Order the following statements to correctly describe the route of secreted protein as it is synthesized and secreted from a eukaryotic cell.1. Translation begins on a ribosome.2. The ribosome attaches to the rough endoplasmic reticulum and the newly formed polypeptide is pushed into the lumen of the rough ER.3. The protein folds and undergoes modification within the rough ER.4. The protein travels within a membranous vesicle from the ER to the cis face of the Golgi apparatus.5. The protein travels toward the trans face of the Golgi, from which it is packaged into a secretory vesicle.6. The secretory vesicle travels to and merges with the cell membrane, releasing its contents outside of the cell.
Fill in the blank(s) with the appropriate word(s).
2, 4, 1, 6, 5, 3
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What statement is in accordance with the keystone hypothesis?
A. Each species plays a small, but important role in the health of an ecosystem. B. The fewer species present in an ecosystem, the more stable the community. C. Only a few species contribute to the functioning of a particular ecosystem. D. The role of each species within an ecosystem is highly unpredictable.
Using a plant for food would be an example of an ecosystem
a. good. b. process. c. service. d. all of these
Microspores mature into
a. ovules. b. seeds. c. pollen grains. d. megaspores. e. pollen sacs
An _______ is a general term for a substance that stimulates an immune response.
A. IgE B. antigen C. histamine D. interferon