vaginal swab?
Definition
Positive Result is indicative of the presence of seminal fluid
Term
If a specimen for LD cannot be analyzed right away, Why should it NOT be stored in the Fridge?
Definition
It is Cold Labile;
Causes a False Decreased Value
Term
List the order of appearance of Cardiac Markers following an AMI
Definition
1. Myoglobin
2. Troponin I / CKMB
3. Troponin T
Term
Which cardiac marker is MOST SPECIFIC for Cardiac Tissue?
Definition
Troponin
Term
Which cardiac marker is also Markedly Elevated in cases of Skeletal Muscle Trauma?
Definition
Myoglobin
Term
What is the formula for the CK Relative Index?
Definition
(CKMB x 100) / (Total CK)
Term
What info does the CK-Relative Index provide?
Definition
Differentiates CKMB from heart vs CKMB from Muscle
Term
Which cardiac marker is used to diagnose / monitor congestive heart failure?
Definition
BNP
Term
In regards to cardiac testing, what is the purpose of performing hsCRP?
Definition
To predict future coronary events
Term
What is the purpose of measuring N-telopeptide?
Definition
Indicator of bone resorption
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