In very dry soils, the water potential (Yw) may fall below what is called the permanent wilting point, the water potential of the soil is so low that plants cannot regain turgor pressure even if all water loss through transpiration ceases. This means that

a) The hydraulic conductivity decreases drastically 

b) The water potential of the soil (Yw) is less than or equal to the osmotic potential (Ys ) of the plant

c) The water potential of the soil (Yw) is more than the osmotic potential (Ys) of the plant

d) cell osmotic potential (Ys) varies with plant species, the permanent wilting point is clearly not a unique property of the soil, it depends on the plant species

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#Question id: 2018

#Unit 4. Cell Communication and Cell Signaling

What aspect of the immune response would a patient who has a parasitic worm infection and another patient responding to an allergen such as ragweed pollen have in common?

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#Question id: 2093

#Unit 2. Cellular Organization

Which of the following is transmembrane proteins?

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#Question id: 1159

#Unit 4. Cell Communication and Cell Signaling

Cholera toxin can make you sick through overactivation of a Gs pathway even if your body stops making the ligand associated with activation of the pathway. Knowing this, which of the following CANNOT be true about cholera toxin?

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#Question id: 18832

#Unit 13. Methods in Biology

The following PCR technique allows measuring the DNA amplification at each cycle of PCR contrary to end point detection in traditional PCR

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#Question id: 33516

#Unit 2. Cellular Organization

human mitochondrial DNA is descended from a