PRE-CLASS QUESTIONS for Week #7
(individual; open book; turn in July 01, 2008)
(lose 20% if turned in on July 02; lose everything if turned in later!)

Grades will be curved providing you correctly answer at least 2 of these:
Put your answers on the answer sheet.

1. Bacterial chromosomes:
(a) are linear portending those of eukaryotes
(b) are composed of double-stranded DNA (dsDNA)
(c) need bacteriophages to help them replicate
(d) can be detected with the tincture of iodine (aqueous KI₃)
(e) all of the above
4. Specific immunity is embodied in
(a) serum complement
(b) gamma-globulins
(c) variable regions of heavy and light proteins (part credit)
(d) serum albumin
(e) all of the above
(f) b and c only
(g) a and d only

2. A prokaryotic operon is
(a) an artifical designation indicating a length of DNA that is 10,000 bases long
(b) a cluster of one or several genes that can be turned "on" and "off" in unison depending on circumstances
(c) is the opposite of an integron
(d) is composed of RNA
(e) two of the above
(f) none of the above
5. A bacterial strain with a simple nutrition can grown on
(a) nutrient agar
(b) tryptic soy agar
(c) glucose, mineral salts and water
(d) often in the absence of light
(e) all of the above
(f) only two of the above (not counting "e")

3. The "transforming principle"
(a) was NOT shown to be DNA
(b) was NOT first discovered in pneumococcus (Strep pneumoniae)
(c) was NOT researched by Avery, Griffith, MacCleod and McCarty
(d) was NOT researched by Embden, Kornberg, Krebs, Meyerhof, and Parnas*
(e) both a and b
(f) all of a, b, c and d
* These people elucidated basic metabolism in yeast. 6. Many types of bacteria secrete enzymes into the medium
(a) so as to degrade large molecules into ones small enough to be transported into their cells as food (part credit)
(b) which can be assayed using reagents that cause halos to become visible around those colonies (part credit)
(c) because in their simplicity, bacterial envelopes are "leaky" and the enzymes diffuse out and escape
(d) to protect themselves from harmful substances in their environments (part credit)
(e) all of the above
(f) only two of the above a, b, c and d
(g) only three of the above a, b, c and d

	1. Bacterial chromosomes: (a) are linear portending those of eukaryotes (b) are composed of double-stranded DNA (dsDNA) (c) need bacteriophages to help them replicate (d) can be detected with the tincture of iodine (aqueous KI₃) (e) all of the above			4. Specific immunity is embodied in (a) serum complement (b) gamma-globulins (c) variable regions of heavy and light proteins (part credit) (d) serum albumin (e) all of the above (f) b and c only (g) a and d only
	2. A prokaryotic operon is (a) an artifical designation indicating a length of DNA that is 10,000 bases long (b) a cluster of one or several genes that can be turned "on" and "off" in unison depending on circumstances (c) is the opposite of an integron (d) is composed of RNA (e) two of the above (f) none of the above			5. A bacterial strain with a simple nutrition can grown on (a) nutrient agar (b) tryptic soy agar (c) glucose, mineral salts and water (d) often in the absence of light (e) all of the above (f) only two of the above (not counting "e")
	3. The "transforming principle" (a) was NOT shown to be DNA (b) was NOT first discovered in pneumococcus (Strep pneumoniae) (c) was NOT researched by Avery, Griffith, MacCleod and McCarty (d) was NOT researched by Embden, Kornberg, Krebs, Meyerhof, and Parnas* (e) both a and b (f) all of a, b, c and d * These people elucidated basic metabolism in yeast.			6. Many types of bacteria secrete enzymes into the medium (a) so as to degrade large molecules into ones small enough to be transported into their cells as food (part credit) (b) which can be assayed using reagents that cause halos to become visible around those colonies (part credit) (c) because in their simplicity, bacterial envelopes are "leaky" and the enzymes diffuse out and escape (d) to protect themselves from harmful substances in their environments (part credit) (e) all of the above (f) only two of the above a, b, c and d (g) only three of the above a, b, c and d