Ferns often have small bumps called sori arranged in rows on their undersides. What are these structures?
A) Spore capsules
B) Seed capsules
C) Nodules containing symbiotic bacteria
D) Parasites
A
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Recent evidence suggests that hydrogenosomes and mitochondria evolved from different endosymbiotically derived organelles.
Answer the following statement true (T) or false (F)
In a long term study by the evolutionary biologists Endler and Reznick, they illustrated the effect of predation on life history traits by studying guppies with different predators: cichlids and killifish. The killifish preys mostly on immature, smaller guppies and cichlids pursue mature, larger guppies. They noticed that in river portions with only killifish, the guppies were larger than in
river portions with only cichlids. In an experiment, the researchers put the smaller guppies that had previously lived only with cichlids (which eat large guppies) in a river portion that only had killifish (which eat smaller ones). a. What did they observe over the course of eleven years? b. What do you predict would happen if they performed the opposite experiment and mixed guppies from killifish river portions to a river with only cichlids?
Which of the following best describes cnidarians?
A. They have radial body symmetry, tissues, and stinging cells. B. They are asymmetrical and have tissues and stinging cells. C. They have radial body symmetry, lack tissues, but have stinging cells. D. They have radial body symmetry and tissues but lack stinging cells.
Which of the following is a passive mechanism used to move materials into and out of of the cell?
A. phagocytosis B. facilitated diffusion C. active transport D. feedback inhibition E. exocytosis