A mixotroph loses its plastids yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It relies on photosystems that float freely in its cytosol.
B) It must have gained extra mitochondria when it lost its plastids.
C) It engulfs organic material by phagocytosis.
D) It has an endospore.
E) It is protected by a siliceous case.
Answer: C) It engulfs organic material by phagocytosis.
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If a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble _____
A) respiring B) feeding C) moving D) respiring and feeding E) feeding and moving
An important message from the work of Thomas Malthus that influenced Charles Darwin was
A. animals tended toward "human perfection." B. only a fraction of any population will survive and reproduce. C. population size of humans can only increase linearly. D. inheritance of acquired characteristics. E. none of these. Charles Darwin was influenced by John Ray not Thomas Malthus.
What might be an accurate albedo measure of the surface of a glacier?
A) 0.1 B) 9.0 C) 0 D) 0.9
___________ are spiral-shaped bacteria with wriggly movement caused by the activity of axial filaments.
A) Bacilli B) Cocci C) Spirilla D) Spirochetes