Answer Key for Practise Exam

Topics: Neuron, Brain, Districts of Vienna Pages: 35 (3357 words) Published: January 6, 2015
c

IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI

SPEC/4/BIOLO/HPM/ENG/TZ0/XX/M

MARKSCHEME
SPECIMEN PAPER

BIOLOGY

Higher Level

Paper 1

2 pages

–2–

SPEC/4/BIOLO/HPM/ENG/TZ0/XX/M

1.

B

16.

C

31.

D

46.



2.

C

17.

B

32.

D

47.



3.

D

18.

B

33.

A

48.



4.

D

19.

B

34.

D

49.



5.

D

20.

B

35.

C

50.



6.

D

21.

B

36.

D

51.



7.

B

22.

B

37.

B

52.



8.

B

23.

D

38.

D

53.



9.

A

24.

C

39.

A

54.



10.

D

25.

D

40.

A

55.



11.

C

26.

B

41.



56.



12.

D

27.

D

42.



57.



13.

C

28.

C

43.



58.



14.

D

29.

A

44.



59.



15.

D

30.

B

45.



60.





IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI

SPEC/4/BIOLO/HP2/ENG/TZ0/XX/M

MARKSCHEME

SPECIMEN PAPER

BIOLOGY

Higher Level

Paper 2

8 pages

–2–

SPEC/4/BIOLO/HP2/ENG/TZ0/XX/M

Section A
1.

(a)

at lower concentration inhibition is low;
as concentration rises from 5 – 20μmol dm 3 there is very little increase in inhibition; from 20μ mol dm 3 inhibition increases in a linear manner;
a valid comparison with another of the peptides;
[2 max]

(b)

no effect on S. aureus, inhibits growth of C. albicans;
no change on S. aureus as concentration increases, inhibition of C. albicans increases with concentration;

(c)

at lowest (experimental) concentration (LL-37) does not have effect on either; as concentration increases so does inhibition;
greater inhibition of C. albicans;
effective against C. albicans but not/less effective on S aureus;

(d)

LLG

(e)

18 2 16 /

[3 max]
[1]

16
100% / 8 100%;
2

800% ;
(f)

[2]

LLG/naturally occurring peptide less effective;
LL-37 less effective than GKE/FKR;
LL-37 damages DNA (significantly) at more than 6μmol dm 3 ; LL-37 may kill cells at higher concentrations;
GKE/FKR could be used at lower concentrations;
GKE/FKR cause slight DNA damage at lower concentrations;
GKE is (slightly) more effective;
GKE causes increased DNA fragmentation at higher concentrations;

(g)

β-sheet / β-pleat

(h)

sharp peak, strong chance around 20-25;
smaller peak, strong chance at around 4-6;
no likelihood above 32/33/at end of molecule;
appropriate description e.g. chance increases from 13/14 to 20/25;
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on Grammar Exam Answer Key
  • Fall 2014 exam answer key Essay
  • Accounting 2 Exam Answer Key Essay
  • Essay about LAW 421 Final Exam Answers
  • Exam 2008 Answer Key Essay
  • Answer key Essay
  • ANswer key Essay
  • Activity 9 Homework Answer Key Essay

Become a StudyMode Member

Sign Up - It's Free