BIO 350 Week 3 Cell Structure and Function – Cell Types and Transport Assignment

27 Jun BIO 350 Week 3 Cell Structure and Function – Cell Types and Transport Assignment

Question
Cell Structure and Function:CellTypes and

Transport

LABREPORTASSISTANT

Thisdocumentisnotmeanttobeasubstituteforaformallaboratoryreport.TheLabReport Assistantissimplyasummaryoftheexperiment’squestions,diagramsifneeded,anddatatables thatshouldbeaddressedinaformallabreport.Theintentistofacilitatestudents’writingoflabreportsby providing this informationin an editable filewhichcan be sentto an instructor.

OBSERVATIONS

DataTable 1: Cell Structures

Prokaryote Cell Structure

Organism name:

EukaryoticCell Structure

Organism name:

Flagella Cellwall

Capsule or slime layer Nucleoid Plasma membrane Cytoplasm Ribosome Thylakoid Endospore

Pseudopodia Cell membrane

Nucleus Cytoplasm Contractilevacuole Foodvacuole Endospore

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1

DataTable 3: Diffusionthrough a DifferentiallyPermeable Membrane

At Beginning of Exercise

….. At End of Exercise …..

What are its

Contents?

What it itsinitialColor?

What is itsfinalColor?

Benedict’s

Test Color

What are its finalcontents?

DialysisTubing

NA

BeakerWater

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Exercise1:ProkaryotesandEukaryotes-Differences in Cell Structure and Function

RESULTS

1. What differencesare observed between the two cells thatwere drawn?

2. List the specificcell part that each cell type possessesto:

Prokaryote

Eukaryote

Escape from hazardousconditions?

Regulatewatercontent?

Storefood?

Reproduce?

QUESTIONS

A.With which cell type, prokaryote or eukaryote, areyou mostfamiliar?

B. Which cell typewould be most successful inextreme environments? Why?

C. BecausetheProkaryotebacteriaaregenerally3µmorlessinlengththeymaynotexhibit specificstructuresunderacompoundlightmicroscope.Whattypeofmicroscopewouldbea betterchoicefor viewing bacteria?

D.Researchamoebasonlineandgiveafewexamplesincludingwheretheyarefoundandwhat energy source they use.

E. Discusswhethercyanobacteriaandamoebasarebeneficialordetrimentaltohumansandto the environment ingeneral.

Exercise2:Eukaryotes–PlantandAnimalCell

Structure and Function

RESULTS

1. What differencesare observed between the two cells thatwere drawn?

2. List the cell part that each cell type possessesto:

Plant

Animal

Regulatewatercontent?

Produce energyto power cell function?

Storefood?

Reproduce?

QUESTIONS

A.With which cell type, plant or animal, areyou mostfamiliar?

B. Which cell typewould be most successful inextreme environments? Why?

C. OutlinethegeneraldifferencesbetweenplantandanimalcellsinTable1.Thenoutlinethe similarities.

Table1: ComparisonofStructure andFunction:AnimalandPlantCells

Animal Cells

Plant Cells

Differences:

Similarities:

Exercise3:TransportofMaterialsthroughCell

Membranes – An Example ofPassiveTransport

QUESTIONS

A.Which mediumexhibited thefastestrate of diffusion?

B. What might bereasonstoexplain the differencesin therate of diffusion?

C. Graphthe twosets ofresultsfromTable2 onthe same graphusingacomputer spreadsheet programandincludethisgraphinyourreport.Whyissimultaneousgraphingoftheresultsuseful here?Whattypeofgraphwouldbestdemonstrateratesofdiffusioningelatinversusliquid?Hint: The graph should show acontinuityfrom Toto T1for both mediums.

DISCUSSION

A.Wereyour twohypotheses supported orrefuted?

B. How might therate of diffusionbe increased? Decreased?

C. How might this betested?

D.Why is thisexercise be anexample of passive transport?

E. Whymustthespreadofthecoloringinthegelatinbemonitored?Forexample,whycan’tit just be leftfor 10 hours before the measurement istaken?

F. Whatwouldbeagraphicmethodtodetectwhentherateofdiffusioninthegelatinwasat maximum andwas beginningto slow?

G.Constructatablethatcomparesyourresultstotheaverageofyourclassmates’results,ifavailable. Indicate how many classmates’results arerepresented in theaverage (N=?). Include it inyourreport. Areresults similar? If not, what mightexplain the differencesin outcomes?

Exercise4:TransportofMaterialsthroughCell

Membranes – An Example of ActiveTransport

QUESTIONS

A.What are thetest substances?

B. Why did acolor change occur in the jarwater? What does thecolor change indicate?

C. Why did acolor change occur in the dialysis bag? What does thecolor change indicate?

D.What does the Benedict’sreagenttest detect? What does thetest of the jarwater indicate? E. What DID NOT diffuseacross the dialysis bag membrane? Why?

DISCUSSION

A.Wasyourhypothesis supported orrefuted?

B. How might the dialysis membrane tubing be similarto a plasma membrane?

C. What type of transport mechanism does thisexercise simulate?

D.Whatcan beconcluded from thisexercise?

LABORATORYSUMMARY

What haveyou learned from doing this laboratory?