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WorksheetsBiochemistry
Total questions: 46
Worksheet time: 23mins
The macromolecular complex that can be found in the organelle where protein synthesis occurs
glyoxysome
lysosome
ribosome
spherosome
Which of the following is true
Archaebacteria have a layer consisting of peptidoglyyan
Gram posoyibe bacteria have an outer membrane containing lipopolysaccharide
In gram staining, the lipopolysaccharide layer absorbs the primary stains
the thin peptidoglycan layer of gram negative bacteria preferentially absorbs yhe counterstain
which is true about glutamine
Contains three titratable groups
is an acidic amino acid
contains an amide group
Has E as its one letter symbol
Which is true about peptide bond
Has a partial double bond character
it is ionized at physiologic pH
It is cleaved by agents that denature proteins such as organic solvents and high concentration of urea
It occurs most commonly in the cis configuration
Proteins thay degrade damaged proteins or improperly folded proteins by cleaving their peptide bonds are
molecular chaperones
oleosomes
proteosomes
ubiquitins
Which one of the following statement is true about allosteric effectors of hemoglobin
A high concentration lf 2,3 biophosphoglycerate
Carbon monoxide decreases
Oxyhemoglobin and deoxyhemoglobin have same affinity
the binding of carbon dioxide stabilizes the taut conformation
Refers to the enzyme with its cofactor
apoenzyme
coenzyme
holoenzyme
zymogen
Without requiring ATP
Hydrolase
Ligase
Lyase
Transferase
The amount of substrate necessary to allow an enzyme to function at half its maximal velocity is the
Km
reaction rate
specificity
turnover number
The rate of an enzyme cataluzed reactoon was measured using several substrate. the dependencebod reaction velocity on substrate concentration can be best described as
independent of enzyme concentration
a constant fraction of Vmax
equal to Km
directly proportional to the substrate concentration
Certain amino sugars may be composed of
ABO blood group antigens
Ascorbic acid
Cellulose
Glycogen
True about fatty acid
Both oleic and linoleic acids are considered as essential fatty acid
The groups around the double bonds are always in trans configuration
In the endoplasmic reticulum, double bonds are introduced between C9-C10
Only saturated fatty acids can be found in the triglycerides of mammals
Lipids that is synthesized in the lover and contain steroidal backbone
Bile Acid
Gangliosides
Phosphoglycerides
Triacyglycerols
Main source of energy in aerobic cells
Gluxogenolysis
Glycolysis
Krebs Cycle
Oxidative phosphorylation
Which amino acid can only be converted to intermediate of krebs cycle and do not to ketone bodies
Glycine
Isoleucine
Tryptophan
Tyrosine
Why do low levels of ATP cause increased lactate production
Low ATP levels increase phosphofructokinase activity
High ATP levels inhibit conversion of pyruvate
Low ATP levels stimulate conversion of pyruvate
High ATP levels inhibit the activity of glyceraldehyde-3-phosphate dehydrogenase
A patient suffers from pyrubate kinasw deficiency of the red blood cells
How will this disorder affect the patient's hemoglobin
His hemoglobin has an abnormally high affinity for oxygen
His hemoglobin has a normal affinity for oxygen
his hemoglobin has an abnormally low affinity fot oxygen
the is insufficient data to infer the effect in his hemoglobin
Prostaglandings and Thromboxanes probably an inhibitor of what enzyme
Cholesterol esterase
Cyclooxygenase
HMG-CoA reductase
Phospholipase
True about glycolysis
Anaerobic glycolysis produces a net of 6 moles of ATP per mole of glucose
Hexokinase ks an allosteric enzyme that is strongly inhibited by its product
NAD+ is mainky regenerated during aerobic glycolysis through the conversion of pyruvate to lactate
Phosphofructokinase is the major regulatlry enzyme of glycolysis
The removal of extraneous matter from crude drugs is called
Collection
Drying
Garbling
Milling
Is a method of evaluation that involves the use of naked senses
Biologic method
Microscopic method
Organoleptic method
Physical method
The stave of development of plant is referred to as
Ontogeny
Ontology
Phylogeny
Phyllotaxy
Sambong came from what family
Asteraceae
Fabaceae
Myryaceae
Verbanaceae
The biosynthetic precursor of fatty acid
Acetyl CoA
Deoxyxylulose 5-phosphate
Erythrose 4-phospate
Mevalonic acid
Which of the following is/are carrageenan type/s that forms stable helices in solution
A. Iota
B. Kappa
C. Lambda
D. Both A and B are correct
Which is non drying oil
Cotton seed oil
Linseed oil
Olive Oil
Sesame Oil
The number of mg KOH needed to neutralize the free acids in 1g of a substance
Acid Value
Iodine Value
Peroxide Value
Saponification Value
The fallen, decomposed or refused leaves that are allowed to ferment furnish this grade of oil which contains large amounts of free fatty acids
Technical grade oil
Tourmant oil
Extra virgin oil
Virgin oil
Plants of family Lamiaceae secrete volatile oils through glandular structures known as
Lysigenous ducts
Schizogenous ducts
Trichomes
Vittae
The oxidized hydrocarbon portions of volatile oils are called
eleoptene
empyreumatic oil
rectified oil
stereoptene
A volatile oil constituent derived from Shikimic acid pathway
Camphor
Linalool
Menthyl acetate
Methyl salicylate
Are C24 steroids that carry a doublu unsaturated 6-membered lactone ring at the 17-position
Bile acids
Bufadienolides
Cardenolides
Steroidal saponins
Dioscorea sp. belongs to plants that are good sources of this class of glycosides called :
Bile acids
Bufafienolides
Cardenolides
Steroidal saponins
Amygladin in Prunus amygdalus var. amata yields hydrocyanic acid by the action of which enzyme
Bromelain
Emulsin
Myrosin
Rennin
The cyanophore glycoside obtained from bitter almonfs Prunus amygdalus var. amara is :
Amygdalin
Benzaldehyde
D-mandelonitrile
Prunasin
Sinigrin from Brassixa nihra is which typw of glycoside
Anthraquinone glycoside
Cyanophone glycoside
Flavonoid glycoside
Isothiocyanate glycoside
Tannin reds, which are polymeric products of condensed tannins, are called :
Catechol
Ellargic acid
Phlobaphene
Tannic acid
Which is not a pseudotannin?
Chlorogenic acid
Gallic acid
Ipecacuanhic acid
Tannic acid
Which monocot family has reported alkaloidal conteny
Amaryllidaceae
Dioscoreaceae
Iridaceae
Zingiberaceae
Scientific name of talumpay
Atropa belladona
Datura metel
Datura stramonium
Hyoscyamus niger
Camphorated opium tincture used for many years to control diarrhea in children and adults is known as
absinthe
dovers powder
laudanum
paregoric
Alkaloid used for atropine poisoning
Emetine
Eserine
Reserpine
Strychnine
Which is not a balsam
Balsam copaiba
Peru balsam
Sumatra benzoin
Tolu balsam
Amino acid causes a "kink" in a polypeptide and cam be found in B-bends
Alanine
Glutamine
Proline
Tyrosine
The denaturation temperature or melting temperature of DNA is
The temperature which 50% of the length of the DNA is single-stranded
The temperature in which the entire length of the DNA is single-stranded
The temperature in which the N-glycosidic linkages are completely hydrolized
The temlerature in which the sugar-phosphate backbone is completely hydrolyzed
Derived from 5-hydroxyperoxyeicosatetraenoic acid (5-HPETE) and modulate a variety of biologic functions
Ketone bodies
Leukotrienes
Prostaglandins
Steoids
