MICRO 425 Name_____________________________
First Exam 22 September 2003
PART I: MULTIPLE CHOICE (80 points; two points per question)
Circle the letter next to the single correct answer.
1. The function of capsular polysaccharides is to:
a) store surplus carbohydrate
b) anchor bacterial cells to the intestinal lining
c) protect against dehydration
d) keep the periplasmic space inflated at low osmotic pressure
e) keep out molecules of greater than 1,000 molecular weight
2. By weight, cells contain more of:
a) ribosomal RNA
b) messenger RNA
c) phospholipid
d) peptidoglycan
e) lipopolysaccharide
3. An organotroph uses organic molecules as:
a) source of reducing power
b) carbon source
c) source of energy
d) all of the above
e) none of the above
4. Prokaryotes differ from eukaryotes as follows:
a) prokaryotes have ribosomes made of 60S plus 40S subunits
b) eukaryotes have a single linear chromosome
c) prokaryotes have several linear chromosomes
d) eukaryotes have a single intron in each gene
e) prokaryotes have a single circular chromosome
5. The phospholipids found in biological membranes differ from fats as follows:
a) phospholipids have three fatty acids plus phosphate
b) phospholipids have three fatty acids plus glycerol
c) fats have three fatty acids plus glycerol
d) fats have two fatty acids, glycerol and glucosamine
e) fats have two fatty acids and two glycerols
6. Isoprenoids differ from the typical fatty acids found in membranes as follows:
a) isoprenoids usually have even numbers of carbon atoms
b) fatty acids are branched
c) isoprenoids are made from five carbon units
d) fatty acids usually have double bonds
e) fatty acids are long enough to cross the whole width of a typical biological
membrane
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