In animal cell culture, a CO2 enriched atmosphere in the incubator chamber is used to maintain the culture pH between 6.9 and 7.4. Which one of the following statements is correct?
A. Higher the bicarbonate concentration in the medium, higher should be the requirement of gaseous CO2
B. Lower the bicarbonate concentration in the medium, higher should be the requirement of gaseous CO2
C. Higher the bicarbonate concentration in the medium, lower should be the requirement of gaseous CO2
D. CO2 requirement is independent of bicarbonate concentration in the medium
Answer: Option A
What is the primary purpose of neomycin in creating mice with knockouts in gene X?
A. Neomycin selects for the survival of embryonic stem cells (ES) that have incorporated the mutant gene X anywhere in the genome
B. Neomycin selects for the survival of ES cell that have incorporated the mutant gene in the place of the wild-type gene
C. Neomycin prevents Candida infection during ES cell culture that does not have gene X
D. Neomycin makes the gene X knock-out mice resistant to Candida infection
A. Remove large proteins
B. Remove collagen only
C. Remove mycoplasma and microorganisms
D. Remove foaming agents
A. Hold the pH at 5.6
B. Hold the pH at 7.5
C. Add calcium salt first and then phosphate source
D. None of the above
To create a transgenic organism:
A. Introduce foreign DNA into a gamete or fertilized ovum
B. Inject a gene of interest into a somatic cell
C. Inject a gene of interest into several somatic cells
D. Introduce foreign DNA into somatic cells in culture and transplant them
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