BCH4024 F2024 OC E4 Q33: Growth of E. coli is arrested by chloramphenicol treatment. The drug inhibits the peptidyl transferase activity in a ribosome. What is bound to the A, P, and E sites of the targeted ribosome?

If we have an amputated finger, we should place it DIRECTLY on ice, not in a bag or container, to preserve it until we can get to the hospital. 

Your friend is studying mouse fur color and has identified the GPCR responsible for determining fur color, as well as the extracellular signal that activates it. She observes that adding the signal to pigment cells (which produce pigment for fur color) increases cAMP levels. Inspired by this discovery, she starts a biotech company that isolates additional components of the signaling pathway involved in fur color determination. Using transgenic mouse technology, the company creates mice with targeted genetic modifications to investigate the role of specific proteins in fur color. The following results are obtained: a) Normal mice have beige (light brown) fur.b) Mice lacking the extracellular signal have white fur.c) Mice lacking the GPCR have white fur.d) Mice lacking cAMP phosphodiesterase have dark brown fur. Questions Describe the signaling pathway activated to produce beige fur color. Explain the molecular mechanisms underlying results b, c, and d: Result b: Mice lacking the extracellular signal have white fur. Result c: Mice lacking the GPCR have white fur. Result d: Mice lacking cAMP phosphodiesterase have dark brown fur What fur color do you predict for mice with a defective Gs α subunit that cannot hydrolyze GTP? Why? What would be the fur color of mice with defective Gi α subunits that cannot hydrolyze GTP? Why?  

Which of the following correctly describes the relationship between the critical concentration (CC) and the rate of polymerization at the plus and minus ends of actin filaments or microtubules?

One of the biochemical tests performed by the clinical lab on this unknown bacterial sample is shown in the photo. This test was incubated at 37 degrees Celsius for 30 hours.  What does this tell you about the metabolism of this specimen?  (select all that apply)  

Solve the equation.5x – (4x – 1) = 2

Graph the linear equation.x = -2

Write an equation for the line passing through the given pair of points. Give your final answer in standard form.(2, 4) and (4, 6)

Solve the equation.0.34(50) + 0.6x = 0.5(50) + 0.5x

Solve the equation.x    x = 3