Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms. Which of the following responses would you most expect to be lacking from these plants?
A) gravitropism
B) photoperiod
C) thigmotropism
D) phototropism
A
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Select that statement that reflects evidence that directly supports the endosymbiotic theory.
A. Lysosomes contain their own DNA in the form of plasmids. B. The electron transport system is located in the cell membrane in bacteria, while in eukaryotes it is located in the mitochondrial cristae. C. Enzymes for photosynthesis are found embedded in membranes of the Golgi apparatus. D. Glycolysis occurs in the cytoplasm of bacterial cells.
Recovery from a mass extinction requires about how
long? a. 100,000 years b. none of these because recovery is never possible c. about as long as the extinction required d. less than one million years e. at least 10 million years
What is the name of the Drosophila multinucleated cell formed early in development?
A) syncytium B) blastocoel C) mMeristem D) homeobox E) blastoderm
Human brains today are about three times the size of the brains of the earliest hominids
a. true b. false