Which of the following is not totally dissociated when mixed with water? a. HCl p. HBr C. HI d. HF е. HNO3

A circular double-stranded DNA molecule contains 4200 base pairs. In solu- tion the molecule is in a B-form helix, with about 10.5 base pairs per turn. The DNA circle has 12 superhelical turns. What is its superhelix density o?

Which statement best explains the chemical differencesbetween DNA and RNA? (a) DNA has two different sugarsin its sugar–phosphate backbone, but RNA only has one.(b) Thymine is one of the DNA bases, whereas RNA’s correspondingbase is thymine minus a methyl group. (c) TheRNA sugar–phosphate backbone contains fewer oxygenatoms than DNA’s backbone. (d) DNA forms double helicesbut RNA cannot.

(CH21/23) [References] Draw the structure of the major organic product(s) of the reaction. H₂C 1. 2 CH3MgBr, ether 2. H₂O You do not have to consider stereochemistry. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu. 89 ? ChemDoodle 424 [F Previous Next Save and Exit

Please don't provide handwriting solution   The structure given below has what type of glycosidic linkage?

3. Classify the following as a lipid, carbohydrate, or amino acid: (EOCQ 58) CH,OC(CH,)12CH, CHOC(CH,),,CH, CH,0C(CH,),CH=CH(CH,),CH, a.

Thanks i need it in words not pictures

Cheto

A³ 7. Which of the following is NOT true of a collagen helix or collagen? a) A collagen helix cannot contain prolines. b) A collagen helix has a special amino acid called Hyp c) Collagen is a fibrous protein d) In collagen three helices come together to form a triple helix 8. Which of the following CANNOT make a H-bond. More than one can be circled. a) N-HO=C b) N…H-O-H Ⓒ)C=O....N-C (d))C=OH-O- 9. Which of the following statements describes an apoenzyme? a) the place where a substrate binds b) an apoenzyme is an organic molecule that an enzyme needs to function correctly can apoenzyme is an enzyme that does not have its cofactor and therefore is not functioning it describes a theory on how substrates and enzymes interact.

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