#Question id: 12137
#Unit 10. Ecological Principles
#Question id: 6974
#Unit 5. Developmental Biology
Where are the stem cells that renew the epithelium of the gut found?
#Question id: 10920
#Unit 6. System Physiology – Plant
The pressure-flow model, first proposed by Ernst Münch, Phloem loading at the source and phloem unloading at the sink establish the pressure gradient.
a.) In source tissues, an accumulation of sugars in the sieve elements generates a lower or negative solute potential (ψs).
b.) source tissue, causes a steep drop in the water potential (ψ), due to water potential gradient, water enters the sieve elements and causes turgor pressure (ψp ) decrease.
c.) In sink tissues, phloem unloading leads to a lower sugar concentration in the sieve elements, generating a higher or less negative solute potential.
d.) As the water potential of the phloem rises above that of the xylem, water tends to leave the phloem in response to the water potential gradient, causing a decrease in turgor pressure in the sieve elements of the sink.
Which of the following statements of sink and source tissue is FALSE?
#Question id: 10252
#Unit 6. System Physiology – Plant
When molecular oxygen is unavailable—for example, in plant roots in flooded soils—glycolysis can be the main source of energy for cells, How?
#Question id: 11618
#Unit 8. Inheritance Biology
A monohybrid cross between two heterozygous yellow mice forms the progeny in F1 generation is yellow and non-yellow with the genotype YY(Lethal) and yy , so what will be the ratio of this cross?