Practice Final.docx - Final Exam Practice Test 1 2 3 4 5 6 7 8 Which of the following statements best describes the principle of staining bacteria with

Practice Final.docx - Final Exam Practice Test 1 2 3 4 5 6...

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Final Exam Practice Test 1.Which of the following statements best describes the principle of staining bacteria with basicdyes? a.Bacterial cell envelopes have no charge and allow basic and acidic stains to stain the bacteria equally wellb.Bacterial cell envelopes are positively charged and repel the positively charged basicstainsc.Bacterial cell envelopes are negatively charged and repel the positively charged basic stainsd.Bacterial cell envelopes are negatively charged and attract the positively charged basic stainse.Bacterial cell envelopes are positively charged and attract the negatively charged basic stains. 2.Which best describes competitive inhibition? 3. You are asked to sterilize a Nichrome wire inoculating needle that is used to transfer bacterial cultures in the lab. Which methods could not be used to sterilize it? a. Autoclaving for 20 min at 121C and 15psi b. Ethylene oxide for 18 hrs c. Soaking in 2% glutaraldehyde solution for 15 min d. Incineration in a Bunsen burner flame e. Baking for 2 hours at 180C 4.How will the lac operon be affected by high levels of glucose even if lactose is present? 5. PCR involves the a. Production of recombinant DNA b. Amplification of a few copies of a gene into large number of copies c. Use of transgenic mice d. Use of DNA sequencing 6.Which contribution is not attributed to Louis Pasteur? 7.Which technique is best for sterilizing a glass test tube? a.Ethylene oxide for 20 minb.Baking at 160C for 20 minc.Immersion in 2% glutaraldehye solution for 10 mind.Boiling for 15 mine.Autoclaving for 20 min at 121C and 15psi
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