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TLS Online TPP Program

#Question id: 2207

Why was it unexpected that transporter proteins are required for transmembrane fatty acid transport?

#XL - Q Biochemistry

  1. because these molecules are too small for their diffusion to be impeded by membranes

  2. because it is the cytosolic fatty acid binding-protein–fatty acid complex that is the actual transported complex

  3. because these molecules are sufficiently hydrophobic to diffuse across membranes

  4. because triglycerides carried by lipoproteins were thought to be the only source of fatty acids in the circulation

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TLS Online TPP Program

#Question id: 35939

#XL - U Food Technology

A bacterial culture has an initial population of 1Γ—104cells/mL. The population doubles every 30 minutes. What will be the population (in cells/mL) after 2 hours?
TLS Online TPP Program

#Question id: 35940

#XL - U Food Technology

In a batch culture, the specific growth rate (πœ‡) of a microbe is 0.693 h-1. What is the doubling time (in hours) of this organism?
TLS Online TPP Program

#Question id: 35941

#XL - U Food Technology

A microbial population declines from 1Γ—108CFU/mL to 1Γ—104CFU/mL in 30 minutes during thermal processing. Assuming first-order death kinetics, calculate the decimal reduction time (D-value) in minutes.
(Use: 𝑁=𝑁0Γ—10βˆ’π‘‘ / 𝐷)
TLS Online TPP Program

#Question id: 35942

#XL - U Food Technology

A microorganism has a D-value of 5 minutes at 121Β°C. How much time (in minutes) is required to achieve a 6-log reduction at this temperature?
( Time = D Γ— log reduction)
TLS Online TPP Program

#Question id: 35943

#XL - U Food Technology

If the log of microbial count decreases from 6 to 2 in 20 minutes, what is the D-value (in minutes)?
( D = time / log reduction)
TLS Online TPP Program

#Question id: 35944

#XL - U Food Technology

A microbial culture has a lag phase of 2 hours, an exponential phase lasting 4 hours, and a specific growth rate of 0.35 h-1. What is the final cell concentration if the initial cell count at the beginning of exponential phase is 1Γ—105cells/mL? (𝑁=𝑁0 β‹… π‘’πœ‡π‘‘)