Example questions from previous tests and exams SECTION A The given structure of steroid A relates to questions 1 and 2. II III I OH CH3 CH3 VIII OH OH CH3 O F O F H3C VII IV V VI Steroid A 1. Which of the following factors will increase sodium-retaining activity? i. Replacing III with an F-atom. ii. Replacing III with a chlorine atom. iii. Replacing III with a bromine atom. iv. Removing the ketol side chain. a) b) c) d) e) f) 2. (2) ii and iii only i only ii only i and iv only iv only None of the above Which of the following statements are TRUE about the 11β-OH group of steroid A? (2) i. ii. iii. iv. v. a) b) c) d) e) It plays an important role in binding to the glucocorticoid receptor. If it is removed, glucocorticoid activity will decrease. If it is removed, mineralocorticoid activity will decrease. If it is removed, mineralocorticoid activity will increase. It does not have an effect on the mineralocorticoid activity. i, ii iii and v only i, ii iv and v only ii, iii and v only i, iii and v only None of the above 3. Which one of the following synthetic modifications will not favour anabolic activity of androstane? (2) a) b) c) d) e) 4. Which one if the following statements about androgen derivatives is true? a) b) c) d) e) 5. (2) Esterification of the 17β-OH group favours androgenic activity. 3-keto group enhances anabolic activity Removal of C-19 favours anabolic activity Introducing a 2-alkyl group favours androgenic activity. None of the above Which of the following statements are true about a carbocation? (2) i. It is a positively charged species. ii. It can be stabilised by an adjacent electron withdrawing group. iii. An allylic carbocation is more stable than a vinylic carbocation. iv. A benzylic carbocation is less stable than an allylic carbocation. v. A tertiary carbocation is more stable than a secondary carbocation because there are more electron withdrawing alkyl groups attached to it. a) b) c) d) e) f) g) 6. Replacing C-2 with O. Introducing a 3-keto group Removing C-19 Introducing a 17α-alkyl group. None of the above i only ii and iv only i and iii only i, iii and v only i and v only None of the above combinations, a) to e), are true None of the statements, i. to v., are true Structural classes that have similar activities to progesterone are: a) b) c) d) Testosterones 19-nortestosterones All of the above None of the above (2) 7. Which of the following arrows are going in the correct direction? A B H H H + O Cl H H Cl D O O CH3 CH3 a) b) c) d) e) f) A and B only E and F only C and D only A, E and F only B, C and D only None of the above [SUB TOTAL : 14] O + O O C H O CH3 CH3 H + O H F H2O CH3 O H Cl CH3 E SECTION B QUESTION 7 Take the concepts or words in the column on the right and write them next to the words that they best correspond to in the column on the left. More than one word or concept on the right can correspond with one or more words or concepts on the left. A topic in the left-hand column can have more than one corresponding word or concept on the right. The number of matching concepts or words that you must provide are indicated in brackets. In the online test it will look slightly different, because you will have to match one on the left with the best one on the right. The question below is a good for practising. Inactive sex hormone (2 concepts or words) Bioactive Cardiac glycoside (4 concepts or words) Bioactive glucocorticoid (7 concepts or words) Bioactive mineralocorticoid (5 answer) More stable free radicals (2 answers) Photodegradation of Sertraline (2 answers) Homolytic cleavage (2 answers) Progesterone (2 answers) (26) Cis-fused C and D rings Cholic acid Formation of a racemate. Maintains pregnancy Single head arrow Hexestrol Inotropic Drug Testosterone metabolite Cis-fused A and B rings Adrenal gland Formation of a benzylic free radical Hydrocortisone 11β-hydroxy group Aldosterone Bufadienolide Lactone ring Double head arrow Electrolyte balance Larger, more polarisable atoms Sugar metabolism All trans-fused rings Formation of free radicals 5β-dihydroxy testosterone Equilenin Non-steroidal estrogens Delocalisation Fat metabolism Two-head arrow Trans-diethylstilbestrol Cortisol