Glucosamine (R = H), a naturally occurring substance found in the exoskeleta of marine invertebrates, is believed by some to be helpful in relieving arthritic symptoms in humans. What are, respectively, the relative positions of the amino group to the CH2OH substituent and OR group?
1.cis, cis
2.trans, trans
3.cis, trans
4.trans, cis
5.cannot be determined from this kind of perspective drawing
Question 2How many secondary hydrogens are there in the cycloalkane shown below?
1.2
2.3
3.4
4.5
5.6
Question 3What is the IUPAC name for the following molecule?
1.1-(2-methylbutyl)-cyclopentane
2.2-(3-methylbutyl)-cyclopentane
3.2-(2-methylbutyl)-cyclopentane
4.(1,2-dimethylpropyl)-cyclopentane
5.(2,2-dimethylpropyl)-cyclopentane
Question 4The highest energy conformation of ethane has 12 kJ/mol of strain. The two highest conformations of butane have 16 and 19 kJ/mol of strain, respectively. How much strain does the highest energy conformation of 2,3-dimethylbutane have?
1.16 kJ/mol
2.20 kJ/mol
3.26 kJ/mol
4.31 kJ/mol
5.37 kJ/mol
The formation of a chimeric gene that is found in people with certain forms of leukemia.
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Blue whale skeleton, outside the Long Marine Laboratory at the University of California, Santa Cruz
Marine myths measured
Consequences of a double exchange occurring between two nonsister chromatids