Stellenbosch University-South Africa
BIOCHEMIST 214
Biochemie - Biochemistry - 214
Dashboard / My courses / Biochemie - Biochemistry - 214 / Aanlyn Toetse / Online Tests: / TEST A1 Theme A to D
Started on Thursday, 29 April 2021, 17:30
State Finished
Completed on Thursday, 29 April 2021, 19:45
Time taken 2 hours 15 mins
Grade 59.00 out of 80.00 (74%)
Ques
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Biochemie - Biochemistry - 214
Dashboard / My courses / Biochemie - Biochemistry - 214 / Aanlyn Toetse / Online Tests: / TEST A1 Theme A to D
Started on Thursday, 29 April 2021, 17:30
State Finished
Completed on Thursday, 29 April 2021, 19:45
Time taken 2 hours 15 mins
Grade 59.00 out of 80.00 (74%)
Question 1
Correct
Mark 1.00 out of 1.00
Indicate if the following statement is True or False
The trans conformation of the peptide bond occurs most frequently in nature at a ratio of 2:1 with that of the cis conformation. / Die trans konformasie van die
peptied binding vind meestal in die natuur plaas teen 'n verhouding van 2:1 met dié van die cis-konformasie.
Select one:
True
False
The correct answer is 'False'.
Question 2
Incorrect
Mark 0.00 out of 1.00
Question 3
Correct
Mark 1.00 out of 1.00
A part of a nucleotide sequence of the template DNA-chain (“anti-sense”) is as follows: / ’n Gedeelte van ’n nukleotiedvolgorde van ’n templaat DNA-string
(“anti-sin”) is soos volg:
5’……TTATCTACCATTGGGGGTGCATAC..…. 3’
Examine the following statement about the above DNA sequence and mark your choice (a, b, c, d or e). / Bestudeer die onderstaande stelling oor die
bostaande DNA volgorde en merk u keuse (a, b, c, d of e).
The number of different tRNA molucules necessary to translate the mRNA is: / Die aantal verskillende tRNA molekules wat nodig is om die mRNA te transleer
(vertaal) is:
Select one:
A. 8
B. 5
C. 24
D. None of the choices / Geen van die keuses
E. 6
The correct answer is: 5
Indicate if the following statement is True or False
The D-form of amino acids are the most commonly found form in proteins. / Die D-form van amino sure is die mees herkenbare vorm in proteïne.
Select one:
True
False
The correct answer is 'False'.
Question 4
Correct
Mark 1.00 out of 1.00
Question 5
Complete
Mark 10.00 out of 15.00
Indicate if the following statement is True or False
The liquid phase of water is denser than its solid phase. / Die vloeibare fase van water is meer dens as die van sy soliede fase.
Select one:
True
False
The correct answer is 'True'.
Consider the following peptide: / Beskou die volgende peptide:
Met-Ala-Lys-Tyr-His-Glu
A. Draw the structure of the peptide at pH 9.5. Make sure you show all the atoms and clearly indicate all the charges on the appropriate groups. / Teken die struktuur
van die peptied by ʼn pH van 9.5. Maak seker jy wys al die atome aan en die ladings op die toepaslike groepe. [10]
B. Calculate the pH at which the molecule exists as a zwitter-ion. Bereken die pH waar die molekuul as 'n zwitterioon voorkom. [5]
5.pdf
Question 6
Complete
Mark 8.00 out of 8.00
Question 7
Correct
Mark 1.00 out of 1.00
Calculate the ratio of the ionic species which is protonated (has acid properties) relative to the deprotonated form in a dilute solution of the below peptide at pH 4.0 /
Bereken die persentasie van die ioniese spesie wat geprotoneerd is (het suur eienskappe) relatief tot die degeprotoneerde vorm in 'n verdunde oplossing van die
onderstaande peptied by pH 4.0
Glu-Arg-Leu
As part of your answer, also write down the ionization equation for the peptide. / As deel van jou antwoord, skryf ook die ioniserings vergelyking vir die peptied
neer.
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