Gastrulation in sea urchins, Drosophila, and Xenopus all begin with a change in cell shape, in which the apical surface of an epithelial sheet contracts. This process is called:

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#Question id: 2086

#Unit 2. Cellular Organization

Which of the following is (are) not present in biomembranes?

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#Question id: 11385

#Unit 10. Ecological Principles

Which of the following biomes is correctly paired with the description of its climate?

A) savanna-low temperature, precipitation uniform during the year

B) tundra-long summers, mild winters

C) Taiga-relatively short growing season, Low precipitation

D) temperate grasslands-relatively warm winters, most rainfall in summer

E) tropical forests-nearly constant day length and temperature

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#Question id: 15779

#Unit 5. Developmental Biology

During stem cell regulation extracellular mechanisms leading to intracellular changes that regulate stem cell behaviour. Which of the following is not consider as extracellular mechanisms for stem cell regulation?

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#Question id: 585

#Unit 1. Molecules and their Interaction Relevant to Biology

In an enzyme reaction involving one enzyme and one substrate, the rate of the reaction depends on

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#Question id: 15595

#Unit 8. Inheritance Biology

How might the function of extracellular endonucleases help protect the bacterium from infection by viruses?