An enzyme is thought to optimize the fit between substrates by restraining and stretching or squeezing them into
certain shapes and moving them to the transition state, as described by the ____ model of enzyme activity.
a. lock and key
b. induced-fit
c. template
d. activation
e. conformational
ANSWER: b
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At 4:00 p.m. a closed flask of sterile broth is inoculated with 10,000 cells. The lag phase lasts 1 hour. At 9:00 p.m. the log phase culture has population of 65 million cells. The approximate number of generations that has occurred is
A. 27. B. 13. C. 21. D. 5.
Identify the chemoreceptor(s) important for detecting possible toxic substances.
A. salty B. sweet C. sour D. bitter E. salty and sweet
What is a densely packed group of migratory plankton called?
a. Sonar disruption b. Deep scattering layer c. Holoplankton d. Photic migrators
For natural selection to occur, adaptive traits must be inheritable. This means that change occurs at the level of DNA. Answer the following question with this in mind
a. How do new traits develop? b. How may the genetic changes contribute to evolution by natural selection? c. How can the degree of similarity in DNA or protein sequence be used to infer the degree of relatedness between species?