Author: Anonymous

Which of the following is FALSE about the genetic code?

The COVID-19 mRNA vaccine contains mRNA for the spike protein of the COVID-19 virus. After vaccination, the mRNA goes into your muscle cells. What will your muscle cell do with this mRNA?  

Ramon estudia literatura y va a ser profesor.

10. In this problem you will design a series of decoder devices. a) Draw a functional block diagram for a 1-to-2 decoder with active-high input X, active-low  outputs Ya, an active-low enable (labeled E1) and an  active-high enable (labeled E2). These are NOT a tri-state enables. Use the normally used subscripts for the two Y outputs (Y0 and Y1). b) Draw a functional block diagram for a 2-to-4 decoder with active-high inputs Xa, active-low  outputs Yb, an active-low enable (labeled E1) and an  active-high enable (labeled E2). These are NOT a tri-state enables. Use the normally used subscripts for the two X inputs (X0 and X1) and the four Y outputs (Y0 through Y3). c) Draw a functional block diagram for a 3-to-6 decoder with active-high inputs Xa, active-low  outputs Yb, and no enable. Use the normally used subscripts for the three X inputs (X0 through X2) and the six Y outputs (Y0 through Y5). d) Design a 3-to-6 decoder using one 1-2 decoder and the minimum number of 2-to-4 decoders (as drawn in parts a and b) and no other device(s). (If necessary, also use SSI gates for much less credit.) e) How can you modify the circuit in part d to give the 3-to-6 decoder an active-low enable, G(L)? Add this new circuit IN A BOX to your previous solution to part d.  

For most of you, your exam is over at 4:00pm. At the latest, five minutes BEFORE your exam is over (at 3:55pm, for most of you), do the following: Clearly label exam problem numbers and scratch paper page numbers. Use your cell phone to scan the scratch pages that you used (using Adobe Scan or equivalent), to create a single PDF file. Be sure to scan ALL of the pages that you wrote on (including both sides of your paper, if you wrote on both sides). Pages not scanned will not be graded! When you finish scanning, open the file on your phone to be sure that it has what you want and that each page is clear. If not, rescan. Open the Canvas assignment Ex1 PHONE (u26) on your cell phone. Upload your single PDF file to the Ex1 PHONE (u26) assignment and submit it to THAT assignment. Submit the Honorlock assignment on your computer, Ex1 (u26), by selecting the “Submit Quiz” at the bottom of THIS assignment. Close your Zoom session and relax … the exam is over!

1.  Solve the following arithmetic problems.  Remember to show ALL work for this problem and and EVERY problem on this exam. a) Determine the unsigned hexadecimal, octal, binary, and BCD representations of the number 47310.  (I strongly recommend that you check your work before moving on to the next part of this problem.) Use scratch paper for this and ALL problems on this exam. Remember to show ALL work for this problem and EVERY problem on this exam. Label each problem with the problem number, e.g., for this problem use  1. a) . Do NOT put ANYTHING in the box at the bottom of this problem (and similar boxes at the bottom of each of the problems). b)  Determine the 10-bit signed magnitude, 1’s complement, and 2’s complement representations of the decimal number -47310.  (I strongly recommend that you check your work before moving on to the next problem.) c)  What is 25610 minus 47310, i.e., 25610 – 47310 in 10-bit 2’s complement? You must use binary numbers to derive and determine the solution (not decimal).  Hint: 256 = 28. You must show all work. d) What is 48010 – 47310 in 10-bit 2’s complement? You must use binary numbers to derive and determine the solution (not decimal).  Hint: 480 = 28 + 27 + 26 + 25. You must show all work.

Evaluate the following question and answer choice, then select the *BEST* explanation below. An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the “environment,” as shown below. The membrane is permeable to water and to the simple sugars glucose and fructose but impermeable to the disaccharide sucrose. Identify the correct net movement of solutes into and/or out of the cell (labeled with solid arrows) and the net osmosis (labeled with dashed arrows).(b) Option (b) is incorrect because:

Evaluate the following question and answer choice, then select the *BEST* explanation below. An artificial “cell” consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the “environment,” as shown below. The membrane is permeable to water and to the simple sugars glucose and fructose but impermeable to the disaccharide sucrose. Identify the correct net movement of solutes into and/or out of the cell (labeled with solid arrows) and the net osmosis (labeled with dashed arrows).(d) Option (d) is incorrect because:

Evaluate the following question and answer choice, then select the *BEST* explanation below. Which of the following is a trait of mitochondria?(a) they have their own DNA.(b) they are surrounded by a single membrane.(c) proteins are synthesized on ribosomes in the rough ER.(d) they reproduce by meiosis. Option (a) is correct because:

Why is bulk transport, such as endocytosis and exocytosis, considered active transport?  (Select the *BEST* option.)