Unit 17 and 18 quiz

What is the importance of monitoring microbial growth?

• To understand the requirements of microbes for different media

• To understand the harmfulness of microbes in the human body

• To limit or stop the growth of microbes in the human body

• All of the above

Which methods can be used to measure cell mass?

• Direct physical method

• Direct chemical method

• Indirect measurement

• All of the above

How can cell numbers be measured?

• Microscopic counts using counting chambers

• Automated counting chambers

• Plate counts

• All of the above

What are common problems encountered in cell culture?

• Poor cell growth

• Abnormal cell morphology

• Poor quality or contaminated materials

• All of the above

What is the principle of visible light measurement?

• Different substances absorb different wavelengths of light

• Absorption of electromagnetic radiation between 180 and 1100 nm

• UV/VIS spectral region

• All of the above

What is the function of a UV-VIS spectrophotometer?

• To measure the way light is absorbed by a compound

• To identify compounds by analyzing the spectrum of wavelengths absorbed

• To determine concentrations of compounds in solution

• All of the above

Which sub-domains does the UV/VIS spectral region include?

• Near UV, Visible, and Very near infrared

• Near UV, Mid UV, and Far UV

• Visible, Infrared, and Ultraviolet

• None of the above

What is the relationship between frequency and energy of light?

• Higher frequency means higher energy

• Lower frequency means higher energy

• Frequency and energy are not related

• None of the above

What is the range of most commercial spectrophotometers?

• 185 to 900 nm

• 400 to 700 nm

• 185 to 1100 nm

• 700 to 1100 nm

How does a UV-VIS spectrometer identify compounds?

• By analyzing the spectrum of wavelengths absorbed

• By measuring the concentration of absorbing compounds

• By comparing data over a required range

• All of the above