Which of the following characteristics are shared by animals and fungi? Check all that apply.
_____ cell walls
_____ derived from protists
_____ autotrophic
_____ absorptive nutrition
_____ secrete digestive enzymes
_____ cell walls
__X__ derived from protists
_____ autotrophic
__X__ absorptive nutrition
__X__ secrete digestive enzymes
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Oxygen has an atomic mass of 16 and an atomic number of 8.
A. Oxygen has 16 neutrons. B. Oxygen has 8 electrons. C. Oxygen can form two bonds with other atoms. D. Oxygen has 16 neutrons and 8 electrons. E. Oxygen has 8 electrons and can form two bonds with other atoms.
Precautions that can be taken by individuals to prevent travel-related infectious diseases include
A. wash hands with soap and water frequently. B. wash hands with soap and water frequently, get or update vaccinations appropriate for specific destinations, and take antibiotics prophylactically for potential bacterial infections. C. wash hands with soap and water frequently and get or update vaccinations appropriate for specific destinations. D. get or update vaccinations appropriate for specific destinations. E. take antibiotics prophylactically for potential bacterial infections.
Mechanical isolation may occur when two species have different:
A) sized and shaped copulatory organs B) courtship displays C) times of the day that they are sexually active D) habitat ranges E) chemical compatibilitie of their gametes
Which of the following statements about allosteric proteins is/are true?
a. they are sensitive to environmental conditions b. they are acted on by inhibitors c. they exist in active and inactive conformations d. all of the above are correct e. none of the above are correct