BIO MAY 2004 HL P3 MARK B - INTERNATIONAL BACCALAURAT...

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M04/412/H(3)M+ INTERNATIONAL BACCALAUREATE BACCALAURÉAT INTERNATIONAL BACHILLERATO INTERNACIONAL c MARKSCHEME May 2004 BIOLOGY Higher Level Paper 3 13 pages
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– 2 – M04/412/H(3)M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IBCA.
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– 3 – M04/412/H(3)M+ Subject Details: Biology HL Paper 3 Markscheme Mark Allocation Candidates are required to answer ALL questions in each of TWO Options (total [20 marks] ). Maximum total = [40 marks] . General A markscheme often has more specific points worthy of a mark than the total allows. This is intentional. Do not award more than the maximum marks allowed for part of a question. When deciding upon alternative answers by candidates to those given in the markscheme, consider the following points: ± Each marking point has a separate line and the end is signified by means of a semicolon (;). ± An alternative answer or wording is indicated in the markscheme by a “/”; either wording can be accepted. ± Words in (…) in the markscheme are not necessary to gain the mark. ± The order of points does not have to be as written (unless stated otherwise). ± If the answer has the same “meaning” or can be clearly interpreted as being the same as that in the mark scheme then award the mark. ± Mark positively. Give credit for what they have achieved, and for what they have got correct, rather than penalizing them for what they have not achieved or what they have got wrong. ± Remember that many candidates are writing in a second language. Effective communication is more important than grammatical accuracy. ± Occasionally, a part of a question may require a calculation whose answer is required for subsequent parts. If an error is made in the first part then it should be penalized. However, if the incorrect answer is used correctly in subsequent parts then follow through marks should be awarded. Indicate this with “ECF” , error carried forward. ± Units should always be given where appropriate. Omission of units should only be penalized once. Ignore this, if marks for units are already specified in the markscheme. ± Do not penalize candidates for errors in significant figures, unless it is specifically referred to in the markscheme.
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– 4 – M04/412/H(3)M+ Option D – Evolution D1. (a) panspermia / cosmozoan / extra-terrestrial origin of life [1] (b) all (12) amino acids present in both samples; the levels of five of the amino acids are the same /both possess equal quantities of glycine/alanine/norvaline/isovaline/aspartic acid / etc .; meteorite contains less sarcosine/ N -ethylglycine/ ± -amino-N-butyric acid; meteorite contains more valine/proline/ ± -aminoisobutyric acid/pipecolic acid; pipecolic acid is lowest in both samples / glycine and alanine highest in both; [3 max] (c) inter-stellar material / the Earth’s reducing atmosphere could have been a source of
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This note was uploaded on 10/01/2009 for the course BIO 19839791 taught by Professor Ms.nerd during the Spring '09 term at International University of Sarajevo.

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BIO MAY 2004 HL P3 MARK B - INTERNATIONAL BACCALAURAT...

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