Which of the following is NOT true of spindles?
a. They are permanent cell structures.
b. Centrosomes act as microtubule originating
centers for spindles.
c. Some of their microtubules overlap at the
cell equator.
d. Tubulin is the main component.
e. They are bipolar in their configuration
A
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Reactive oxygen species are detoxified by a general category of molecules referred to as ____
Fill in the blank with the appropriate word.
Which of the following is an example of a mutualistic association involving a fungus?
A. Fungal hyphae penetrate a plant root and provide the plant with nutrients and receive organic molecules in return. B. Fungal spores infect and then eventually kill an insect. C. A fungus produces rings that allow it to capture and feed upon nematode worms. D. A fungus invades the xylem of a tree and eventually kills it. E. A fungus causes Athlete's foot in a human.
A walled, immature male gametophyte is called a ____
a. spore b. pollen sac c. zygote d. sporophyte e. pollen grain
Based on the currently accepted theories for the evolution of eukaryotic cells, which of the following cell structures currently found in green algae evolved by modification of the plasma membrane of an ancestral cell?
A. The nuclear envelope B. The endoplasmic reticulum C. The outer membrane of mitochondira D. The outer membrane of chloroplasts E. Answers A and B F. Answers B and C G. Answers A, B, and C H. Answers A, B, C, and D