To allow cell wall extension with new peptidoglycan during cell division, preexisting peptidoglycan is severed using ________ to cleave the ?-1, 4 glycosidic bonds
a. autolysins
b. crescentins
c. transglycosylases
d. both autolysins and transglycosylases
Answer: A
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Over the last 400,000 years, how have atmospheric CO2 levels changed? Select all that apply
A. Atmospheric CO2 levels have remained the same. B. Atmospheric CO2 levels have been steadily increasing overall. C. Atmospheric CO2 levels have been steadily decreasing overall. D. Atmospheric CO2 levels have fluctuated periodically.
What type of thinking is required?
What will be an ideal response?
On a road trip in the American West, you see a prairie dog town – a colony of related animals. There are hundreds of prairie dogs, but only a subset are scanning for predators at any time. If a predator is spotted, a prairie dog barks to warn the rest of the colony, who dart into their burrows. Prairie dogs have a complex vocabulary of alarm calls, which differ to indicate hawks, coyotes, or humans. What feature of group living is best illustrated by the prairie dog alarm system?
A. the many-eyes hypothesis B. the geometry of the selfish herd C. reciprocal altruism D. haplodiploidy E. optimality theory
The ____ a photon’s wavelength, the ____ its energy
a. shorter; greater b. longer; greater c. shorter; less d. longer; more variable e. shorter; more variable