Please asnwer the following multiple choice questions in the picture below: The
ID: 533091 • Letter: P
Question
Please asnwer the following multiple choice questions in the picture below:
The amino acid leucine that is incorporated into proteins has the L configuration. Answer the following true-false questions.
1. The amino acid leucine that is incorporated into proteins has the L configuration. Answer the following true-false questions. (2 points) A. L-Leucine must be levorotatory by definition. True: False: B. D-Leucine is the enantiomer of L-leucine. True False: C. Cells routinely incorporate L-leucine into one set of proteins and D-leucine into aseparate series of enantiomeric proteins. False: True: D. The Lindicates that leucine is in the S configuration. False: True: 2. Multiple choice, 1 point. A correctly labeled bottle indicates that it contains pure 2-pentanol. A correctly done test shows that there is no optical activity. Which of these statements is the best explanation? FOR CREDIT, PUTTHE LETTER OF THE BEST ANSWER HERE: A. 2-Pentanol is not chiral B. The sample is racemic. C. The sample is the meso diastereomer of 2-pentanol. D. There are two diastereomers of 2-pentanol that cancel their optical activity. E. 2-Pentanol does not show optical activity because it is stable when illuminated. 3. Multiple choice, 1 point. Which ofthe following correctly describes intermediates and/or transition states? FOR CREDIT, PUT THE LETTER OF THE BEST ANSWER HERE: A. Transition states occur at low points on reaction coordinate diagrams. B. Both transition states and intermediates occur at maxima on reaction coordinate diagrams. C. An intermediate is always produced after the rate-determining step of a reaction mechanism. D. Transition states have partially formed bonds whereas intermediates have fully formed bonds. 4. Multiple choice, 1 point. Which of these starting materials will give a different product when reacted with excess hydrogen in the presence of a palladium/carbon catalyst? FOR CREDIT, PUTTHE LETTER OF THE BEST ANSWER HERE: A. vinylcyclohexane B. 2-ethylcyclohexene C. 3-ethyl-1,4-cyclohexadieneExplanation / Answer
(1)
(a) True
(b) True
(c) True, because cells are known to be very specific in the type of compounds they produce
(d) False
(2)
B. The sample is a racemic mixture
(3)
D. Transition states have partially formed bonds while intermediates have fully formed bonds.
(4)
Compunds A,C and D will react to give a different product because all their double bonds will be reduced. Compound B doesn't react because hexene can't be reduced by this since it requires high pressure conditions for getting reduced.