Lysosomes digest intracellular debris, such as organelles, through the process of ____________.
A. endocytosis
B. phagocytosis
C. autophagy
D. pinocytosis
E. excocytosis
C. autophagy
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The first step of the scientific method is to
(a) ask a question. (b) construct a hypothesis. (c) observe carefully. (d) formulate a prediction.
Which of the following eukaryotic RNA polymerases is responsible for transcribing ribosomal RNAs (rRNAs)?
A. RNA Pol I B. RNA Pol II C. RNA Pol III D. RNA Pol I and RNA Pol III E. RNA Pol II and RNA Pol III
Activities associated with the parasympathetic division of the autonomic nervous system include
A. resting and digesting. B. release of both acetylcholine and epinephrine. C. increased heart rate. D. "fight-or-flight" response. E. release of epinephrine only.
Some flowers have distinctive patterns that only reflect ultraviolet light and therefore are invisible to humans. Which statement about such markings is NOT correct?
A. The ultraviolet patterns are highly visible and attractive to bees. B. Carotenoid pigments are responsible for the ultraviolet patterns. C. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites. D. The ultraviolet patterns repel birds and bats from the flowers. E. Flowers with ultraviolet patterns usually appear yellow or orange to humans.