Module 4 - Effects of Physical Factors on Microbial Growth

What is representative of a typical range that a microbe can live in

• 0-1000 C

• 40 - 45 C

• -20 - 5 C

• 10 - 45 C

Answer explanation

temp range for an organism is usually less than 40 deg C

A microbe live in an environment from 20 to 60 deg C, what is likely their optimum temperature

• 0

• 40

• 20

• 60

• 50

Answer explanation

optimum temp is closer to max than min temp, before that enzymes work too slow, beyond that enzymes denature

What would be the temperature that a mesophile's enzymes would denature?

• 8 C

• 20 C

• 40 C

• 55 C

Answer explanation

enzymes denature past max temp

Which is not an extremophile

• acidophile

• neutrophile

• alkaliphile

• psychrophile

• mesophile

Answer explanation

Which type of extremophile is likely not to survive in room temperatures

• psychrophile

• mesophile

• thermophile

• hyperthermophile

Answer explanation

Which type of microbe can survive in a temperature of 25 deg C

• psychrophile

• psychrotolerant

• mesophile

• thermophile

• hyperthermophile

Answer explanation

What is a characteristic absent in the enzymes of psychrophilic organisms

• greater alpha helices and lesser beta pleated sheets

• lesser alpha helices and greater beta pleated sheets

• greater number of weak bonds

• lesser number of weaker bonds

• more polar amino acids and less hydrophobic amino acids

Answer explanation

cell membrane of a psychrophile

• unsaturated

• saturated

• long chain

• short chain

Answer explanation

cell membrane of a thermophile

• unsaturated

• saturated

• long chain

• short chain

Answer explanation

what structure inhibits mRNA translation in cold temperatures

• primary

• secondary

• tertiary

• quaternary

Answer explanation