Ecdysis is
A. development of the ectoderm layer in the gastrula.
B. development of the epidermis from the ectoderm.
C. disintegration of the ectoderm.
D. molting of the exoskeleton.
E. the feeding tentacles of the Ecdysozoa.
D. molting of the exoskeleton.
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Sister chromatids are separating from each other during:
A) anaphase. B) metaphase. C) prophase. D) telophase.
Viruses infecting protists, including algae, have never been detected.
Answer the following statement true (T) or false (F)
Which of the following best describes the photosynthetic membranes of the purple nonsulfur bacteria?
A. The photosynthetic membranes are not associated with the plasma membrane. B. The photosynthetic membranes are continuous with the plasma membrane. C. The photosynthetic membranes are attached to the plasma membrane but not continuous with it. D. There are no photosynthetic membranes in the purple nonsulfur bacteria.
Biologists categorize the cue that stimulates young herring gulls to peck as a sign stimulus because the pecking
behavior ____.
a. requires learning to perfect b. is a cue released by the baby gulls to their parents c. is triggered by presentation of the cue d. is only triggered by the cue if it is accompanied by species-specific behaviors e. appears both in the presence and absence of the cue