Reproduction in sponges includes all except:
a. budding.
b. sexual.
c. fragmentation.
d. cloning.
D
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Which of the following may be associated with nosocomial disease?
A. Enterococcus species. B. Clostridium difficile. C. Pseudomonas species. D. Staphylococcus aureus. E. All of the choices are correct.
In this representation of transcription, strand #
____ is ____ because it ____.
a. 2; RNA; is double-stranded b. 3; RNA; contains uracil c. 2; RNA; contains thymine d. 2; RNA; has no uracil e. 3; DNA; contains adenine
Based on your understanding of the ways in which signal transmission mediates cell function, which of the following predictions is most consistent with the information given above?
(A) In an environment with low fixed nitrogen, treating the Anabaena cells with a calcium-binding compound should prevent heterocyst differentiation. (B) A strain that overexpresses the patS gene should develop many more heterocysts in a low fixed nitrogen environment. (C) In an environment with abundant fixed nitrogen, free calcium levels should be high in all cells so that no heterocysts develop. (D) In environments with abundant fixed nitrogen, loss of the hetR gene should induce heterocyst development.
Which human body system includes lymphatic organs of the lymphatic network, such as the tonsils and lymph notes?
A) nervous B) cardiovascular C) endocrine D) urinary E) immune