practice questions Flashcards
Prostaglandins can be liberated into the circulating blood by the activity of?
adrenaline
________ may be synthesized in the body by essential amino acids.
non-essential amino acids
In Alzheimer diseased patient the B-pleated cheats had a problem. A drug was given that changed the confirmation to a-helix. This happened by changing in what bonds?
hydrogen bonds
The bond in sucrose
α (1→2)
In enzymatic reactions the competitive inhibitor effects:
Km
A fireman was brought to the hospital, He was suffering from a respiratory problem due to the big amount of CO he has inhaled. How does carbon monoxide affect the oxygen dissociation curve?
It moves it to the left
Glucose and galactose are?
epimers
When a Zinc molecule is bounded to an enzyme it is considered to be?
a cofactor
Which amino acid can donate a methyl group?
methionine
A baby had a problem with his collagen fibers due to alteration of one of the amino acids. This amino acid mostly is?
glycine
A child had scurvy disease that resulted from the deficiency of ascorbic acid. This deficiency will affect which step in the synthesis of collagen?
Hydroxylation of proline to hydroxyproline that aid in stabilizing the structure.
A family has inherited cystic fibrosis disease in the family, they wanted to check if their child had this disease, so they asked his pediatric to do sodium chloride sweat test. Cystic fibrosis is associated with:
transmembrane protein
N-glycosylation is associated with ……,
Asn (asparagine)
O-glycosylation happens with…….
Ser (serine)
A baby has multiple fractures and blue sclera is mostly having problem with which of the following?
type I collagen
A Person had an accident and lost a lot of blood, the same amount of lost blood was replaced with distilled water what do you think will happen which of the following describes the condition of the RBCs
The red blood cells will swell because of the hypotonic environment of the blood fluid compared to the cells.
If there is a mutation in 1-fibrilin proteins this disease is:
Marfan syndrome
Which of the following describes the active site of an enzyme?
It is the site of where catalytic reaction takes place
Increasing the substrate concentration will overcome which of the following?
Competitive inhibition
Which of the following describes the change of enzymes in the induce fit theory?
After binding, It changes the shape of the enzyme binding site
The fat is disposed in the body as
Triacylglycerides
All of the Mammalian hormones are made of?
cholesterol
The proteins tertiary structure is stabilized by?
The side chains ( R-groups) interactions
The proteins secondary structure (α-helix, β-bleated sheets) is stabilized by?
hydrogen bonds
What type of bonds connect the sugars in polysaccharides?
glycosidic bonds
Which of the following has 2 alpha and 2 beta polypeptides?
HbA
Denaturation is?
The unfolding of the secondary and tertiary structures of proteins
Integral proteins must be….
Amphipathic
An enzyme works perfectly at an animal stomach, but when it leaves the stomach it loses its activity. This might be due to
Enzyme sensitivity to change in PH
Cephalin is composed of?
Glycerol, fatty acids, phosphate, ethanolamine
Which phospholipid is abundant in nervous tissue?
Sphingomyelin
Cholesterol maintains the cell membrane solubility (permeability) at _______ temperatures
low
What is the precursor of serotonin?
tryptophan
