The D-value at 121°C for a bacterial spore is 2 minutes.

How long (in minutes) will it take to reduce the population from 1 × 10⁶ to 1 cell?

#Question id: 4620

#XL - T Zoology

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

#Question id: 4621

#XL - S Microbiology

DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that

#Question id: 4621

#XL - T Zoology

DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that

#Question id: 4622

#XL - S Microbiology

 Catastrophism, meaning the regular occurrence of geological or meteorological disturbances (catastrophes), was Cuvierʹs attempt to explain the existence of

#Question id: 4622

#XL - T Zoology

 Catastrophism, meaning the regular occurrence of geological or meteorological disturbances (catastrophes), was Cuvierʹs attempt to explain the existence of

#Question id: 4623

#XL - S Microbiology

 Which of the events described below agrees with the idea of catastrophism?