Which of the following is not a characteristic of a prokaryote?
A. Its DNA is not encased in a membrane.
B. It has a cell wall made of peptidoglycans or other distinct chemicals.
C. It does not have membrane-bound organelles.
D. Its DNA is wrapped around histones.
E. All of these are characteristics of prokaryotes.
Answer: D. Its DNA is wrapped around histones.
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If excessive growth hormone secretion occurs during adulthood, the result is called ____
a. Laron syndrome b. gigantism c. dwarfism d. acromegaly e. rhGH
An advantage that simple multicellular eukaryotes have over single-celled organisms is the ability:
A. of the cells in the multicellular organism to communicate with one another. B. of the cells in a group of cells to avoid predation. C. for autotrophic cells in the multicellular organism to supply heterotrophic cells with nutrients. D. to respond the external environment more efficiently.
Which of the following structures contains high pressure baroreceptors?
A) aortic arch only B) carotid sinus only C) right atrium only D) both the aortic arch and carotid sinus E) aortic arch, right atrium, and carotid sinus
All of the following are correct about the autoclave, except
A. the duration of the process depends on how full the chamber is. B. it is the temperature that kills the microbes, not the pressure by itself. C. it is important not to overload the chamber. D. it is effective for sterilizing powders, oils, and waxy substances. E. sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures.