Question

VULTIPLE CHOICE points each) 1) What is TRUE about the 20mino acids used to form proteins? a) They all are in the "L"configuration b) They are all in the form meaning the amino group is opposite the acid group e) They are all chiral. - They are all "Tertiary with four different groups attached They are all secondary with the aming group on the carbon secondary to the acid group 2) Fibrinoge is a protein involved in blood clotting. It's fully functional form requires three different protein chains (ar, and y strands) to form a hermer (six unit complex) with an included Ca ion. This is an example of a) protein primary structure b) protein secondary structure. c) protein tertiary structure d) protein quaternary structure e) protein sequencing 3) Consider the B-oxidation spiral. Which statement is TRUE? a) "B" - oxidation occurs at the second carbon from the carboxylic acid carbon (B) b) "oxidation" - because it produces CO, Coxidized carbon) c) "spiral- because of the spiral structure of long chain fatty acids ("cls") d'oxidation" - because fats are oxidized to carbohydrates e) "spiral" - because a fatty acids spirals into the a-helix protein structure 4) The enzyme, Citrate synthase is a key controlling point of the Krebs Cycle. It controls the entry of carbon (acetyl group) into the cycle. High concentrations of citrate inhibit the enzyme. This is an example of ... a) feedback inhibition b) B-blocker inhibition c) substrate acitation d) hllosteric inhibition e) induced fit inhibition 5) Which of the following is NOT a lipid? a) Fat soluble vitamins, A, D, E, and K b) Proteins c) Fatty acids d) Steroids e) Oils 6) Enzyme catalysts often display the following characteristic diagram. Which statement is the most likely explanation for the behavior? a) The catalyst has become saturated b) The catalyst has only one "space", an active site but no regulatory site. Temperature, too hot or too cold, deactivates the catalyst. d) The catalyst has been poisoned. e) The reaction releases energy in the form of heat. rate temperature Which is one of the primary functions of the fatty acid cycle? a) To be a direct source of energy in the form of ATP b) To produce electrons in the form of NADH and FADH; c) To oxidize carbon into CO2 d) To store fats in the form of triglycerides e) To provide energy under anaerobic conditions

Answer 1

Answer:
Among the 20 essntial amino acid listed in the answer below , which are required for bulding up of protein only Glycine is achiral , thus can't form L/D configuration, $\beta$ form not possible and can't be tertiary as two Hs are attached to the carbon atom.

Hence, option-e is the only true statement.

Multiple choice Question: Answey – option- Reason: 20 Armino acids used to forcy proteins vas was follows 0. Glycine . Alanine , .valine . Lencine . Isolcasine KN-CH-Com IN-CH-COOH IN-ert CONH N-SH-COOH IN-CH-Coom CH3 CH3 meten en-ers M ©. Serine ©. Threonine O. Systene O. Methionine only Glycine қv-сон ҳм-н-сон қ»-и- сен -си-сон vachi nal... No Lº Aspartic acid . glutamic acid D-configuration. . Aspargine B IN-CH-COOM Glusharing AN-CH-coH U N-CH-CNR B-form not possible SN-en-Com LooH Broom fom Glycine . Lysine . Arginine @. Histidine © beline CONH → Not rentiary -ch-CCOM SN-CH-coom AN-Cr-coom was there is tuo Ms. (CM)4 PM)s . Men HN-E-NL 2 an option - . Phenylalanine . Tynosine Tryptophan IN-MONM - • • • MR N-HC OM OM Le sme toon SOM ANN--COOM .