In yeast, posttranslational translocation of proteins targeting the ER is
a. a process affecting many newly synthesized proteins.
b. much less common than in mammalian cells.
c. rare.
d. impossible, because all translocation into the ER is driven by the process of protein synthesis.
Ans: a. a process affecting many newly synthesized proteins.
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In normal cells, cell adhesion molecules are partially responsible for the cell's ability to ____
a. migrate to new locations in the body b. recognize other cells as "self" c. exocytosis d. both migrate to new locations in the body and recognize other cells as “self” e. recognize linkages between cells in muscle and bone
Most biologists agree that the most recent common ancestor of all animals was probably a ____, an
idea first proposed by Ernst Haeckel in 1874.
a. jellyfish b. ciliated protozoan c. sessile sponge d. chytrid e. colonial, flagellated protist
You are conducting a long term study of ecosystem functioning in a freshwater lake. You and your field assistants gather data for many biotic and abiotic factors, including species diversity, water and benthic quality, and turbidity. Over the ten years of your study, you find that the abundance of water lilies is correlated with several other factors. When water toxicity and turbidity are high and water pH is abnormally low, water lilies quickly become scarce, followed by periods where fish, amphibians, and water birds are also scarce or absent. In years water nutrient levels are very high, water lilies quickly become abundant, followed by years where wading birds are scarce. From these data, you conclude that water lilies are
A. an indicator species. B. an endemic species. C. an umbrella species. D. a keystone species. E. a flagship species.
Flagellated cells can
A) attach to surfaces more effectively because of the flagella. B) move the cell through fluid. C) move internal organelles more efficiently than nonflagellated cells. D) divide more quickly than nonflagellated cells.