WorksheetsBiochemistry Quiz
Total questions: 60
Worksheet time: 45mins
It is a visual representation of health hazard, flammability, reactivity and special hazards.
NFPA diamond
GHS
UNECE
WHO
It is a gas or vapor that can cause unconsciousness or death by suffocation due to lack of oxygen.
allergen
asphyxiant
carcinogen
corrosive
It specifies the maximum amount or concentration of a chemical to which a worker may be exposed.
Permissible Exposure Limit (PEL)
Threshold Limit Value (TVL)
Immediate Danger To Life Or Health (IDHL)
Flammability Limit
It is the lowest temperature at which a liquid or solid can produce a vapor sufficient to form an ignitable mixture in the air.
flash point
boiling point
melting point
triple point
Which is an example of a corrosive acid?
H2SO4
NaOH
NO2
KMnO4
When inhaling chemicals, what is the route of exposure?
Gases, vapors, mists, fumes and dusts enter through the nose or mouth.
Liquid and solid chemicals enter the body through the gastrointestinal tract.
Chemicals enter the body when absorbed by the skin
Chemicals enter the body when sharp objects such as used needle and broken glass puncture the skin.
What should you do best if you are unfamiliar with a substance required in your study?
ask the lab personnel or the instructor
proceed with the experiment
look for familiar substances
look it up online
In the hazard identification system, yellow diamond means _________
health hazard
flash point
reactivity
special hazard
What is used to hold or clamp laboratory glassware and other equipment in place, so it does not fall down or come apart?
ring stand
ring clamp
stirring rod
crucible stand
Which is the conjugate acid? HCl + H2O → H3O+ + Cl−
HCl
H2O
H3O+
Cl−
What is the pH of a solution containing a hydronium ion which is 3.2 x 10−4 M?
1.00
-1.00
3.49
-3.49
What is the pH of a buffer solution that is in 1.2M formic acid and 2M sodium formate?The pKa of formic acid is 3.74.
3.96
4.04
4.12
4.24
What type of reaction takes place in Zn + 2HCl → ZnCl2 + H2 ?
synthesis
decomposition
single displacement
double displacement
Zinc metal can react with aqueous NaOH because it can be oxidized in this reaction.What type of reaction is explained?
acid-base reaction
redox reaction
Balance the reaction: Na2CO3 + HCl → NaCl + H2O + CO2
Na2CO3 + HCl → 2NaCl + H2O + CO2
Na2CO3 + 2HCl → 2NaCl + H2O + CO2
Na2CO3 + 2HCl → NaCl + H2O + CO2
Na2CO3 + 2HCl → 2NaCl + H2O + 2CO2
Which substance gives the pink color in an alkaline medium?
Phenolphthalein
Litmus solution
Iodine
Hydrochloric Acid
When compound X is added to the litmus solution, it turns into red.Which of the following is true about compound X?
It is an acid.
It is base.
It is neutral.
It is both an acid and a base.
Consider the following in the solution NaCH3COO + CH3COOH Buffer
1. pH before addition of 0.1M NaOH is 4.73
2. pH after addition of 0.1M NaOH is 4.73.
What is the best conclusion?
buffer solution resist change
buffer solution does not resist change
solution without buffer solution will elicit drastic change in pH
solution with buffer solution will elicit drastic change in pH
Which buffer system operates in the internal fluids of all cells?
Phosphate Buffer System
Protein Buffer System
Carbonate Buffer System
Carbonic Acid Buffer System
Which has a faster diffusion rate?
Warm water + Ink
water + ink
It refers to the net movement of molecules or ions from region of higher concentration to a region of low concentration.
Diffusion
Osmosis
Capillary action
Surface tension
It is present when a membrane separates two different concentrations of molecules.
concentration gradient
osmotic pressure
surfactants
semi-permeable membrane
The higher the concentration, the ______ is the osmotic pressure.
lower
higher
Which process favors the transport of small molecules across a semipermeable membrane from a concentrated solution to a low concentration solution until equilibrium is attained?
diffusion
osmosis
dialysis
surface tension
Which is responsible for surface tension?
cohesive force of water molecule
adhesive force of water molecule
hydrogen bonding
presence of membrane
It is a solution which has a lower solute concentration than the cell.
hypotonic
hypertonic
isotonic
Which of the following statement is true?
Protein is complex/large molecule, it cannot pass through dialysis .
Protein is a simple molecule, it cannot pass through dialysis .
Protein is complex/large molecule, it can pass through dialysis .
Protein is a small molecule, it can pass through dialysis .
Which affects diffusion?
magnitude of concentration difference
size and shape of particles
temperature
all of these
What happens to the surface tension of water if you add a soap?
it decreases
It increases
The solution turns into blue when using a ninhydrin test. What does this indicate?
indicates the presence of alpha amino acid
indicates the presence of secondary amino acid
indicates the presence of aromatic amino acid
indicates the presence of histidine and tyrosine
In Hopkins-Cole test, what indicates the presence of tryptophan?
appearance of purple violet ring
formation of black precipitate
appearance of blue colored spot
solution appears red in color
The solution turns red after Follins McCarthy Sullivan's test. What does this indicate?
indicates the presence of methionine
indicates the presence of arginine
indicates the presence of histidine
indicates the presence of tyrosine
After the Biuret test, the egg albumen turns into blue violet. What does this mean?
protein is present in egg albumin
aromatic amino acid is present in egg albumin
alpha amino acid is present in egg albumin
Tyrosine is present in egg albumin
The gelatin turns blue after the Ninhydrin Test. What does this mean?
protein is present in egg albumin
aromatic amino acid is present in this gelatin dispersion
alpha amino acid is present in gelatin
negative result
What amino acid is shown in the picture?
cysteine
proline
tyrosine
tryptophan
Which test is specific for the detection of tyrosine or histidine?
Hopkins-Cole test
Follins McCarthy Sullivan's test
Pauly's-Diazo test
Millon's Test
What amino acid is shown in the picture?
cysteine
proline
tyrosine
tryptophan
Which test is used to detect amino acids containing an aromatic nucleus?
Biuret test
Xanthoproteic Test
Ninhydrin Test
Millon's Test
What is the only amino acid which has a hydroxybenzene ring?
tyrosine
cysteine
proline
tryptophan
It is the unfolding of the complex secondary, tertiary and quaternary structure of proteins.
precipitation
denaturation
coagulation
How can heat denature the protein in the egg?
by breaking both hydrogen bond and non-polar hydrophobic interactions
by strengthening the hydrogen bond and non-polar hydrophobic interactions
by disrupting the salt bridges held together by ionic charges
by forming the salt bridges held together by ionic charges
What happens when you put an acetone to an egg white?
formation of white/cloudy precipitate
egg white becomes firm
formation of yellow cloudy precipitate
it causes it to be firm
It is a result of interaction between oppositely charged residues that are close to each other to gain electrostatic attraction.
salt bridges
ketone
After you add a lead acetate to an egg albumin, there is a formation of white/cloudy precipitate. Which best explains this phenomena?
Acids and bases are known to denature proteins.
Denaturation caused by heavy metal salt usually leads to an insoluble metal protein salt.
Organic solvent such as lead acetate disrupts the hydrogen bond and displaces the water in the protein.
Lead acetate is capable of altering the tertiary structure of the protein.
It is a result of the unfolding and disorganization of a protein’s secondary and tertiary structure without hydrolysis of the peptide.
Denaturation
Coagulation
Precipitation
Which process is more visible (proteins become solid or semi-solid) and is irreversible?
denaturation
precipitation
coagulation
In xanthoproteic test, the denatured proteins turns into ________.
yellow/orange
blue
purple
red
In the Hopkins-Cole Test, purple ring appears in the coagulated and denatured protein. What does this indicate?
Tryptophan is detected in both coagulated and denatured proteins.
Tryptophan is present even after denaturation and coagulation.
Tryptophan is present in denatured proteins only.
Tryptophan is present in coagulated proteins only.
The denatured proteins turns into ________ after biuret test.
purple
blue
yellow
orange
It is an enzyme that catalyzes the decomposition of hydrogen peroxide to water and oxygen.
catalase
catalyst
amylase
carbohydrase
It refers to the point wherein the amylase has completely hydrolyzed the starch, therefore it no longer gives color in iodine.
Achromic point
Chromic period
Chromic point
At high temperature, the amylase is __________.
deactivated
denatured
reactivated
consumed
When yeast and water is combined, carbon dioxide is not produced. Which of the following is true?
Glucose is present, therefore, this solution lacks the substrate of the reaction.
Glucose is absent, therefore, this solution lacks the substrate of the reaction
Glucose is present, therefore, this solution has the substrate of the reaction
Glucose is absent, therefore, this solution has the substrate of the reaction
What is the role of sulfide in catalase?
Sodium sulfide inhibits catalase because of its sulfide ions.
Sodium sulfide denatures catalase because of its sulfide ions.
Sodium sulfide deactivates catalase because of its sulfide ions.
All of these
It is a heme-containing enzyme that catalyzes the conversion of hydrogen peroxide to oxygen and water.
Catalase
Amylase
Catalyst
Zymase
What enzyme is found in yeast?
Amylase
Zymase
Catalase
Protease
Which catalyzes serves the breakdown of glucose into ethanol and carbon dioxide?
Amylase
Catalase
Zymase
Pancreatin
Which of the following is true about enzymatic activity?
The enzymatic activity increases as it approaches its optimum temperature.
The enzymatic activity decreases as it approaches its optimum temperature.
Which can be a substrate of amylase?
hydrogen peroxide
starch
glucose
water
It refers to any potential source of damage or harm.
hazard
risk
substances
irritant
