You are in a lab studying a new cell type that has been discovered. You observe a rigid cytoskeleton in this cell, along with a nucleus and a compartmentalized interior. How would you classify this cell?
A. as an advanced prokaryotic cell, because
it has a rigid cytoskeleton
B. as a primitive prokaryotic cell
C. as a possible transitional cell from
prokaryotic to eukaryotic
D. as a eukaryotic cell that has to be
heterotrophic
E. None of the answers options is correct.
C
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Analyses of sulfur isotopes have been used as evidence against life on the Moon, because the sulfides in lunar rocks have
A) an isotope composition similar to marine sulfate, which is enriched in 34S. B) an isotope composition similar to marine mud, which is depleted in 34S. C) an isotope composition similar to igneous rocks. D) exactly equal amounts of 34S and 32S.
You are at a stage in your research in which you must design an experiment to test your hypothesis
What factors must you include to insure that your experimental data is good valid data?
What will be an ideal response?Melatonin is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the pineal gland. e. the kidneys.
Human cells, with the exception of the gametes, reproduce by mitosis
Indicate whether the statement is true or false