BCHE2030.pdf - ~ Jcfw ~;f tP ~:k ~-t Jcfw Page 1 of 10...

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~ - J{ (# -t J{) Page 1 of 10 J',Ii;j{i;,iT::fl :f: fJj-fi fr ;f- ~~ tP ~ :k. ~ Copyright Reserved The Chinese University of Hong Kong ~O-O£~O--~&~~M#§~~ Course Examination 1 st Term, 2010-2011 tl- g ,MI, ~t &. ~ ~~ Course Code & Title: ... ~g!j:§?Q}9RlJ.:!!4.~~!!t~!~(?r~~(?~h~~i.~~!:Y 81-M +B~ ~Hi Time allowed 2 hours 0 minutes * 1.,MI,Mt a.Mt Student I.D. No. Seat No.: Total marks for this paper are 65. Put the answers for Sections A and B into the computer answer sheet. SECTION A: Multiple Choice Questions. For each question, choose the one best or most appropriate answer. Each carries 1 mark. Answer ALL questions. Multiple Choice Questions not to be provided P.l - P.I)
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Course Code tt § MiJ~: BCHE2030 1ft 7>. J{ (~ + J{) Page 6 of 10 SECTION B: Assertion-Reason Questions. Each carries 1 mark. Answer ALL questions. Each question consists of an assertion and a reason. Select one of the five choices based on the following guidelines: Answer Assertion statement Reason statement A. e.g. True The Earth has a stronger gravity than the Moon. BECAUSE True AND the Reason statement is a correct explanation. The mass of the Earth is larger. B. e.g. True The Earth has a stronger gravity than the Moon. BECAUSE True BUT the Reason statement is NOT a correct explanation. The Earth has an atmosphere. C. True False D. False True E. False False Assertion-Reason Questions not to be provided P.6 -P.7.
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Course Code # EI ,~Mt: BCHE2030 ~ A J( (#- ;- J() Page 8 of 10 .............................................................................. Student I.D. No. ~ ±.~Mt: Seat No . .&~: SECTION C: Short-answer Questions. Each carries 5 marks. Answer ALL FIVE questions. Put your answers in the space provided on this question paper. 1. Given the pK], pK 2 and pK R values of cysteine are 1.96,8.18 and 10.28, respectively. (a) Calculate the pI value of tyrosine. (b) Draw the chemical structure of the major species of cysteine at pH 9. 2. Predict how ~-isopropylmalate is converted to leucine. Draw the chemical structure of X, and name the cofactor required in step A. CH 3 H6-CH 3 A H6-coo- .. x .. Ht-OH I COO - f 3-isopropylmalate Leucine
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Course Code # § ,#tQ~: BCHE2030 ~ fL J{ (# +- J{) Page 9 of 10 Student I.D. No. $ !:L~Jij~: Seat No. ft Wi. : 3. Acetolactate synthase uses thiamine pyrophosphate as a cofactor. Predict and draw the chemical structure ofthe product(s) of the following reaction: o H c-c.JLcoo- 3 H 2 u-ketobutyrate acetolactate synthase .. + o H 3 c.JLcoo- pyruvate 4. a-ketoadipate dehydrogenase is an enzyme that uses NAD+, coenzyme A, and thiamine pyrophosphate as cofactors. Predict and draw the chemical structure of the product(s) ofthe following reaction: a-ketoadipate dehydrogenase ((-ketoadipate
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Course Code *+ § J~M'.: BCHE2030 ~ + JH ~ + JO Page 10 of 10 5. Predict how phenylalanine is converted to phenyllactate. Draw the chemical structure of Z, and predict the cofactor involved in step C. OH I HC-COO- I aminotransferase --:------- Z ~ pyruvate alanine c 2) Phenylalanine Phen yll actate - END OF PAPER-
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~ - J{ (# 1L J{) Page 1 of 9 f&:flpfj-;/f ~1.f~fp ~ ~~ 0/ 5C.
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