Choose the correct product for the following Diels-Alder reaction. OEt OEt product OEt OEt OEt OEt OEt OH OH of of off of A B C OEt D E O Targets placed: 0/3 You can place up to 3 targets Undo Delete selected Remove All

A student is attempting to add asparagine to a methionine that is connected to a solid polystyrene bead. They mix together the two components below with DCC, and some of the indicated product is generated. However, more happens in this mixture, resulting in multiple products. What reactivity is happening, and how can it be avoided (to give the indicated product in high yield)?

1.) Propose the biosynthesis of 5-methylorsellinic acid: CH3 НО. CH3 `CO,H OH

You resuspend 1 ml of of a purified chlorophyll sample in 10 ml of 80% acetone, and determine that the optical density of the solution (at 652 nm) is 0.88. What is the concentration of your original preparation?

Select the product for the following cyclization CHO OH OH OH H OH OH Но HO HO OH но Но - OH HO HO Но. OH H- OH OH H H H ČH2OH 1 3 О 1&2 1 2

Identify if the following is a pyrimidine/purine nucleotide or a pyrimidine/purine nucleoside and write whether the sugar moiety is a ribose or deoxyribose. NH2 NH2 HO-P-o HO В. ÓH ÓH ОН H3C. NH HN но С. OCH2 CH2 D. H. OH он OH

Which of the following is the correct statement for the a anomer and B anomer of D-arabinose? O They contain axial or equatorial carbonyl groups. They have different configurations around only one carbon atom They are two unstable ring structures that are mirror images. O They contain different numbers of hydroxyl groups.

Most of the following conclusions regarding the photo shown above are correct Except: All of the following are correct regarding the disk diffusion test photos EXCEPT : Zone of inhibition Chlorine Chlorine Chlorine O-phenylphenol Hexachlorophene O-phenylphenol Hexachlorophene Hexachlorophene O-phenylpheno Quat Quat Quat Staphylococcus aureus (gram-positive) Escherichia coli Pseudomonas aeruginosa (gram-negative) (gram-negative) Select one: O to. Gram negative bacteria are the most sensitive to chemical agents O b. Only one of the four chemicals affected Pseudomonas O c. Gram positive bacteria are the most sensitive to disinfectants O d. Hexachlorophene was effective only against Gram positive bacteria. O and. Chlorine was effective against all bacteria bacteria tested

A bacterial culture is grown using either octadecane (C18H38) or pentachlorophenol (C6HOCl5)) as the sole source of carbon and energy. The cell yield value is determined by dry weight analysis to be 1.49 for octadecane and 0.05 for pentachlorophenol. Using either octadecane or pentachlorophenol, please describe the steps taken (and the final result) showing what percentage of the substrate carbon will be found as cell mass and as CO2?  Please show all calculations and give correct answers.

Explain why quinuclidine is a much more reactive nucleophile than triethylamine, even though both compounds have N atoms surrounded by three R groups.