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502 practice test
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12.3 Carbohydrates are molecular compounds containing just three elements: Carbon, Oxygen, Nitrogen
- ATrue
- BFalse
22.4 The simple sugar ___________ is a principal source of metabolic energy for the cell.
- Afructose
- Bsacrose
- Cstarch
- Dglucose
32.3 Disaccharide contains
- Aglucose
- Bmaltose
- Cstarch
- Dglycogen
- Efructose
- Fgalactose
- Glactose
- Hsucrose
- Icellulose
42.3 Monosaccharides contains
- Aglucose
- Bmaltose
- Cstarch
- Dglycogen
- Efructose
- Fgalactose
- Glactose
- Hsucrose
- Icellulose
52.5 Select the correct answer for the number of carbons
- A3 carbons are triose, 4 carbons are pentose, 5 carbons are hexose, 6 carbons are tetrose
- B3 carbons are pentose, 4 carbons are hexose, 5 carbons are triose, 6 carbons are tetrose
- C3 carbons are triose, 4 carbons are tetrose, 5 carbons are pentose, 6 carbons are hexose
62.4 monosaccharides are simple sugars that contain only one aldehyde or ketone groups
- ATrue
- BFalse
72.13 Oligosaccharides consist of a few short chains of monosaccharides units joined by ___________ bond
- Ahydrogen
- Bcovalent
- Cionic
- Dphosphodiester
82.22 Asymmetric Carbon is a chiral molecule contains at least one C bonded with
- A4 different groups
- B3 different groups
- Call the same groups
- Ddouble bond
92.25 Enantiomers are chiral molecules that are mirror image
- ATrue
- BFalse
102.27 Which of the following is incorrect
- ASucrose : glucose and Fructose
- BLactose: galactose and glucose
- CMaltose: Glucose and glucose
- DSucrose: Glucose and starch
112.35 In the digestive tract, polysaccharides and disaccharides are converted to monosaccharides by ___________ enzymes that hydrolyze the __________ bond
- AGylcosidases and hydrogen
- BGlycosidases and glycosidic
- Chydrogen and glycosidic
- Dglycosidic and hydrogen
12(3.3) All the following are roles of the Amino Acids EXCEPT:
- Athey may polymerize to form peptide most notably proteins
- Bthey serve as precursors for other small biomolecules
- Cthey may be oxidized to serve as an energy source for the cell
- Dthey serve as transporters of hydrophilic compound in blood
133.3 Amino acids contains two characteristics functional groups:
- Aamino group and carboxylic group
- Bamino group and phosphate group
- Cphosphate group and carboxylic group
14Carboxylic group has a pKa of
- A3
- B6
- C9
- D2
- E1
153.4 amino group has a pKa
- A9
- B2
- C6
- D1
163.6 The formation of a peptide bond between two amino acids is an example of a(n) ______________ reaction.
- Acleavage
- Bcondensation
- Cgroup transfer
- Disomerization
- Eoxidation reduction
173.10 Sulfur group contains which amino acids
- Amethionine and glutamine
- Bmethionine and serine
- Cserine and cysteine
- Dcysteine andmethionine
- Easoargunine and glutamine
183.9 serine and threonine: side chains contain which ______ group
- Ahydroxyl
- Bamide
- Cthiol
193.9 cysteine: side chain containing ______ group
- Ahydroxyl
- Bamide
- Cthiol
203.17 The chirality of an amino acid results from the fact that its carbon:
- Ahas no net charge
- Bis a carboxylic acid
- Cis bonded to four different chemical groups
- Dis in the L absolute configuration in naturally occurring proteins
- Eis symmetric
21Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________
- Aalanine; is a simple methyl group
- Bglycine; is a hydrogen atom
- Cglycine; is unbranched
- Dproline; forms a covalent bond with the amino group
- Elysine; contains only nitrogen
223.18 All of the amino acids that are found in proteins, except for proline, contain a(n):
- Acarbonyl group
- Bamino group
- Cester group
- Dthiol group
23Which of the following statements about cystine is correct?
- ACystine is formed through a peptide linkage between two cysteines. E) Two cystines are released when a —CH2—S—S—CH2— disulfide bridge is reduced to —CH2—SH.
- BCystine forms when the —CH2—SH group is oxidized to form a —CH2—S— S—CH2— disulfide bridge between two cysteines.
- CCystine is formed by the oxidation of the carboxylic acid group on cysteine
- DCystine is an example of a nonstandard amino acid, derived by linking two standard amino acids.
243.26 Isoelectronic point or iso-ionic point is the PH at which the amino acid does not migrate in an electric field, which is the correct equation:
- ApI=1/2(pKa1+pKa2)
- BpI=2(pKa1+pKa2)
- CpI=(pKa1+pKa2)
253.33 Select the classifications for Fibrous protein
- Ado not have a tertiary structure
- Bspherical in shape
- Cdissolve in water to form colloidal solution
- Dlong fibers or sheets in shape
- Einsoluble in water
- Fegg albumin, serum, globulin etc
- Gperform structural functions
- Heg. keratins, collagen, elastin, and fibroin
- Ithe length of polypeptide chain is always identical in two samples of the same globular protein
- Jthe length of polypeptide chain may vary in two samples of the same fibrous protein
263.33 Select the classifications for Globular protein
- Ahave tertiary structure. Quaternary may or may not be present
- Bperform structural functions
- Cspherical in shape
- Dinsoluble in water
- Edissolve in water to form colloidal solution
- Flong fibers or sheet in shape
- Gthe length of polypeptide chain is always identical in two samples of the same globular protein
- Hdo not have a tertiary structure
- Iperforms metabolic functions
- Jegg albumin, serum globulin etc
273.35 Primary Protein is a ________ structure that refers to the sequence of ________ bond along the main chain of polymer
- Ahydrogen, linear
- Blinear, covalently
- Clinear, hydrogen
- D3d, hydrogen
283.35 secondary protein is a repeating pattern of _________ which is an example of ___________.
- Ahydrogen bond, only beta sheet
- Bhydrogen bond, only alpha helix
- Ccovalently bonded, alpha helix and beta sheet
- DHydrogen bond, alpha helix and beta sheet
293.42 What amino acid is called helix breaker?
- AProline is disfavored in an α-helix because its N is part of a cyclic structure, it cannot form appropriate bond angles to fit within α-helix called helix breaker
- Bβ-sheet is formed by 2 or more strands of amino acids; it is a coplanar alignment of backbone atoms
- CHistidine, lysine and arginine are basic aa that carry a nitrogen that can be protonated and positively charged at physiologic and lower pH
303.47 Identify which of the following refers to the arrangements of different protein subunits in a multi-protein complex
- ASecondary structure
- BQuaternary structure
- CPrimary structure
- DTertiary structure
31Unfolding of a protein is called denaturation
- ATrue
- BFalse
323.51 which of the following is not correct about protein unfolding.
- Aunfolding is sometimes reversible for small proteins mostly
- Bdisulfide bridge are important in reestablishing the proper
- Cdenaturation results in gain of function for the protein
333.53 For the unfolding reaction of a protein G , ∆H=216 Kj/mol this means that
- AUnfolding is favored enthalpically
- BThe entropy is positive at all temperature
- CFolding is favored enthalpically
- DThe entropy is negative at all temperature
343.55 Myoglobin is a globular protein composed of a single polypeptide that has one O2 binding site
- ATrue
- BFalse
353.62 Protein turnover
- AIs the process of recycling proteins into their constituent amino acids for reuse by the cell
- BIts is used to eliminate misfolded proteins
- CIts used to regulate the cell cycle by breaking down in a timely fashion
- DIt is used in the immune system to provide the necessary cleavage of foreign antigenic proteins for presentation and recognition by immune system cells
- EAll of the above
363.62 Two main systems used in protein degradation: lysosomal system and ubiquitin multi-subunit enzyme assembly the proteasome
- ATrue
- BFalse
373.63 All are correct for lysosomal system EXCEPT:
- ALysosomes are membrane bound cytoplasmic organelles that form the major degradative compartment in the cell
- BIt degrades proteins, nucleic acids, whole bacteria through endocytosis, autophagy, and chaperone-mediated autophagy
- CLysosomes are extremely acidic (pH=3.8-5) which promotes denaturation of protein and nucleic acids.
- DLysosomes also contain hydrolytic enzymes that are active at high pH
383.68 there are 10 essential amino acids
- ATrue
- BFalse
393. 68 protein are classified based on their structure or function
- ATrue
- BFalse
40[blank_start]System[blank_end] Part of the universe that is of interest, e.g organism or cells surrounding
[blank_start]Kinetic energy[blank_end] Energy of movement
[blank_start]open system[blank_end] a system that can exchange matter/energy with surrounding
[blank_start]closed system[blank_end] A system that cannot exchange matter with surroundings
[blank_start]potential energy[blank_end] Stored energy
[blank_start]isolated system[blank_end] a system that cannot exchange matter/energy with surrounding
[blank_start]electric energy[blank_end] the energy of moving electrons or other charged particles
[blank_start]Heat or thermal energy[blank_end] The energy of the motion of molecules
[blank_start]radiant energy[blank_end] the kinetic energy of photons, or waves of light, and is critical to biology- ASystem
- Bclosed system
- Copen system
- Dradiant energy
- Epotential energy
- FKinetic energy
- Gpotential energy
- Helectric energy
- Iradiant energy
- Jclosed system
- Kopen system
- Lsystem
- Mopen system
- Nsystem
- Okinetic energy
- Pelectric energy
- Qclosed system
- Rpotential energy
- Sisolated system
- Theat or thermal energy
- Uclosed system
- Vsystem
- Wkinetic energy
- Xopen system
- Ypotential energy
- Zisolated energy
- AAheated or thermal energy
- ABpotential energy
- ACsystem
- ADkinetic energy
- AEopen system
- AFisolated system
- AGradiant energy
- AHclosed energy
- AIisolated system
- AJheat or thermal energy
- AKradiant energy
- ALelectric energy
- AMpotential energy
- ANopen system
- AOclosed system
- APelectric energy
- AQkinetic energy
- ARopen system
- ASclosed system
- ATpotential energy
- AUheat or thermal energy
- AVradiant energy
- AWHeat or thermal energy
- AXradiant energy
- AYelectric energy
- AZisolated system
- BApotential energy
- BBkinetic energy
- BCradiant energy
- BDheat or thermal energy
- BEelectric energy
- BFisolated energy
- BGpotential energy
- BHclosed system
- BIkinetic energy
41the highest potential energy is while an object is rolling down the hill.
- ATrue
- BFalse
42The three types of kinetic energy: heat(thermal), Radiant energy, and electric.
- ATrue
- BFalse
43What is potential energy?
- AThe energy an object has due to its motion
- BThe energy an object might have if it existed
- CThe stored energy of an object due to its position or condition
44What is kinetic energy?
- AThe energy an object has due to its motion
- BThe stored energy of an object due to its position or condition
- CThe energy an object might have if it existed
45Concertation gradient is the
- AConcentration of high solute to low solute
- BConcentration of low solute to high solute
46to predict the direction of a chemical energy, measure the potential energy called Free energy or G (Gibbs)
- ATrue
- BFalse
47Which of the following has the most potential energy?
- AA car at the top of a hill
- BA car speeding down the hill
- CA person at the top of a hill
48Can you create or destroy energy?
- Ayes
- Bno
- Cif your Rose youll give it the hand
49Laboratory tests on the urine of a patient identified the presence of methylmalonate (-OOC–CH(CH3)–COO-). Methylmalonate is best described as which one of the following?
- AA strong acid
- BThe conjugate base of a weak acid
- CIt is 100% dissociated at its pKa.
- DIt is a major intracellular buffer.
5042. What is the pH 0.1 M HCl? [blank_start]1.26[blank_end]
- A1.26
51[blank_start]Oxidized[blank_end] the species losing electrons
[blank_start]Redox[blank_end] When one chemical species loses electron and another gains electron
[blank_start]Reduce[blank_end] The species gaining electrons- AOxidized
- Bredox
- Creduce
- DRedox
- Eoxidized
- Freduce
- GReduce
- Hoxidized
- Iredox
52What’s the formula for carbohydrate
- A(CH2O)n
- BCH3(CH2)3-CH3
- CCOOH
536.3 Enzymes are biological catalysts that act to slow down biochemical reaction
- ATrue
- BFalse
546.5 stomach enzymes used to break protein down into peptides. works at very acidic pH(1.5)
- Apepsin
- Blactase
- Ctopoisomerase
- Dhyaluronidase
- Ezymase
556.5 a digestive enzyme that breaks lactose into glucose and galactose. low levels of lactase can result in locatose intolerance
- Apepsin
- Blactase
- Ctopoisomerase
- Dhyaluronidase
- Ezymase
566.5 a family of enzyme that act on the coiled structure of DNA. they cut the DNA to alter the coiled structure.
- Apepsin
- Blactase
- Ctopoisomerase
- Dhyaluronidase
- Ezymase
576.5 a family of enzymes that break down hyaluronic acid and increase tissue permeability
- Apepsin
- Blactase
- Ctopoisomerase
- Dhyaluronidase
- Ezymase
586.5 a naturally occuring enzyme in yeast, widely used in the baking industry to ferment sugar into ethanol and carbon dioxide
- Apepsin
- Blactase
- Ctopoisomerase
- Dhyaluronidase
- Ezymase
59 Enzyme speeds up the reaction by reducing the activation energy (∆G‡) by allowing the binding of the transition state into the active site
- ATrue
- BFalse
606.9 The highest potential energy
- Atransition state
- Breactant
- Cproduct
61Prosthetic groups are [blank_start]tightly[blank_end] bound co-factor and co-enzyme are [blank_start]loosely[blank_end] bound co-factor
- Atightly
- Bloosely
62Enzyme cofactors that bind covalently at the active site of an enzyme are referred to as _________
- Aprosthetic group
- Bapoenzymes
- Cvitamins
- Dco-substrates
636.19 Which of the following statement is not true regarding the active site of an enzyme?
- AAn active site is normally a hollow on the surface of an enzyme
- Ban active site is normally hydrophilic in nature
- Csubstrates fit into active sites and bind to functional groups within the active site
- DAn active site contains amino acids which are important to the binding process and the catalytic mechanism
64 A catalyst can promote product formation during a chemical reaction by _____.
- Abringing reactants together.
- Bpositioning reactants in the correct orientation.
- Cstabilizing the transition state.
- Dlowering the activation energy barrier.
- Eall are correct
65The potential outcome of a reaction is usually influenced by two factors:
- Astability of product
- Brate of product
- Crate of the reaction
66If the reaction is under kinetic control (rate, irreversible conditions) and the major product is that from fastest reaction.
- ATrue
- BFalse
67If the reaction is under thermodynamic control (equilibrium, reversible conditions) and the major product is the more stable system
- ATrue
- BFalse
68stopped at 6-27
- A6-27
- Bok
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- Quiz on 502 practice test, created by Abdullah Saleh on 03/09/2017.
- Author
- Abdullah Saleh
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