total protein & albumin Flashcards
The term “protein” was derived from “______,” meaning _________.
Proteis - first rank of importance
elements that make up proteins
Carbon, Hydrogen, Oxygen, Nitrogen, and Sulfur (CHONS)
element that distinguishes proteins from other macromolecules
Nitrogen
OOO: Element in Proteins
1 Carbon
2 Hydrogen
3 Nitrogen
4 Phosphorus
4
T/F Proteins can only carry a positive charge.
F – Proteins are amphoteric (carry both positive and negative charges)
Proteins are synthesized mainly by the __________ and secreted by its cells into the circulation.
Liver (hepatocytes)
T/F Immunoglobulins are produced by hepatocytes in the liver.
F - produced in lymphatic tissue
basic structural unit of proteins
Amino acids
pH range of proteins
5.5 to 8.0
explain isoelectric point
pH at which a protein has no net charge
if pH is greater than the isoelectric point of a protein, protein will have a ____________?
net negative charge
proteins that catalyze chemical reactions in the body
Enzymes
Proteins help repair body tissues primarily through the help of _________ and enzymes
Cytokines
OOO: Protein Functions
A) Repair body tissues
B) Transport metabolic substances
C) Decrease blood pH
D) Serve as biocatalysts
C) Decrease blood pH
In hemostasis, it acts to form a clot when activated by thrombin.
fibrinogen
examples of proteins that contribute to the structure of cells and tissues
Collagen, elastin, and keratin
Select: Roles of Protein
A) Maintaining acid-base balance
B) Carrying oxygen through the bloodstream
C) Serving as buffers
D) Acting as biocatalysts (enzymes)
ABCD
OOO: Function of proteins
A Repair body tissues
B Aid in digestion of fats
C Transport metabolic substances
D Maintain acid-base balance
B
Three primary functions of proteins in plasma
Maintenance of oncotic pressure
Transport of small molecules
Promoting/inhibiting inflammatory actions
major proteins in plasma that contribute to the electrophoretic pattern
albumin, α1 antitrypsin, α2 macroglobulin,
haptoglobin, β lipoprotein, transferrin, C3 complement, fibrinogen, and immunoglobulins
OOO: Quantitating and fractionating proteins
A Turbidimetry
B Absorption spectrophotometry
C Liquid chromatography
D Dye binding
Liquid chromatography
T/F Proteins contain approximately 60% nitrogen, which is measured to assess levels of total proteins
T
notable method used for assessing nitrogen content in protein
Kjeldahl method
two enzymes that are examples of transaminases found in the body
AST (Aspartate transaminase) and ALT (Alanine transaminase)
OOO: Related enzymes in protein function for diagnostic tests
AST
LDH
Hemoglobin
Alkaline phosphatase
Hgb
T/F Total protein testing can be used to assess the liver’s synthetic function
T
two proteins most frequently analyzed in plasma
Albumin and Globulins
technique that separates proteins based on their migration towards an electric charge
Protein electrophoresis
main types of globulins in plasma, each with distinct roles
Alpha-1, Alpha-2, Beta, and Gamma globulins
main protein that maintains osmotic pressure in the blood
albumin
primary function of albumin
maintains osmotic pressure and transports various substances in the blood
plasma protein fraction that migrates faster than albumin towards the anode in electrophoresis
pre-albumin
t/f Pre-albumin is mainly used to assess the body’s nutritional status
t
what is α1 fetoprotein, and what does elevated levels in adults indicate
principal fetal protein; elevated levels may indicate liver cancer or other malignancies
T/F Alpha-1 lipoprotein transports LDL cholesterol in the blood
HDL
protein in the Alpha-1 group wc is a marker for spina bifida in prenatal testing
a1 fetoprotein
GC globulin transports ____ and binds ____.
vitamin D ; actin
alpha-2 globulin that binds hemoglobin released from red blood cells
haptoglobin
t/f Haptoglobin has three types: Type 1-1, Type 2-1, and Type 2-2.
t
plasma protein deficiency is associated with Wilson’s disease
ceruloplasmin
copper-containing protein and a marker for copper metabolism disorders.
ceruloplasmin
what are the proteins in the beta-globulin fraction primarily involved in
transport of lipids, iron, and immune responses
which beta-globulin protein transports iron in the blood
transferrin
part of the major histocompatibility complex (MHC) and can indicate immune system activity
Beta-2 microglobulin
C-reactive protein (CRP) indicates _____ when elevated
acute inflammation / infection
T/F CRP is part of the beta-globulin fraction and promotes phagocytosis.
t
main role of gamma globulins
function as antibodies, playing a key role in immune defense
most abundant antibody in the blood and provides long-term immunity.
IgG
presence of IgM typically indicates ____
recent / early stage infection
Select: immunoglobulins typically associated with allergic responses
IgG
IgE
IgM
IgA
IgE
T/F IgA is mainly found in secretions such as saliva and mucus, providing local immunity.
T
which immunoglobulin is typically elevated during parasitic infections
IgE
OOO: Alpha-2 globulin group
Haptoglobin
Ceruloplasmin
Albumin
Albumin
immunoglobulin that acts as a receptor on the surface of B cells, involved in initiating immune responses.
IgD
T/F Beta globulin C3 and C4 complement proteins are part of the immune response system.
T
principle behind Kjeldahl method for protein measurement
Digestion of protein and measurement of nitrogen content, assuming an average nitrogen content of 16%
T/F The Kjeldahl method is used frequently in clinical labs because it’s fast and easy.
F - time-consuming and not typically used for routine testing
reference method for protein measurement.
Kjeldahl method
first reaction step in the Kjeldahl method
conversion of nitrogen to ammonia (Kjeldahlization)
T/F refractometry is used for highly precise measurement of urine protein levels
F - not used for urine protein measurement due to excess solutes in relation to protein
what does refractometry measure in protein analysis
refractive index due to solutes in serum
Refractometry is highly accurate for protein levels above ____ but is not used for urine protein measurement.
2.5 g/dL
Name two common errors or interferences in refractometry
Lipemia, hemolysis, azotemia, and icterus
method that uses the formation of a violet-colored chelate for protein measurement
Biuret method
T/F The Biuret method is the most widely used protein analysis method and is recommended by the IFCC
T
In the Biuret reaction, the color intensity ___________ (color) indicates protein concentration.
reddish violet or pink
wavelength used to measure the Biuret reaction in protein analysis
540 nm