Match column I with column II and selecrt the correct option from · 2020. 1. 7. · Viruses are...

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CELL-THEUNITOFLIFE

ReviseMostImportantQuestionstoCrackNEET2020

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Q-1-13842034

Match column I with column II and selecrt the correct option from

the codes given below.

(A)A-(i),B-(iii),C-(iv),(D-(ii)

(B)A-(i),B-(iii),C-(ii),D-(iv)

(C)A-(iii),B-(i),C-(iv),D-(ii)

(D)A-(i),B-(iv),C-(ii),D-(iii)

ColumnI ColumnIIA. Leeuwenhoke (i) Firstsawanddescribedalivingcell

B. RobertBrown (ii) Presenceofcellwallisuniquetoplantcells

C. Schleiden (iii) Discoveredthenucleus

D. Schwann (iv) Allplantsarecomposedofdifferentkindsofcell

CORRECTANSWER:A

WatchVideoSolutionOnDoubtnutApp

Q-2-16189760

Which one is the largest unicellular organism

(A)Planaria

(B)Volvax

(C)Bluegreenalgae

(D)Yeast

CORRECTANSWER:D

Q-3-23779910

Study of cell structure under microscope is

(A)Cytology

(B)CellBiology

(C)Cytochemistry

(D)Microanatomy

CORRECTANSWER:A

Q-4-13842039

________ are self replicating, extra chromosomal segments of

double stranded circular and naked DNA, present in a bacterial cell.

(A)Plasmids

(B)Nucleoid

(C)Mesosomes

(D)Bacteriophages

CORRECTANSWER:A

Q-5-16189743

T. Schwann and M. Schleiden were

(A)Dutchbiologists

(B)Englishbiologists

(C)Austrainbiologists

(D)Germanbiologists

CORRECTANSWER:D

Q-6-23779961

Who proposed for the first time that cells are totipotent ?

(A)White

(B)Haberlandt

(C)Steward

(D)HalperinandWetherell

CORRECTANSWER:B

Q-7-13842048

The type of ribosomes found in prokaryotes is

(A)80Stype

(B)70Stype

(C)30Stype

(D)50Stype

CORRECTANSWER:B

SOLUTION:

Thjecytoplasmicribosomesofprokaryotes(bluegreen

algae,bacteriaandPPLOs)are70S.Theyhavetwo

subunits50Sand30S.

Q-8-24359724

Number of membrane(s) seperating intrathylakoid space from

cytoplasm is

CORRECTANSWER:B

SOLUTION:

Numberofmembrancesseperatingintrathylakoidspace

(lumen)fromcytoplasmare3.

Q-9-16189795

Desmosomes are concerned with

(A)Celldivision

(B)Cellularexcreation

(C)Cytolysis

(D)Celladherence

CORRECTANSWER:D

Q-10-13842031

The figures of cork cells as seen by Robert Hooke were published in

the book

(A)Originofspecies

(B)Speciesplantarum

(C)Generaplantrum

(D)Micrographia.

CORRECTANSWER:D

Q-11-16189744

Who proposed the theory that "cells arise only from the pre-existing

cells"

(A)Mohl

(B)Virchow

(C)Hacekel

(D)Brown

CORRECTANSWER:B

SOLUTION:

Virchowgave'Omniscellulaacellula'theory.

Q-12-13842029

The most likely method, used to determine the structural details of a

cell organelle is

(A)autoradiography

(B)microdissection

(C)electronmicroscopy

(D)phasecontrastmicroscopy.

CORRECTANSWER:C

SOLUTION:

Electronmicroscopeisthebestdevicetodetermine

thwestructuraldetailsofacell.Ifcanmagnifyobjects

upto250,000-400,000times.Itsresolvingpoweris

1000timesmorethanthelightmicroscope.This

resolutionisbecauseoflowwavelength of

electronbeamusedaslightsource.Electronmicroscope

iosmadeupofelectromagneticlenses.Thebeamof

(0.005nm)

el,ectronsisfocussedontheobjectswiththehelpofa

condenserlensandamagnifiedimageisfurther

magnifiedbyaprojectorlensandfinalimageis

producedonfluorescentscreen.

Q-13-23779924

Who proposed the "Cell theory"

(A)Schwann

(B)Schleiden

(C)Swanson

(D)Jenssen

CORRECTANSWER:B

Q-14-16189735

Pure fractions of cellular components can be isolated by

(A)Chromatography

(B)Scanningelectronmicroscopy

(C)X-raydiffraction

(D)Differentialcentrifugation

CORRECTANSWER:D

SOLUTION:

Differentialcentrifugation:Itisamechanicalsepartionof

individualsubcelluarcomponentfromhomogenatein

centrifugeatdifferentlowspeeds.Large/heavy/denser

particlessettledownfirstatlowerspeedswhilethe

lighter/smaller/lessdenserparticlesdosoathigher

speedsincentrifuge.

Q-15-13842051

Polyribosomes are aggregation of

(A)ribosomesandrRNA

(B)peroxisomes

(C)severalribosomesheldtogetherbyastringofmRNA

(D)rRNA.

CORRECTANSWER:C

SOLUTION:

Ribosomesmayoccursinglyasmonosomesorin

rosettesandhelicalgroupscalledpolyribosomes.The

differentribosomesareformedduringperiodsofactive

proteinsynthesiswhenanumberofcopiesofthesame

polypeptidearerequired.

Q-16-23779980

Functionally important dead cells are

(A)Corkcells

(B)Trachearyelements

(C)BothAandB

(D)Endothelialcells

CORRECTANSWER:C

Q-17-13842221

Amitosis usually occurs in

(A)eukaryoticcells

(B)prokaryoticcells

(C)meristems

(D)sporemothercells.

CORRECTANSWER:B

SOLUTION:

Amitosisisamethodofdirectcelldivisioninwhichthe

nucleusdividesintotwodaughternucleiwithoutshowing

differentiationofchromosomesanddevelopmentof

spindle.Itiscommonlyseeninprokaryotes.

Q-18-13842113

Which of the following represents the features of lysosomes ?

(A)AlowerpHthanthecytoplasm

(B)Redusedhydrolaseactivity

(C)Doublemembraneenvelope

(D)Allofthese

CORRECTANSWER:A

SOLUTION:

LysosomalenzymesfunctioninacidicmediumorpH

.ThispHislowerthanthatofcytoplasm.

Q-19-23780028

Protoplasm is a

(A)Emulsion

(B)Complexcolloidalsolution

(C)Molecularsolution

(D)Suspension

CORRECTANSWER:B

Q-20-13842119

Which of the following statements regarding sphaerosomes is not

correct ?

(A)Abundantintheendospermcellsofoilseeds

(B)Boundedbyasinglemembrane

(C)Takepartinsynthesisandstorageoflipids

(D)Takepartinphotorespiration

CORRECTANSWER:D

SOLUTION:

Sphaerosomesaresmallcellorganellsboundedby

singlemembranewhichtakepartinstorageand

synthesisoflipids.Sphaerosomesoccurabundantlyin

theendospermcellsofoilseeds.Chloroplast,

peroxisomeandmitochondriatakepartin

photorespiration.

Q-21-13842111

Lysosomes are the reservoirs (store houses) of

(A)hydrolyticenzymes

(B)oxidativeenzymes

(C)secretoryglycoproteins

(D)RNAandproteins.

CORRECTANSWER:A

SOLUTION:

Lysosomesstorethehydrolysingenzymesofthecell.

Theimportantenzymesareacidphosphatases,

sulphatasesproteases,peptidases,nucleases,lipases

andglycosidases.

Q-22-16189738

Which of the following is the exception of cell theory

(A)Bacteria

(B)Fungi

(C)Lichen

(D)Virus

CORRECTANSWER:D

SOLUTION:

Virusesarenotapplicabletocelltheory.Theyaremade

upofproteinsandoneofnucleicacidsi.e.,DNAorRNA.

Sotheylackprotoplasm,theessentialpartofthecell.

Q-23-23779955

Cells which lose their nucleus during differentiation are

(A)Nervecells

(B)Musclecells

(C)Erthrocytes

(D)Leucocytes

CORRECTANSWER:C

Q-24-13842084

Continuity of cytoplasm from cell is maintained through

cytoplasmic connection in plants called

(B)tightjunction

(C)gapjunction

(D)plasmodesmata.

CORRECTANSWER:D

SOLUTION:

Plasmodesmataarecytoplasmicbridgesbetween

adjacentplantcellswhichdevelopinminuteporesof

theirwalls.Theyformaprotoplasmiccontinuumcalled

symplast.Itprovideschannelsforcontrolledpassageof

smallsizedparticlesbetweenadjacentcellsaswellas

transferofsomespecificsignals.

Q-25-16189761

Smallest known cell is

(A)Acetabularia

(B)Nostoc

(C)Chlamydomonas

(D)Pleuropneumonialikeorganism

CORRECTANSWER:D

SOLUTION:

Pleuro-pneumonialikeorganism(PPLO),Mycoplasma

gallisepticumishavinganaveragesizeof .

Q-26-23780020

70S type of ribosome shows two units whose sedimentation

constants are

" " Or

Sub unit in prokaryotic ribosome is

0.150μ

(A)Sedimentationcoefficient

(B)Solubility

(C)Surfacearea

(D)Size

CORRECTANSWER:A

Q-27-13842073

Who gave the lamellar or sandwich model of cell membrane ?

(A)SingerandNicolson

(B)DanielliandDavson

(C)J.Robertson

(D)Noneofthese

CORRECTANSWER:B

SOLUTION:

In1935,DanielliandDavsonproposedthatcell

membraneismadeofadoublelayerofphospholipid

moleculessandwichedbetweentwosinglelayersof

proteins.Thethreelayersareheldtogetherby

electrostaticforceswhilephospholipidlayersarekept

adheredbyvanderWaal'sforces.

Q-28-16189736

Scientists were able to pinpoint the location of colour processing

centres in the visual cortex of the brain by means of

(A)PET

(B)NMR

(D)X-ray

CORRECTANSWER:A

Q-29-23779936

Distinction of individual cells is absent in coenocytic organism

(A)Ultothrix

(B)Volvox

(C)Eshcerichia

(D)Rhizopus

CORRECTANSWER:D

Q-30-13842033

Omnis cellula-e cellula' i.e., new cells arise from prexisting cells ,

this statement was given by

(A)SchleidenandSchwann

(B)RudolfVirchow

(C)RobertBrown

(D)RobertHooke.

CORRECTANSWER:B

SOLUTION:

RudolfVirchowmodifiedthecelltheoryandgavethe

conceptof'omniscellula-ecellula'-meansnewcells

developbydivisionofthepre-existingcells.Thisis

calledtheoryofcelllineageorcommonancestry.

Q-31-23780001

The term protoplasm was coined by

(A)Corti

(B)Dujardin

(C)Purkinje

(D)Dutrochet

CORRECTANSWER:C

Q-32-13842124

In which of the following parts of mitochondria succinic

dehydrogenase enzyme is located ?

(A)Perimitochondrialspace

(B)Outermembrane

(C)Matrix

(D)Innermembrane

CORRECTANSWER:D

SOLUTION:

Succinatedehydrogenaseisanenzymecomplex

involvedinTCAcycle,locatedininnermitochondrial

membrane.

Q-33-16189751

Which one of the following pairs is not correctly matched

(A)Cristae""The"Shelves"formedbythefoldingofthe

innermembraneofthemitochondrion

(B)Plasmodesmata""Themembranesurroundingthe

vacuoleinplants

(C)Grann""Membranebounddiscsinchloroplaststhat

containchlorophyllsandcarrotenoids

(D)Middlelamella""Layerbetweenadjacentcellwalls

inplantsderivedfromcellplate

CORRECTANSWER:B

SOLUTION:

Becausethemembranewhichsurroundsthevacuoleis

knownastonoplast.

Q-34-13842055

According to unit membrane structure, the thickness of plasma

membrane is about

CORRECTANSWER:C

SOLUTION:

AccordingtoRobertson'sconceptofunitmembrane,the

cellmembraneistrilaminar.Ithasathicknessofabout

withacentrallipidlayerof thcikandtwo

35 �

20 �

75 �

100 �

peripheralproteinlayersof each.

Q-35-16189768

Middle lamella is made up of

(A)Cellulose

(B)Suberin

(C)Calciumandmagnesiumpectate

(D)Lignin

CORRECTANSWER:C

Q-36-23779925

The living substance of cell was named sarcode by

(A)Corti

(B)Dujardin

(C)Lamarck

(D)Dutrochet

CORRECTANSWER:B

Q-37-13842043

Glycocalyx (mucilage sheath) of a bacterial cell may occur in the

form of a loose sheath called _________ or it may be thick and

tough called ________.

(A)capsule,slimelayer

(B)slimelayer,capsule

(C)mesosome,capsule

(D)mesosome,slimelayer

CORRECTANSWER:B

SOLUTION:

Glycocalyx(mucilagesheath)istheoutermostlayerof

thebacterialwithcellenvelopewhichconsistsofnon-

cellulosicpolysaccharideswithorwithoutproteins.It

mayoccurinthefromofloosesheath,calledslimelayer.

Ifitisathickcovering,itiscalledcapsule.Glycocalyx

givesstickycharactertothecellandisnotabsolutely

essentialforsurvivalofbacteria.Itandvirusesand

servesinattachment.Itmaygiveselectiveadvantage

thoughincertainsituations.

Q-38-23779944

Who proposed protoplasmic theory as opposed cell theory ?

(A)Virchow

(B)Schultze

(C)Sachs

(D)Strasburger

CORRECTANSWER:B

Q-39-23779960

Morphogenesis in tissue culture was discovered by

(A)Gautheret

(B)SkoogandMiller

(C)Muiretal

(D)Stewardetal

CORRECTANSWER:B

Q-40-13842045

Mesosomes are the infoldings of cell membrane, which

(i) are present in both prokaryotic and equkaryotic cells.

(ii) help in cell wall formation, DNA replication and respiration.

(iii) increase the surface area of plasma membrane.

(A)(i)and(ii)

(B)(ii)and(iii)

(C)(i)and(iii)

(D)(i),(ii)and(iii)

CORRECTANSWER:B

SOLUTION:

Mesosmesarepresentonlyinprokaryotes.

Q-41-16189770

The internal layer joining the primary walls of the two adjacent cells

is known as

" " Or

The possibility of being outermost layer of cell is highest for which

of the following

(A)Plasmodesmata

(B)Middlelamella

(C)Periderm

(D)Casparianstrip

CORRECTANSWER:B

Q-42-24359732

particles occur in

(A)Mitochondria

(B)Chloroplasts

(C)Ribosomes

(D)Roughendoplasmicreticulum

CORRECTANSWER:A

SOLUTION:

particlesoccurinmitochondria.

Q-43-13842066

Cell recognition and adhesion are facilitated by components of

plasma membrane. These components are generally

(A)proteinmoleculesalone

(B)lipidsalone

(C)bothlipidsandproteins

(D)glycolipidsandglycoproteins.

CORRECTANSWER:D

SOLUTION:

Prooteinshaveveryspecificshapeswhichmakethem

idealasrececptormoleculesforchemicalsignalling

betweencells.Branchingsidechainglycolipidsonthe

outersurfaceofcellmembranesarealsoinvolvedin

cell-cellrecognition.

Q-44-23779976

During defferentiation , RBCs lose

(A)Aerobicrespiration

(B)DNAreplication

(C)RNAsynthesis

(D)Alltheabove

CORRECTANSWER:D

Q-45-16189808

Bulk drinking of fluid by cells is termed as

" " Or

The process of sucking of fluid from the cell surface is called

(A)Phagocytosis

(B)Pinocytosis

(C)Cyclosis

(D)Osmosis

CORRECTANSWER:B

Q-46-13842062

Lipids are arranged within the membrane with

(A)polarheadstowardsinnersideandthehydrophobic

talistowardouterside

(B)bothheadsandtailstowardouterside

(C)headstowardoutersideandtailtowardsinside

(D)bothheadsandtailstowardsinnerside.

CORRECTANSWER:C

SOLUTION:

Inlipidbilayer,lipidsarearrangedwiththepolarhead

towardstheoutersideandthehydrophobic/non-polar

tailstowardstheinnerside.

Q-47-23779967

Embryoids are

(A)Somaticembryo-likestructures

(B)Smallembryosthroughfertilisationinculture

(C)EarlyembryhostagesusedforPropagationintissue

culture

(D)Alltheabove

CORRECTANSWER:A

Q-48-16189771

The strength and rigidity of a cell wall is due to the substance

known as

(A)Suberin

(B)Cellulose

(C)Lignin

(D)Pectin

CORRECTANSWER:C

Q-49-23779941

A nucleus is absent in the mature

(A)Sievetubecells

(B)Mammalianerythrocytes

(C)Monocytes

(D)BothAandB

CORRECTANSWER:D

Q-50-13842057

The best material for the study of structure of cell membrane is

(A)RBCofhuman

(B)livercell

(C)kidneycell

(D)musclecell.

CORRECTANSWER:A

SOLUTION:

RBCslacknucleusandmayothercellorganellesthus

theyarebestsuitedtostudycellmembranewithoutany

complication.

Q-51-23779929

Micrographia was written by

(A)Grew

(B)Hooke

(C)Brown

(D)Lamarck

CORRECTANSWER:B

Q-52-13842132

Which of the following is the correct match ?

(A)Amyloplasts-Storecarbohhydrates

(B)Elaioplasts-Storefastandoils

(C)Aleuroplasts-Storeproteins

(D)Allofthese

CORRECTANSWER:D

SOLUTION:

Leucoplastsarecolourlessplastidswhichgenerally

occurnewarthenucleusinthenon-greencellsand

possessinternallamellae.Therearethreetypesof

specialleucoplasts:

(i)amyloplastswhicharestarchcontainingleucoplasts,

e.g.,potatotuber.(ii)elaioplastsorlipidoplastsor

oleoplastswhicharecolourlessplastidsandstorelipids

e.g.,tuberose.(iii)aleuroplastsorproteoplastsor

proteinoplastswhichareproteinstoringplastids,e.g.,

aleuronecellsofmaizegrain,endospermcellsofcastor.

Q-53-16189805

Which one of the following is not a constituent of cell membrane

(A)Cholesterol

(B)Glycolipids

(C)Proline

(D)Phospholipids

CORRECTANSWER:C

SOLUTION:

Prolineisasecondaryaminoacidwhichisnotfoundin

plasmamembrane.

Q-54-13842064

The most abundant lipid in the cell membrane is

(A)cutin

(B)glycolipid

(C)steroid

(D)phosphoglycerides.

CORRECTANSWER:D

SOLUTION:

Thelipidcomponentofthecellmembranemainly

consistsofphosphoglycerides.

Q-55-16189772

The most abundant substance of middle lamella is

(A)Suberin

(B)Cutin

(C)Lignin

(D)Pectin

CORRECTANSWER:D

Q-56-16819765

[a=log12,b=log21,c=log11 and d=log22 then log((1)/(7)) can be

expr P(a-b)+Q(c-d) where P and Q are integers then the value of

(7P-Q) equals [ (A) 5, (D) 15]]

Q-57-13842065

Which of the best way to separate intact chloroplast from green

leaves of angiospermic plant ?

(A)Petrol-ether

(B)Chloroform

(C)10%sucrosesolution

(D)Alcohol

CORRECTANSWER:D

Q-58-23779943

A tissue having more non-living material than the living matter is

(A)Epithelialtissue

(B)Parenchyma

(C)Connectivetissue

(D)Nervoussystem

CORRECTANSWER:C

Q-59-16189755

The size of most of the cells is best expressed in

(A)�

(B)Milimeters(mm)

(C)Nanometers(nm)

(D)Micrometers(μm)

CORRECTANSWER:D

Q-60-13842071

According to the modern concept, cell membrane is

(A)solid

(B)quasifluid

(C)fluid

(D)solidifiedsheath.

CORRECTANSWER:B

Q-61-23779974

Differentiated cells are

(A)Premitoticspecialised

(B)Post-mitoticspecialised

(C)Premeiotic-specialised

(D)Post-meioticspecialised

CORRECTANSWER:B

Q-62-13842109

Which one of the mis-matched pair ?

(A)Largestisolated,singlecell-Eggofanostrich

(B)Golgiapparatus-DiscoveredbyAltman

(C)Mitochondria-NamewasgivenbyBenda

(D)Lysosomes-DiscoveredbydeDuve

CORRECTANSWER:B

SOLUTION:

GolgiapparatuswasdiscoveredbyCamilloGolginerve

cellsofbarnowlandcat.

Q-63-24359704

Lysosomal enzymes are active at pH

(D)Variable

CORRECTANSWER:A

SOLUTION:

LysosomeenzymesareactiveatacidicpH(lessthan7).

Q-64-13842098

Which of the following cell organelles are named after the name of

its discoverer ?

(B)DNA

(C)Golgibodies

(D)Mitochondria

CORRECTANSWER:C

SOLUTION:

CamilloGolgifirstrecognisedthedenselystained

reticularstructuresnearthenucleusin1898.These

werelaternamedGolgibodiesafterhim.

Q-65-16189781

The chemical substances found most abundantly in the middle

lamella is released into the phragmoplast by

(A)Endoplasmicreticulum

(B)Golgicomplex

(C)Spindlefragments

(D)Interzonalfibres

CORRECTANSWER:B

Q-66-23780063

New cells have

(A)Bacterialfermentation

(B)Regenerationofoldcells

(C)Pre-existingcells

(D)Abioticmaterial

CORRECTANSWER:C

Q-67-13842093

Mechanical support, enzyme circulation, protein synthesis and

detoxification of durgus are the function of

(A)dictyosomes

(B)chloroplast

(C)ribosomes

(D)ER.

CORRECTANSWER:D

SOLUTION:

ERfunctionascytoskeletonorskeletalframeworkby

providingmechanicalsupporttocolloidalcytoplasmic

matrix.Itconductsinformationfromcelltocell.RER

helpsinproteinsynthesis.SERtakespartin

detoxificationoftoxicchemicalinliver.

Q-68-16189775

Identify the polysaccharide with -glycosidic bondsβ

(A)Starch

(B)Glycogen

(C)Sucrose

(D)Cellulose

CORRECTANSWER:D

Q-69-13842101

These are the densely stained reticular stuctures present near the

nucleus, consisting of many flat, disc shaped cistemae of

diameter. These are

(A)chloroplasts

(B)endoplasmicreticulum

0.5 − 1.0μm

(C)mitochondria

(D)Golgiapparatus

CORRECTANSWER:D

SOLUTION:

CamilloGolgidiscoveredtheGolgiapparatusas

reticularstructure.Typically,itis in

diameterbutitsshapeandsizedependesuponthe

physiologicalstateofthecell.

Q-70-16189787

Beet root if kept in cold water anthocyanin does not come out due

to plasma membrane

(A)Differentiallypermeable

0.5 − 1.0μm

(B)Impermeabletoanthocyanis

(C)Permeabletoanthocyanins

(D)Dead

CORRECTANSWER:B

SOLUTION:

Anthocyaninpigmentcannotcomeoutsidedueto

impermeabilityofplasmamembrane.

Q-71-23780042

Living beings are made up of cells. This was first stated by

(A)Lamarck

(B)VonHelmont

(C)SchleidenandSachwann

(D)HugodeVires

CORRECTANSWER:B

Q-72-13842096

Which organelle helps in the synthesis of lipids, chloesterol,

steroids and visual pigments in epithelial cells of retina ?

(A)Golgibodies

(B)RER

(C)SER

(D)Mitochondria

CORRECTANSWER:C

Q-73-16189778

A protoplast is a cell

(A)Withoutnucleus

(B)Undergoingdivision

(C)Withoutcellwall

(D)Withoutplasmamembrane

CORRECTANSWER:C

Q-74-23780056

Physical basis of life is

(A)Nucleoplasm

(B)Cytoplasm

(C)Plasmalemma

(D)Protoplasm

CORRECTANSWER:D

Q-75-13842104

Which of the these is not a function of Golgi apparatus ?

(A)Siteofsynthesisofglycoproteinsandglycolipids

(B)Secrection

(C)Membranetransformation

(D)Siteofproteinsynthesis

CORRECTANSWER:D

SOLUTION:

TheGolgicomplexmodifies,sortsandpackages

proteinsandlipidscomingfromtheER.Packaging

involveswrappingthematerialbyamembrane,forming

secretoryvesicles.Siteofproteinsynthesisis

ribosomes.

Q-76-16189779

What is the structural element of cell wall

(A)Matrix

(B)Microtubules

(C)Microfibrils

(D)Arabinogalactans

CORRECTANSWER:D

Q-77-13842106

Cells which are secretory in function have abundant

(A)lysosomes

(B)endoplasmicreticulum

(C)dictyosomes

(D)osteosomes.

CORRECTANSWER:C

SOLUTION:

Dictyosomeisacup-shapedstructureofflattened

membranousvesiclesfoundinplantcell.Theymodify

proteinsfromtheER,andmayalsopolymerisesugarsto

polysaccharides.Theythenpackthesematerialsfor

deliverytodestinationswithinthecell,forsecretion,or

forstorage.

Q-78-23780073

Who wrote the book ''Cells and Tissues'' and coined the term of

cytology

(A)RobertHooke

(B)Leeuwenhoek

(C)Hertwig

(D)Swammerdam

CORRECTANSWER:C

Q-79-16189794

The type of cell juction which facilitates cell to cell communication

(A)Tightjunction

(B)Adheringjunction

(C)Gapjunction

(D)Desmosomes

CORRECTANSWER:C

Match column I with column II and selecrt the correct option from · 2020. 1. 7. · Viruses are...

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Tinkering with the Biochemistry of Life: Viruses, Prions, and Peptide Nucleic Acids Mark Fang Stanford iGEM 08-09

Viruses Chapter 27. 2 Nature of Viruses All viruses have same basic structure -Nucleic acid core surrounded by capsid Nucleic acid can be DNA or RNA;

Characteristics of Viruses - Brazosport College … · Characteristics of Viruses •Extracellular state •Called virion •Protein coat (capsid) surrounding nucleic acid •Nucleic

Viruses. What Are Viruses? Viruses are tiny (20 - 400 nm) particles composed of a nucleic acid core (either DNA or RNA) surrounded by a protein coat (capsid)

Bacteriophages ( a.k.a. Phages) Viruses that target bacteria Virus defining characteristics: parasitic entities Nucleic acid molecules protected by protein

Chapter 13-Viruses of Bacteria. General Characteristics of all viruses Contain a single type of nucleic acid Contain a protein coat Obligate intracellular

Viruses with different genome types adopt a similar ... · Viruses with dierent genome types adopt a similar strategy to pack nucleic acids based on positively charged protein domains

Virus Notes. Basic Definition Viruses Viruses: Submicroscopic, parasitic, acellular entity composed of a nucleic acid core surrounded by a protein coat

Viruses. What are Viruses? Virus – particles of nucleic acid, protein, and in some cases lipids –Not alive –Do NOT exhibit characteristics of life –Can

REPORTING CATEGORY 1. #1-VIRUSES VIRUSES Virus must recognize specific receptor site on host cell All viruses = 2 basic parts: –nucleic acid –protein

Viruses Viruses are nucleic acids (DNA/RNA) wrapped in protein Typically the protein coat, or capsid, of an individual virus particle, or virion, is composed

Chapter 13 - Bellarmine University Readings...13.1. GENERAL CHARACTERISTICS OF VIRUSES Virion (viral particle) is nucleic acid, protein coat • Protein coat is capsid: protects nucleic

Chapter 13-Viruses. Viroids, and Prions. General Characteristics of all viruses Contain a single type of nucleic acid Contain a protein coat Obligate

Viruses Very small Nucleic Acids (DNA or RNA) Some have phospholipid bilayer Protein Coat covering Nucleic Acids Receptors in protein coat Cannot self-replicate……so

VIRUSES. Is a virus alive? Viruses are not cells; they are not made up of cells. Viruses ARE small segments of nucleic acid that are surrounded by a protective

Viruses. What Is a Virus? Viruses are particles of nucleic acid (DNA/RNA), and a protein coat. All viruses enter living cells and use the infected cell

Preliminary Classification of Viruses Based on Quantitative Comparisons of Viral Nucleic Acids

+ Genetics of Viruses. + Viruses -small infectious particles made of nucleic acid (DNA or RNA) enclosed in a protein coat obligate intracellular parasites:

Viruses & Bacteria Viruses & Bacteria. Section 18.1 Summary – pages 475-483 VirusesViruses are nonliving infectious agents composed of nucleic acids enclosed

Structure of Viruses All viruses are composed of: – Nucleic acids: Virus’s genetic material DNA or RNA Code solely for reproduction – Capsid: Protein coat