Upload an image of your answer to this question. Both pyruvate decarboxylase (an enzyme associated with alcoholic fermentation) and one of the enzymes in the pyruvate dehydrogenase complex (E1) require thiamine pyrophosphate (TPP). In fact, the same substrate goes through a common carbanion intermediate in both of these enzymatic reactions.  Draw the arrow pushing mechanism for the formation of this common carbanion intermediate and show how it is stabilized. For TPP, you only have to show the structural part that is involved in the reaction, i.e. the business end of the cofactor.  (5 pts.)  Beginning with the common stabilized carbanion intermediate, draw the arrow pushing mechanism for how a covalent S-acetyl dihydrolipoyl intermediate is formed in the pyruvate dehydrogenase complex. For the cofactors, you only have to show the ring structural part that is involved in the reaction – again, the business end of the cofactor.  (5 pts.)   

       die Glasglocke     

 die Frischhaltefolie

Which of the following describes the characteristics of the torque produced by the muscles?

You are performing an overhead shoulder press (picture). During the exercise, the torque produced by the arm/dumbbell weight rotates the shoulder into ________ .

Explain why sitting with a forward head posture for a prolonged time can lead to neck pain using the concept of lever and mechanical advantage. Clearly explain your answer in complete sentences to receive full credit.

¿Qué están haciendo? Complete the following sentence with the correct present progressive form of the verb in parentheses. Type one word per answer box.                           á   é  í  ó   ú   ñ 1.Juan y Mateo al fútbol en el estadio. (jugar)  2.Tú tienes prisa; . (correr)               3.Nosotros tenemos un examen mañana; . (estudiar)  4.Anita su libro. (leer)

En el presente y los hábitos.  Complete the following sentences by choosing the correct dar or decir form, according to context. Use (copy & paste) them as given. 1.El profesor nos un examen todos los viernes.   da    damos    dice    decimos    ___________________________________________________________________________ 2. Nosotros siempre le dinero a Paco.   damos    da    decimos    dice    _______________________________________________________________________ 3. Tú me la verdad, ¿no?   doy    das    digo    dices    _____________________________________________________________________ 4. Los padres le una fiesta a su hija para su cumpleaños.   dan    da    dicen    dice    __________________________________________________________________________ 5. Mayte y José les la verdad a todos nuestros compañeros.   damos    dan    dices    dicen   

Gustar y otros verbos similares Complete the following sentence with the correct indirect object pronoun & the Present (indicative) tense form of the logical verb in parenthesis, according to context. Note: These are not reflexive verbs. Type one word per answer box: 1st- Indirect object pronoun, & 2nd- Verb in the present tense. 1. ¿A ti (aburrir / parecer ) interesante este libro? 2. A nosotros  (encantar / parecer) jugar al fútbol. 3. A ellos (aburrir / apetecer) la literatura y las humanidades, y no quieren tomarlas. 4. Ustedes siempre dicen que no entienden las matemáticas. (gustar / molestar) tomar la clase, ¿verdad? 5. A Karla (faltar / fascinar) $2 dólares para comprar comida. 

En el pasado.  Complete the following sentences by choosing the appropriate Preterit form, according to context. Type only the letter in the blank. 1. Los niños ocho horas anoche. a. prefirieron b. preferí c. dormí d. durmieron   2. Ayer ustedes las noticias, ¿no? a. oyeron b. oyó c. pidieron d. pidió     3. Mis padres vino tinto con la cena el viernes pasado. a. sintieron b. sintió c. prefirieron d. prefirió     4. El mesero les las especialidades del día porque él no las sabía (didn’t know) de memoria. a. leyeron b, leyó c. creyó d. creyeron   5. Yo postre ese día. a. preferimos b. prefirió c. pedí d. pidió