Chapter 7
what is the range for pipettes
-P1000: 200-1000ul -P200: 20-200 ul -P20: 2-20 ul
Have a look at the BSA scatter plot in the second tab. What is the range of absorbance values measured for the BSA standard
0.08-0.65
what was the original concentration in the BHL sample, if the dilution is 1:500 and the conentration
35 mg
In table 12.1 which of these spores are characteristic of Rhizopus
7-8
Which of the following statements about algae is false?
All are unicellular
The Bradford assay only works at low protein concentrations (from 0.05 to 0.5 mg/mL protein) How can we reduce the concentration of protein in our sample.
Dilute the sample
Bacterial predators such as Bdellovibrio are members of the betaproteobacteria.
False
The human body is typically free of archaeal species
False
Which of the following statements regarding fungi is false
Most fungi are pathogenic for humans
Seventeen patients in ten hospitals had cutaneous infections caused by Rhizopus. In all 17 patients, Elastoplast bandages were placed over sterile gauze pads to cover wounds. Fourteen of the patients had surgical wounds, two had venous line insertion sites, and one had a bite wound. Lesions present when the bandages were removed ranged from vesiculopustular eruptions to ulcerations and skin necrosis requiring debridement. Fungi are more likely than bacteria to contaminate bandages because
They can tolerate low-moisture conditions
Which of the following bacteria is gram-negative
Treponema
Why are only sterile pipeete tips used in the lab
avoid contamination of sample
What do you need to do next before pipetting a different sample
discard the tip
The nonsulfu photosynthetic bacteria use organic compounds as
electron donors to reduce CO2
Which of the following is the most effective control for malaria
eliminate anopheles
The insect vectors have six legs and include ticks, mosquitoes, and lice.
false
Which of the following arthropods does NOT transmit diseases by sucking blood from a human host?
houseflies
Burkolderia was reclassifed from the gammaproteobacteria to the betaproteobacteria because
its rRNA sequence is similar to that of neisseria
Mycoplasmas differ from other bacteria in that they
lack a cell wall
Actinomycetes differ from fungi in that actinomycetes
lack a membrane bounded nucleus
Giardia and Trichomonas are unusual eukaryotes because they
lack mitochondria
Which of the following statements regarding protozoa is falze
nearly all protozoa cause disease
Borrelia is classified as a spirochete because it
possesses an axial filament
Which one of the following bacteria does not belong with the others
salmonella
Which of the following bacteria are responsible for more infections and more different kinds of infections
streptococcus
The cell of plasmodial slime molds can grow to several centimeters in diameter because
they distribute nutrients by ctyoplasmic streaming
Why did you press the plunger all the way down to the second stop
to push out the remaining fluid from the tip