The inhibition in noncompetitive reaction _________________.
a. competes with the active site of the enzyme
b. binds simultaneously with substrate other than the active site
c. increases the rate of reaction
d. both b and c
b. binds simultaneously with substrate other than the active site
The order and sequence of amino acid in a polypeptide determines what protein structure
a. primary c. tertiary
b. secondary d. quaternary
a. primary
Amino acids that cannot be synthesized in the organism are called__________.
a. non essential amino acids c. standard amino acids
b. essential amino acids d. alpha amino acids
b. essential amino acids
Which hormones regulates the level of blood sodium?
a. aldosterone c. corticosteroid
b. sterol d. cortisone
a. aldosterone
It is a precursor of vit. A
a. B-carotene c. retinal
b. retinol d. opium
a. B-carotene
Which of the following is a precursor of vitamin D?
a. prostaglandin c. cholesterol
b. linoleic acid d. aldosterone
c. cholesterol
Which of these class of enzymes introduces double-bond by the removal of hydrogen
a. dehydronegase c.decarboxylase
b. dehydrolase d. lipase
d. lipase
The ionic property of amino acid is exhibited by its
a. zwitterions form b. NH2 group c. COO group
d. positively charged groups
a. zwitterions form
All of the following are simple proteins except:
a. glutelins c. albumins
b. globulins d. glycoproteins
d. glycoproteins
The simplest monosaccharide is __________________
a. erythrose c. glyceraldehydes
b. starch d. arabinose
c. glyceraldehydes
Denaturation of protein is a result of
a. cleavage of the peptide bond b. formation of H-bond c. breaking of H-bond
d. none of thes
c. breaking of H-bond
Competitive inhibition is a _________________ reaction.
a. reversible b. irreversible c. pH ^ temperature dependent
d. none of these
a. reversible
In the Seliwanioff’s test, the reaction of resorcinol and acid on the sugar forms___________.
a. hydroxymethyl furfural c. hydraxine
b. pyranose d. purine
a. hydroxymethyl furfural
High concentration of neutral salts causes the precipitation of proteins. This is called__________.
a. salting out c. coagulation
b. salting in d. both b & c
a. salting out
It is the type of enzyme inhibition reaction whereby the inhibition competes with the substrate active site.
a. competitive inhibition c. reversible inhibition
b. noncompetitive d. incomplete inhibition
a. competitive inhibition
The following are waxes except:
a. beeswax c. bile acids
b. sperm oil d. lanolin
a. beeswax
The inactive form of enzymes are called ___________.
a. zymogens c. cofactor
b. apoenzymes d. both B & C
a. zymogens
Which of the following amino acids has no alpha amino group?
a. proline c. glycine
b. hydroxyproline d. both a and
d. both a and
An enzyme is a substance which
a. convert heat to energy c. change chemically in reaction b. act as a catalyst
d. is not specific in reaction
b. act as a catalyst
Milk curdling enzyme present in gastric juice of infants:
a. pepsin b. rennin
c. trypsin d. maltase
b. rennin
Carbohydrates are
a. polyhydroxyaldehydes / polyhydroxyketones b. polyhydroxy acids c. hemiacetals
d. polymers of amino acids
a. polyhydroxyaldehydes / polyhydroxyketones
Insulin is usually classified as:
a. protein b. enzyme
c. hormone d. carbohydrates
c. hormone
What amount of glucose is present in the human blood?
a. 60 to 90 mg in 100 ml blood b. 5 to 6 g in 100 ml blood c. 2% of the total human body weight
d. none of these
a. 60 to 90 mg in 100 ml blood b. 5 to 6 g in 100 ml blood
It is the organelle which serves as the site of the electron transport chain.
a. mitochondria b. ribosome
c. nucleus d. lysosome
a. mitochondria
