ExamI_Fall2007_key - Name:_ CH339K EXAM I Fall 2007 UT EID:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Name:____________________________________ UT EID: ______________________ CH339K EXAM I Fall 2007 Prof. Marcotte ** SHOW WORK FOR COMPUTATIONAL PROBLEMS OR NO CREDIT!! ** Useful constants: R = 0.0821 L · atm/mol · K N = 6.022 x 10 23 /mol 5pt (1a) A typical yeast cell is roughly spherical with an approximate diameter of 5 microns (5 x 10 -6 m). Such a cell contains about 4 × 10 -12 g of protein. If you assume a typical protein molecular weight of 50,000, how many total molecules of protein are there in a typical cell? Show your calculations or no credit given . (4 × 10 -12 g of protein)*(1 mol / 50,000 g protein)*(6.022 x 10 23 molecules/mol) = 5x10 7 molecules / cell (A) 1 x 10 16 protein molecules / cell (B) 8 x 10 10 protein molecules / cell (C) 5 x 10 8 protein molecules / cell (D) 5 x 10 7 protein molecules / cell Correct answer = D (E) 2 x 10 6 protein molecules / cell 5pt (1b) The yeast genome contains genes encoding roughly 6,000 unique protein species. Assume that only about 5,000 of these protein species are expressed at any given time (we don’t yet know the fraction of expressed proteins, but this is probably not too far off). Given your answer above, how many molecules per cell, on average, of each protein species are present? (5x10
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/30/2009 for the course CH 55655 taught by Professor Marcotte during the Spring '09 term at University of Texas at Austin.

Page1 / 4

ExamI_Fall2007_key - Name:_ CH339K EXAM I Fall 2007 UT EID:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online