Bch 369 Study guides, Class notes & Summaries

BCH 369 EXAM 3 QUESTIONS WITH ALL REVISED ANSWERS 1 Which of the following types of RNA undergo post-transcriptional modifications? a. mRNA b. rRNA c. tRNA d. All of the above e. None of the above - Answer-d 2 Which of these terms does not describe the DNA strand used to direct RNA synthesis? a. Template strand b. Coding strand c. Antisense strand d. Negative or "−" strand e. All these terms describe the DNA strand used to direct RNA synthesis - Answer-b 3 RNA synthesis beg...

BCH 369 TEST 3 QUESTIONS WITH ALL ANSWERS CERTIFIED Which of the following accurately describes the lipid bilayer in biological membranes? A) The bilayer is stabilized by hydrophilic interactions between the polar lipid head groups and the aqueous environment. B) Integral membrane proteins enhance the stability of membrane lipid bilayers. C) The thickness of membrane bilayers varies slightly, depending on the fatty acids incorporated in the lipids. D) Individual lipid molecules flip-flop r...

BCH 369 EXAM 4 QUESTIONS WITH REVISED ANSWERS Which of the following does NOT correctly describe insulin's role in human metabolism? A) Insulin activates glycogenolysis. B) Insulin results in fatty acids being stored as fat in adipocytes. C) Insulin activates phosphatases. D) Insulin is released in response to high blood glucose. - Answer-A) Insulin activates glycogenolysis. Given the following starting substrate, A, place the following reaction intermediates in order of their appearan...

BCH 369 TESTED QUESTIONS WITH VERIFIED ANSWERS What is the role of the disulfide bond is oxytocin and vasopresin? - Answer-the disulfide bond is responsible for the cyclic structure of both Match protein structure: 1. The order of amino acid residues in the polypeptide chain 2. The interaction between subunits in proteins that consist of more than one polypeptide chain 3. The hydrogen-bonded arrangment of the polypeptide backbone 4. The 3-D arrangement of all atoms - Answer-1. Primary 2...

How does the addition of an enzyme to a chemical reaction affect the initial velocity of the reaction? A) Increases it B) Decreases it C) No effect - Answer A) Increases it Enzymes work by reducing the activation energy barrier of a reaction. Which of the following processes does NOT contribute to this? A) The enzyme binds the substrate specifically and with high affinity. B) Specific amino acid side chains in the active site play a part in the catalytic mechanism. C) The enzyme ensures...

Rationalize the fact that hydrogen bonding has not been observed between CH4 molecules - Answer The C-H bond is not sufficiently polar for greatly unequal distribution of electrons at its two ends. Also, there are no unshared pairs of electrons to serve as hydrogen bond acceptors What are the requirements for molecules to form hydrogen bonds? - Answer A hydrogen covalently bonded to a O, N or F. This hydrogen then forms a hydrogen bond with another O, N, or F.

The initial effect of insulin binding on muscle cells is the translocation of ____. A) GLUT4 D) adenylate cyclase B) β-adrenergic receptors E) G proteins C) α-adrenergic receptors - Answer A) GLUT4

BCH 369 CHAPTER 7 TEST QUESTIONS WITH ANSWERS ALL REVISED AND UPDATED random mechanism - Answer-A multisubunit reaction without a compulsory order of substrate binding to the enzyme. ordered mechanism - Answer-A multisubunit reaction with a compulsory order of substrate binding to the enzyme. Ping pong mechanism - Answer-An enzymatic reaction in which one or more products are released before all the substrates have bound to the enzyme. allosteric enzyme - Answer-1 cooperativity - A...

diffusion controlled limit - Answer The theoretical maximum rate of an enzymatic reaction in solution, about 10^8 to 10^9 M^-1 * s^-1 catalytic perfection - Answer A state achieved by an enzyme that operates at the diffusion-controlled limit. Lineweaver-Burk plot - Answer A rearrangement of the michaelis menton equation that permits the determination of KM and Vmax from a linear plot.