Which of the following organelles will be concentrated in the first pellet produced by differential centrifugation?
a. Mitochondria
b. Nuclei
c. Endoplasmic reticulum
d. The cytosol
Ans: b. Nuclei
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In the mechanism of stomatal opening, after light activates proton pumps which of the following
happens next? a. Guard cells change shape. b. Hydrogen ions are actively transported out of guard cells. c. Potassium ions diffuse into guard cells. d. Chloride ions diffuse out of guard cells. e. Water moves by osmosis into guard cells.
An organism that reproduces asexually produces genetically variable offspring
__________________ Indicate whether the statement is true or false.
The endosymbiont theory is supported by all of the following evidence except for which statement?
A. Mitochondria are surrounded by two membranes. B. Mitochondria have a matrix. C. Mitochondria divide by binary fission. D. Mitochondria contain circular molecules of DNA. E. Mitochondrial ribosomes are similar to bacterial ribosomes.
Members of phylum __________ are the most primitive of the fungi and were previously classified as
protists. a. Chytridiomycota b. Zygomycota c. Glomeromycota d. Ascomycota e. Basidiomycota