In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously. Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signalling?

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#Question id: 18373

#Unit 12. Applied Biology

Scientists engineered a bacterial strain of P. fluorescens which is able to degrade 2,4-dinitrotoluene. This bacteria also helps in 

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#Question id: 1241

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a common step in the opening/closing of ion channels by acetylcholine and rhodopsin binding to their receptors?

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#Question id: 2246

#Unit 2. Cellular Organization

Which of the following statements describe(s) the typical biomembrane?

a. It may include different types of lipid molecules.

b. The lipid molecules in the membrane are attached to each other though covalent bonds.

c. All lipids and proteins in the biomembrane are equally mobile.

d. It contains a hydrophilic core.

e. It has a cytosolic face and an exoplasmic face.

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#Question id: 13178

#Unit 10. Ecological Principles

Turnover of water in temperate lakes during the spring and fall is made possible by which of the following? 

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#Question id: 16322

#Unit 7. System Physiology – Animal

Immediately after putting on a shirt, your skin might feel itchy. However, this perception soon fades due to ________.