The primary site of protein assembly within eukaryotic cells is the:
A) capsule.
B) cytoplasm.
C) cell wall.
D) ribosomes.
E) flagellum.
D) ribosomes.
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Which model organism best represents the human genome?
a. Caenorhabditis elegans b. Escherichia coli c. Homo sapiens d. Drosophila melanogaster
In the Gulf of Mexico dead zone, oxygen levels in lower water levels are low because ____.
a. phytoplankton consume vast quantities of oxygen without producing any oxygen b. the runoff into the dead zone is contaminated with high densities of bacteria that consume oxygen c. of the Great Lakes d. pollutants in runoff, especially fertilizers, lead to phytoplankton growth and the dead phytoplankton are consumed by bacteria that use up oxygen e. the runoff into the dead zone is already extremely low in oxygen and mixes with the water already present in the Gulf of Mexico
The biological species concept:
a. states that any organisms that are biologically similar constitute a species. b. states that a species is any group that shares similar DNA. c. is infrequently used because it is inapplicable to many organisms. d. defines a species as any group of actually or potentially interbreeding species that produce viable offspring. e. is the best and most accurate species concept.
In the section "Investigating Life: Solar-Powered Sea Slugs", the sea slug Elysia chlorotica absorbs chloroplasts as it digests algae. This allows the sea slug to live on sunlight and carbon dioxide and suggests that
A. photosynthesis can occur from proteins released from a digested chloroplast. B. regions of a plant outside of the chloroplast are necessary for photosynthesis. C. chloroplasts alone are sufficient for photosynthesis. D. some of the algae are not digested and are living symbiotically inside of the sea slugs. E. photosynthesis can occur outside of a chloroplast in algae.