second miterm exam draft

second miterm exam draft - BIOL300 Cell Physiology Winter...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
BIOL300 Cell Physiology Winter 2007 Second Midterm Exam Monday Feb. 26, 2007 Instructor: Mike Chao, Ph.D. Name:____________________________________ Student ID:______________________________
Background image of page 1

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

View Full DocumentRight Arrow Icon
Part A. True/false questions (60 points, 6 points each) Answer "true" or "false" in the space provided. If you answer "false", you must correct the statement to make it true for full credit. Example: (false) The sky is green. grass ( ) 1. The large ribosomal subunit, bound to the initiator tRNA and various initiation factors, scans mRNA for a start codon. ( ) 2. Phospholipids are zwitterionic molecules that are simultaneously positively and negatively charged. ( ) 3. Multiple drug resistance (MDR) genes confer drug resistance to cells because they encode enzymes that can hydrolyze and degrade drugs. ( ) 4. The Na + gradient is the major contributor to the membrane resting potential. ( ) 5. The signal recognition particle (SRP) binds to the signal peptide of a newly translated polypeptide. In turn, the SRP binds directly to the protein translocation channel Sec61, bringing the mRNA and ribosome to the rough ER. ( ) 6. SNARE complex activation is triggered by Ca 2+ . Activated SNARE complexes are thought to cause vesicle fusion. ( ) 7. Voltage-gated Na + channels (VGSCs) are only found in the axon hillock and axon, not in the dendrites or the cell body. ( ) 8. The critical concentration (Cc) of the (+) end of microtubules is less than the Cc of the (-) end. ( ) 9. Microtubule associated proteins (MAPs) can affect the morphology of axons by influencing microtubule spacing. ( ) 10. α helices are the most common type of transmembrane domain in proteins. 2
Background image of page 2
Part B. Multiple choice questions (70 points, 7 points each) Write your answer in the space provided. Do not circle your answer ! ( ) 11. A ribosome is bound to an mRNA that codes for a hypothetical three amino acid polypeptide. For the purposes of discussion, we will say that the amino acid sequence of this polypeptide (from N terminal to C terminal) is methionine-leucine- threonine (Met-Leu-Ser). Arrange the following events during translation in the correct order: i. Met-tRNA enters the ribosomal P site.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/17/2008 for the course BIOLOGY 3000 taught by Professor Dr.chao during the Spring '08 term at CSU San Bernardino.

Page1 / 8

second miterm exam draft - BIOL300 Cell Physiology Winter...

This preview shows document pages 1 - 4. Sign up to view the full document.

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