SQ03_Lect_7_8 - BioMI 290 8 February 2008 Study Questions...

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

View Full Document Right Arrow Icon
BioMI 290 8 February 2008 Study Questions #3 Lectures 7, 8 Part I: CELL ENVELOPE STRUCTURE 1) At right is another diagram of a prokaryotic cell envelope. a) Does this show a Gram (+) or Gram (-) type cell envelope? How can you tell? b) Describe the process a small molecule like a sugar would go through to get from the outside to inside the cell. Consider the following questions: Which layers are permeable to it? Which layers require proteins for passage? Are these transport processes specific or general? c) Where would you expect to find the following proteins (point it out on the diagram)? enzymes that break huge polymers like cellulose into smaller units like sugars enzyme that synthesize cross-linkages between tetrapeptides enzymes that allow specific nutrients into the cell enzymes that bind to DNA during replication d) How would you have to change this diagram to make it look like a Gram (+) cell envelope? e) Look at the Bacterial Domain of the SSU rRNA phylogenetic tree. Do most cells have this type of envelope or do they have the Gram (+) type? Which do you think evolved first? Why? 2) Explain why certain antibiotics like penicillin and vancomycin, which inhibit peptidoglycan synthesis, do not harm human cells. Why would these antibiotics not harm Archaeal cells either? 3) List the salient structural and chemical components of
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.

Page1 / 4

SQ03_Lect_7_8 - BioMI 290 8 February 2008 Study Questions...

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