Noneukaryotic cells have
A. chloroplasts.
B. ribosomes.
C. endoplasmic reticulum.
D. nuclear membranes.
B. ribosomes.
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The peripheral chromatin, which contains fine granules that are uniform in size and are evenly distributed, can be found in which one of the following protozoa?
a. Endolimax nana b. Iodamoeba butschlii c. Entamoeba coli d. Entamoeba histolytica
All of the following are examples of prezygotic genetic isolating mechanisms EXCEPT:
a. Male fireflies of different species have different flash patterns. b. Three closely related orchid species flower on different days. c. The progeny of a cross between two different lizard species fail to develop properly. d. One species of snake lives in water and another is terrestrial. e. Peeper frogs mate in April, and tree frogs mate in June.
Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown that after the bacteria enter the root, cells of the root cortex begin to divide. What is this a response to?
a. to a flavonoid released by soybean roots b. to nod gene products produced by soybean roots c. to nod gene products produced by the bacterium d. to nitrogen fixation by the bacterium
All viral hemorrhagic fever outbreaks have been confined to the Eastern Hemisphere
Indicate whether the statement is true or false