43. Which of the following structures has the R configuration? H CH,CH3 CH2CH3 CH3 он H,CH2C CI Br CH3 II A) Only I B) Only II C) Only I and II D) I, II and III 44. Which of the following structures has the R configuration? H он CH¿CH3 H3C CH,CH3 H. Он H,CH2C II II A) Only I B) Only II C) Only I and II D) I, II and III 45. Which of the following is the definition for a pair of diastereomers? A) A pair of stereoisomers with stereogenic centers which is not chiral. B) A pair of stereoisomers that are superimposable mirror images of each other. C) A pair of stereoisomers that are not superimposable mirror images of each other. D) A pair of stereoisomers that are not mirror images of each other.

The students conducted the assay for LDH activity using the two serum samples. Each cuvette (path length 1 cm) contained 3ml of a suitable assay buffer (including pyruvate as substrate). 20 microlitres of either serum was added to the cuvette and the absorbance values immediately recorded at the optimum wavelength for a period of 5 minutes (absorbance readings taken every 30 seconds).   Protein concentration of serum sample (mg/ml) Change in absorbance at optimum wavelength per minute Control serum (C) 8 -0.04 Diseased serum (D) 7.8 -0.6 1c. Using the molar absorption coefficient of NADH as 6220 M-1 cm-1, and by application of the Beer-Lambert law, estimate the enzyme activity in the two samples (C and D). Express activity as moles per second.  1d. Estimate the specific activity of the two samples (moles per second per microgram).

30 70- 60- 50- 40- 30 20 10 0₁ 4000 Ророжа Structue nd, C₂H₂1N 3500 иде Sp 3000 2500 18 +2-20 го- 2000 1800 hu 1600 Ф тро 1400 1200 1000 800 6 Н 6 Н 9 Н 600 У

(17360 Systane Part B CH3 CH3 CH3-CH₂-CH-CH-CH₂-OH Spell out the full name of the compound. Submit Request Answer Part C OH CH₂-CH3 P dy 44#1 BAKER -2221 51-19-145 ciation, Inc. OS WINE 19 25 OCT 2022 PM) Address Herbert Epstein 14773 Cumberland C DELRAY BEACH, F အင်းတင်း 46-135654 2 ^ [