{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# Quiz 4 - Lightr Can m In Hu— 4 r-rr any Bio 221 Name...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lightr Can. m. In: Hu— 4. r.,-rr any Bio 221 Name Keg (Please PRINT clearly) Quiz 4 1. What equation would you use to solve the following problem: 7 How long would it take to reach stationary phase in a liter of culture (1012 cells) inoculated with a single colony (105 cells), if the bacterial growth rate is 1.2 per hour? A. 1.2=(1012/105)ex N= ,\l a” B. 105=(10‘2) (1.2x) ‘ 5 C. 1012: 1.2xe10 IO“ - ro‘e D. 1012 = 105 e” x / 5 ‘ E. 1012/1.2=e10 X M .4», le all; /‘ 2_. Which of the following would be considered a Viable Cell Count method? i A. Most Probable Number method L. WU» M 32:0 (H . B. Petroff-Hausser Chamber - (brat We ( Lu—rémé} C. Turbidity (OD) measurement - Ame! w“. mi.» lrg ht, 4w . D. Coulter Counter - direct M (M Wu» ,~,,J.m~,r; t4». flaw/Jaw) E. Weighing the cell pellet from a bacterial culture - 59% [M ,, M WUL A.» m». 3. The decimal reduction time for disinfecting a Staphylococcus-contaminated steel countertop with 500 ppm chlorine bleach is 2 minutes. Which of the following would decrease the decimal reduction time? (9.4-le -— (u) lot) ’l place: 6. “A1..." 2. e mew— rm. it. swarm: ,. My»: ’7 A. using a quaternary ammoni deter ent rather than chlorine bleach /‘ B. disinfecting a rough surfa e such as a sieve or screen instead of smooth 5 e1 C. disinfecting a greasy surface such as a dish drain instead of a countertop D. disinfecting a suxtgce contaminated with Mycobacteria rather than Staphylococcus E. using 5000 ppm hlorine bleach rather than 500 ppm—ﬂ "M‘i “‘ id" (“"7 {”7”} damkd‘zmi‘: Hut/(4 [L53 'v-l’kdm— with 5m. 4. A mouthwash called “Hexodent” lists the following ingredients: 8% alcohol, 0.2% u—r chlorhexidine, mint ﬂavor. How does this mouthwash kill bacteria? f 2 "wt, 60—232. I not 7% A. The alcohol denatures proteins. B. The alcohol damages DNA. --9 W 4"“ f ”‘9'“ M ”“7 ‘1. ("W7 W C. The chlorhexidine dissolves cell membranes. L d d» M D. The chlorhexidine cross-links and rigidities proteins. A 01‘“ V ‘5 E. hlorhexidine + ethyl alcohol —> ethylene oxide, which oxidizes DNA. ”MMAL rude-v»; Ema“ cute mum‘s 4., new ‘7 4 ”“1““ CM 5. Which of the following correctly describes a non-competitive enzyme inhibitor? 3“ ~ A. It binds to the active site of the enzyme. / “7,9 at ”A; B. Even very low concentrations of it caninhibit an enzyme. iii-av. C. It must at least partially resemble the structure 0 t enz me’s normal substrate. "' D. It must be a product of the reaction catalyzed by the enzyme. E. It attaches Wm the enzyme. \ M~'H\.r 67/“, M31: In 4 {mm 8. MM ﬁ/w cut-(ulna “mtg/(rt? ﬂea m wt. in WwMWkal’l Ii it‘s A ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online