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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
The order and sequence of amino acid in a polypeptide determines what protein structure
a. primary
b. secondary
c.tertiary
d. quaternary
A
Amino acids that cannot be synthesized in the organism are called__________.
a. non essential amino acids
b. essential amino acids
c. standard amino acids
d. alpha amino acids
B
Which hormones regulates the level of blood sodium?
a. aldosterone
b. sterol
c. corticosteroid
d. cortisone
A
It is a precursor of vit. A
a. B-carotene
b. retinol
c. retinal
d. opium
A
Which of the following is a precursor of vitamin D?
a. prostaglandin
b. linoleic acid
c. cholesterol
d. aldosterone
D
Which of these class of enzymes introduces double-bond by the removal of hydrogen
a. dehydronegase
b. dehydrolase
c.decarboxylase
d. lipase
D
The ionic property of amino acid is exhibited by its
a. zwitterions form
b. NH2 group
c. COO group
d. positively charged groups
A
All of the following are simple proteins except:
a. glutelins
b. globulins
c. albumins
d. glycoproteins
D
The simplest monosaccharide is
a. erythrose
b. starch
c. glyceraldehydes
d. arabinose
C
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 these
C
Competitive inhibition is a _________________ reaction.
a. reversible
b. irreversible
c. pH ^ temperature dependent
d. none of these
A
In the Seliwanioff's test, the reaction of resorcinol and acid on the sugar forms___________.
a. hydroxymethyl furfural
b. pyranose
c. hydraxine
d. purine
A
In the Seliwanioff's test, the reaction of resorcinol and acid on the sugar forms___________.
a. hydroxymethyl furfural
b. pyranose
c. hydraxine
d. purine
A
It is the type of enzyme inhibition reaction whereby the inhibition competes with the substrate active site.
a. competitive inhibition
b. noncompetitive
c. reversible inhibition
d. incomplete inhibition
A
The following are waxes except:
a. beeswax
b. sperm oil
c. bile acids
d. lanolin
A
The inactive form of enzymes are called ___________.
a. zymogens
b. apoenzymes
c. cofactor
d. both B & C
A
Which of the following amino acids has no alpha amino group?
a. proline
b. hydroxyproline
c. glycine
d. both a and ?
D
An enzyme is a substance which
a. convert heat to energy
b. act as a catalyst
c. change chemically in reaction
d. is not specific in reaction
B
Milk curdling enzyme present in gastric juice of infants:
a. pepsin
b. rennin
c. trypsin
d. maltase
B
Carbohydrates are
a. polyhydroxyaldehydes / polyhydroxyketones
b. polyhydroxy acids
c. hemiacetals
d. polymers of amino acids
A
Insulin is usually classified as:
a. protein
b. enzyme
c. hormone
d. carbohydrates
C
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
It is the organelle which serves as the site of the electron transport chain.
a. mitochondria
b. ribosome
c. nucleus
d. lysosome
A
The end product of the hydrolysis of glycogen is:
a. galactose
b. fructose
c. glucose
d. arabinose
C
Iodine test is a reaction which may be used to identify carbohydrates. The reaction is due to
a. presence of the free aldehyde group
b presence of alcohol group
c. presence of amylose portion
d. presence of glucose
C
Benedict's reagent yield positive result to:
a. monosaccharide only
b. reducing sugars
c. sucrose
d. polysaccharides
B
Hypertonic solutions will cause the cell to:
a. swell
b. shrink
c. burst
d. undergo hemolysis
B
Rancidity of fats maybe due to:
a. oxidation
b. hydrogenation
c. saponification
d. condensation
A
The deficiency of this hormone causes diabetes mellitus:
a. progesterone
b. testosterone
c. insulin
d. glucagons
C
The active proteolytic enzyme in gastric juice is:
a. pepsin
b. trypsin
c. maltase
d. catalase
A
The site of oxidation reaction in electron transport chain is in the
a. nucleus
b. mitochondrion
c. ribosome
d. golgi bodies
B
Protein digestion starts in the
a. mouth
b. stomach
c. intestine
d. pancreas
B
The conversion of an amino acid to sugar is:
a. gluconeogenesis
b. glycolysis
c. glycogenesis
d. glycogenolysis
A
Which of the following is not an amino acid?
a. leucine
b. choline
c. valine
d. glycine
B
When trypsinogen is conoverted into tyrpsin, the enzyme is called:
a. pepsin
b. zymogen
c. enterokinase
d. amylase
C
The protein part of the enzyme molecule is the:
a.apoenzyme
b.coenzyme
c. cofactor
d. holoenzyme
A
Optimum temperature for enzyme activity in the body:
a.40oC
b.60oC
c. 37oC
d 10oC
C
Glucose is stored in the liver, as:
a. galactose
b. glycogen
c. lactose
d. fructose
B
The enzyme confirmation adapts to the incoming substrate in
a. Lock and Key theory
b. glycogenesis
c. competitive inhibition
d. glycogenolysis
B
The process of converting glucose into glycogen is called
a. gluconeogenesis
b. glycogenesis
c. glycolysis
d. glycogenolysis
B
All are pyrimidine bases except:
a. guanine
b.cystocine
c. uracil
d. thymine
A
Glucose, amino acid and fatty acid enter the citric acid cycle by their conversion into:
a. pyruvate
b. acetyl CoA
c. acetoacetyl CoA
d. palmitic acid
B
A hormone which stimulates glycogenesis:
a. insulin
b. glucagons
c. epinephrine
d. vasopressin
A
These are chemicals that are extracted from organism such as bacteria and can inhibit growth or destroy other
microorganisms:
a. antibiotic
b. enzyme
c. hormone
d. vitamins
A
The gland or tissue that regulates the blood glucose level.
a. parathyroid
b. thyroid
c. pancreas
d. adrenal
C
Which vitamin is formed in the body by exposure to ultraviolet Irradiation or sunlight
a. vit. A
b. vit. B
c. vit. C
d. vit. D
D
Excess vit. A & D is stored in the body, but excess vit. C & D is readily excreted. What property shows this?
a. vit C & D are water soluble
b. vit. A & D are fat soluble
c. both a & b
d. none of these
C
A
The vitamin which is used in the prevention of degenerative changes in the central nervous system.
a. vit. A
b. vit. B complex
c. vit. C
d. vit. D
B
It is a model which best explains the enzyme-substrate action
a. lock & key
b. molecular
c. VSEPR
d. Kreb
A
The activation of pepsinogen requires:
a. pepsin
b. NaOH
c. enterokinase
d. HCL
D
DNA is primarily found in the
a. cytosol
b. nucleus/mitochondria
c. cell wall
d. endoplasmic reticulum
B
It is the enzyme which hydrolyzed starch to dextrin and maltose
a. catalase
b. amylase
c. pepsin
d. lactase
B
A synthetic DNA is called
a. replicated DNA
b. plasmid
c. gene
d. recombinant DNA
D
Hydrolysis of ATP is an
a. energy requiring reaction
b. energy producing reaction
c. no energy is involved
d. energy is absorbed
B
Which of the following characteristic of lipid?
a. zwitterions
b. amphiphilic
c. hydrophobic
d. hydrophilic
C
It is a condition that results when sugar level is below normal
a. hypoglycemia
b. hyperglycemia
c. ketonuria
d. uremia
A
An example of globular protein
a. albumin
b. collagen
c. fibrin
d. silk
A
Complimentary base pairs in the DNA double helix are bonded by
a. H-bond
b. ester bond
c. vander waals
d. dipole dipole
A
Which nitrogen base is not found in DNA?
a. thymine
b. cytosine
c. uracil
d. guanine
C
An organic cofactor in an enzyme
a. vitamins
b. coenzymes
c. a & b
d. none of these
C
At what stage of glucose oxidation is most of the energy produced?
a. glycolysis
b. aerobic stage
c. glycogenesiS
d. glycogenolysis
B
The best known building blocks of RNA and DNA are
a. purines
b. pyrimidines
c. fatty acids
d. a and b
D
It is responsible for the storage and transmission of genetic information.
a. adenine
b. RNA
c. DNA
d. nucleic acid
C
Build up of urea in the kidney is called
a. ketonuria
b. glycemia
c. uremia
d. all of these
C
The transfer of genetic information from DNA by the formation of mRNA
a. transcription
b. translation
c.transamination
d. replication
A
What is the end product of electron transport chain?
a. oxygen
b. hydrogen
c. carbon dioxide
d. water
D
The energy producing reaction
a. metabolic
b. catabolic
c. anabolic
d. all of these
B
It is the molecule that directs the activity of the cells
a. DNA
b. RNA
c. nucleoproteins
d. hormones
D
The sugar involved in DNA
a. ribose
b. pentose
c. deoxyribose
d. xylose
C
The common metabolic pathway
a. glycosis
b. beta oxidation
c. Kreb's cycle
d. glucogenesis
C
Rosenheim's test is used to detect the presence of:
a. ethanolamine
b. choline
c. cholesterol
d. glycone moiety
B
Detects the presence of alpha amino acids:
a. Biuret
b. Molisch
c. Ninhydrin
d. Hopkins-cole
C
The process of producing fats from acetyl co-A is called
a. glycolysis
b. lipogenesis
c. glycogenolysis
d. glucogenesis
B
The ff. test reagents to detect the presence of amino acids, execpt:
a. Grignard's
b. Xanthoproteic
c. Millon-Nasse
d. Sakaguchi
A
The condition that lowers the pH of the blood due to starvation is called
a. acidosis
b. alkalosis
c. hyperglycemia
d. glycosuria
A
The substance responsible or the emulsion of fats is
a. HCI
b. bile acids
c. pepsin
d. trypsin
B
Hubl's solution is used to acertain degree of:
a. saturation
b. unsaturation
c. peroxidation
d. acidity
B
IUPAC name of acrolyn
a. pentenal
b. propenal
c. hexanal
d. acetone
B
The positive indication for the presence of glycerol in acrolein test:
a. yellow colored solution
b. black markings on filter
c. silver mirror formed in the test tube
d. play of colors, from blue to shades paper of red
B
Cerebrosides are positive in the ff. tests, except:
a. Molisch
b. Biuret
c. Lassaigne's
d. none of the above
B
Osmic test is used to detect the presence of _______ in lipids:
a. metals
b. prostate groups
c. unsaturated groups
d. glycerol
B
The most sensitive chemical test to detect the presence of glycerol in acrolein test:
a. Liebberman-Burchard
b. Salkowski reaction
b. Formaldehyde-sulfuric acid
d. Colorimetric spectrophotometry
A
The ff. are phospholipids, except:
a. plasmalogen
b. lecithin
c. cephalin
d. choline
D
A mixed triglyceride contains:
a. three similar fatty acids esterified with glycerol
b. two similar fatty acids esterified with glycerol
c. three different fatty acids esterified with glycerol
d. all of the above
C
The central compound found in the structure of sphingolipids:
a. glycerol
b. sphingosine
c. ceramide
d. phosphocholine
C
Lipid whose specific test is the Furter-Meyer test:
a. tocopherol
b. retinol
c. sphingomyelin
d. cerebroside
A
Precipitate of ___________ indicates the presence of phospholipids in the lipid sample:
a. ammonium phosphomolybdate
b. phosphorous periodate
c. phosphorous triiodide
d. phospho-ammonium sulfate complex
A
The ff. are glycolipids except:
a. globosides
b. phosphatides
c. gangliosides
d. cerebrosides
B
The parent compound of phosphoslipids:
a. glycerol
b. phosphatidic acid
c. ethanolamine
d. none of the above
B
A non-pentose sugar which is also positive for Tollen' sphloroglucinol test:
a. galactose
b. glucose
c. fructose
d. cellobiose
D
The reagent present is Molisch test which is responsible for the dehydration reaction:
a. sodium carbonate
b. magnesium stearate
c. sulfuric acid
d. NaOH
C
ID test to detect the presence of glycogen:
a. phloroglucinol
b. molisch
c. iodine
d. seliwanoff
C
The only sugar that readily forms insoluble osazone crystals:
a. lactose
b.sucrose
c. mannose
d. sucrose
C
Important structural material found in the exoskeletons of many lower animals:
a. chnondroitin
b. heparin
c. hyaluronic acid
d. chitin
D
Hydrolysis of osazones produce:
a. phenylhydrazones
b. ozones
c. sugars
d. none of the above
B
General term for a group of polysaccharides present in the primary cell wall:
a. xanthan
b. mucilage
c. pectin
d. carageenan
C
Specific test for galactose, due to the formation of highly insoluble crystals:
a. phenylhydrazine test
b. fermentation
c. mucic acid
d. molisch
C
Type of RNA which serves as template for the amino acid sequence being synthesized:
a. mRNA
b. tRNA
c. rRNA
d. none of the above
A
