Which of the following organisms are characterized by having glassy cell walls that contain silica?
A. diatoms
B. amoebas
C. slime molds
D. dinoflagellates
A. diatoms
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The Y chromosome
A) forms the somatic cells. B) is a sex chromosome. C) contains discontinuous DNA sequence. D) is present in all humans.
The skeletons of radiolarians contribute to biogenous sediment that is called:
a. diatomaceous ooze. b. calcareous ooze. c. manganese ooze. d. siliceous ooze. e. hydrogenous ooze.
What phrase best describes the field of epidemiology?
A. It is the study of factors that control the presence or absence of disease. B. It is the study of infectious disease. C. It is a direct and experimental science. D. It begins with laboratory studies on experimental animals. E. It is none of these.
How does the structure of lymphatic capillaries differ from that of capillaries of the circulatory system?
What will be an ideal response?