CCR5 that plays a role in inflammatory response. Unfortunately, this protein is also a key to human immunodeficiency virus (HIV) infection. The virus binds to a loop of the CCR5 protein and then enters the cell. Some people have an allele called Δ32 at the CCR5 locus in which 32 bp are deleted. The missing part of the gene codes for the loop in the protein to which the virus attaches. Which statements is true for CCR5?

#Question id: 3048

#Unit 2. Cellular Organization

 If a bacterium regenerates from an endospore that did not possess any of the plasmids that were contained in its original parent cell, the regenerated bacterium will probably

#Question id: 3049

#Unit 2. Cellular Organization

E. coli cells typically make most of their ATP by metabolizing glucose. Under the conditions of this experiment, what should be true of E. coliʹs generation time

#Question id: 3050

#Unit 2. Cellular Organization

Agar is well suited as a solidifying agent because

A. it has been melted in boiling water

B. it can be cooled to about 40 to 42°C before hardening

C. it will not melt again until the temperature rises to about 80 to 90°C.

D. most microorganisms cannot degrade it.

#Question id: 3051

#Unit 2. Cellular Organization

You have 10^10 cell/L of bacterial stock solution. To prepare 1 liter of growth medium containing 1000 bacteria, the volume in microlitre of this stock solution that should be added is

#Question id: 3052

#Unit 2. Cellular Organization

How many average CFU will form on petriplate if 0.1ml sample plating from 104 diluted sample (original sample contain 3x10^7 bacteria per ml)

#Question id: 3053

#Unit 2. Cellular Organization

Bacterial culture contains 1000/ mL in the exponential growth phase. If you consider a generation time of 20 minutes, the total number of organisms / mL 60 minute will be