Download Diagnosis Test: EDEXCEL ADDITIONAL SCIENCE Biology

SOLUTIONS
DiagnosisTest:EDEXCELADDITIONALSCIENCEBiology–Enzymes(15marks)
1. Whatareproteinsmadefrom?(circlethecorrectanswer)
A.
B.
C.
D.
Aminoacids
Bases
Enzymes
Glucose
(1mark)
2. Completethesentenceswiththewordsintheboxbelow;thewordsmaybeusedonce,morethanonceor
notatall.
specific
substrates
speed activesite
bind
Speed
Enzymes are proteins that ……………….
up the rate of chemical reactions. To speed up
Activesite
Substrate need to ………………………..
bind
chemical reactions the …………………..
to the enzymes ……………..
Specific
Theshapeofthisis………………….totheenzyme.
(3marks)
3. Whatdoesdenaturedmean?
Denaturediswhenanenzyme’sactivesitechangesshape(1)
Substratescannolongerbind–Enzymenolongerworks(1)
(2marks)
4. Whatarebiologicalcatalystsandstatesomereactionsthattheycatalyse?
Biologicalcatalystsareenzymesthatcatalysereactionsinsidethebody(1)
Respirationandphotosynthesis(1)
(3marks)
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SOLUTIONS
5.
QWC:
Thequalityofwrittencommunicationwillbeassessedinyouranswertothisquestion.
Explainwhataffecttemperaturehasonenzymeactivity.
(6marks)
QWCSuggestedmarkingguidance(Total6marks)
MarksawardedforthisanswerwillbedeterminedbytheQualityofWrittenCommunication(QWC)aswellasthe
standardofthescientificresponse.Teachersshouldapplya‘best-fit’approachtothemarking.
0marks
Norelevant
content.
Level1(1-2marks)
Level2(3-4marks)
Level3(5-6marks)
Describesthattemperature
increasesactivity
Thespelling,punctuation
andgrammararevery
weak.
Describesthattemperatureincreases
activity
AND
Optimumtemperaturediscussed
Thereisreasonableaccuracyin
spelling,punctuationandgrammar,
althoughtheremaystillbesome
errors.
Describesthattemperature
increasesactivity
AND
Optimumtemperaturediscussed
AND
Descriptionofdenaturedenzyme
atspecifictemperature
Theanswershowsalmostfaultless
spelling,punctuationand
grammar.
Rateofreactionincreasesastempincreases–moresuccessfulcollisions.(1)
Uptooptimumtemp370C.(1)
Maximumrateofenzymeactivity.(1)
Pastthistemperaturetheenzymedenatures.(1)
Activesitechangesshape.(1)
Substratescannolongerfit.(1)
Enzymeactivityslowsdown/stops.(1)
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