See Figure 7-4 Which form of glucose can have all of its substituents in the equatorial position? a В open chain None of them. There is always at least one group in the axial position.

2) For the following steroid skeleton: Me 11H H7 Ét a) If a substituent is placed at C-11 in the equatorial position, is this substituent cis or trans to the methyl group? b) If a substituent is placed at C-7 in the axial position, is this substituent cis or trans to the ethyl group? c) If a substituent is placed at C-1 trans to the methyl group, is this substituent axial equatorial?

What is the correct name of the molecule with the formnulas CH; CH, CH, CH, CH, CH2 CH3? Heptane Octane Butane Hexane Pentane

2) Circle the asymmetric, chiral carbons. H3C H3C HS H3C Н

4-ethyl-5,5-dimethyl-3-isopropyloctane whay does this structure look like with all the C's and H's?

How many chiral centers are there?

What is the name of the parent chain in the following molecule? CH3 CH₂ CH3 CH3 CH₂ CH2 CH-CH-CH-CH-CH2-CH,CH2-CH3

2. H,N но PE PC In order to synthesize PC from PE, PE is reacted with three S-adenosylmethionine (SAM) molecules, producing three S-adenosylhomoserines (SAH). Draw the chemical reactions leading from PE to PC, including the important intermediates. Use the arrow formalism. Feel free to abbreviate certain groups with R to avoid excessive drawing, but make sure to draw the full substrates and products with all atoms at least once. H2N H2N N- он он N' NH2 NH2 KH Нон он OH OH S-adenosylmethioning S-adenosylhomoserine