Which two organelles are responsible for producing phospholipids and sphingolipids?

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#Question id: 31297

#Unit 5. Developmental Biology

BMP inhibitors secreted by the organizer at the dorsal side of the embryo, these organizer proteins are named as:

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#Question id: 1755

#Unit 4. Cell Communication and Cell Signaling

Prior to class switching, B-cells express:

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#Question id: 23701

#Unit 13. Methods in Biology

To introduce a particular piece of DNA into an animal cell, such as that of a mouse, you would find more probable success with which of the following methods?

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#Question id: 33394

#Unit 1. Molecules and their Interaction Relevant to Biology

For Helix-turn-Helix, which of the following is correct

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#Question id: 26982

#Unit 10. Ecological Principles

Which of the following statements about the evolution of life histories is correct?

a.Unstable environments with unlimited resources favor r-selected populations.

b.K-selected populations are most often found in environments where density-independent factors are important regulators of population size.

c.Most populations have both r- and K-selected characteristics that vary under different environmental conditions.

d.The reproductive efforts of r-selected populations are directed at producing just a few offspring with good competitive abilities.