In the context of a scientific experiment, what is a control group?
a group that is treated differently from others except for the variable being tested
a group that is treated the same as other groups except for the variable being tested
a group assembled only under environmentally controlled conditions
a group treated the same as others
except that it has fewer subjects
a group that is treated the same as other groups except for the variable being tested
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Ignicoccus has several unique structural features that have lead scientists to propose that it may be the modern descendent of the ancestral cell type that gave rise to the origin of eukaryotic cells
What are the unique features of Ignicoccus and why do they support this hypothesis? What will be an ideal response?
Shitake mushrooms are decomposers that break down biological molecules from dead organisms
These organisms belong to the ____ kingdom.
a. Plantae b. Fungi c. Animalia d. “Protist” e. Bacteria
What might be the advantage to an ancestral cell if it maintained a photosynthetic bacterium within its cytoplasm rather than digest it?
A. It could now live in a highly oxygenated environment. B. It could now utilize hydrogen sulfide as an energy source. C. It could now use glucose as an energy source. D. It could now use photosynthesis to make its food.
Name the indicated structure in this image of a sperm
1.acrosome
2.flagellum
3.mitochondria
4.nucleus