Top answers

Explain how the resting potential of -70mV is maintained in a sensory neuron.

The resting potential is a result of the concentrations of the sodium and potassium ions inside the neuron compared to outside. The leaky channels in the sensory neuron membrane allow the movement of Na+ (so...
JM
Answered by Jessica M. • Biology tutor
19845 Views

Why does the mass of a potato chip decrease after it is left in a concentrated sugar solution?

The water potential of the concentrated sugar solution is much lower than the water potential inside the cells of the potato chip. Therefore, the water molecules move down a concentration gradient out of the...
TM
Answered by Tasneem M. • Biology tutor
17547 Views

What are three adaptations in a leaf for photosynthesis?

Thin waxy cuticle - to protect the leaf without blocking the lightThin transparent epidermis - to allow more light to reach the palisade cellsLayers of palisade cells on the top surface - to absorb light
Answered by • Biology tutor
6821 Views

Explain how the properties of water are significant to living organisms.

Water is the medium of life. Its four key properties - thermal properties, ability to act as a universal solvent, cohesion and adhesion - help support the life processes and habitats of virtually all organis...
Answered by • Biology tutor
119611 Views

Describe the requirements, process and applications for Polymerase Chain Reaction (PCR)

Requirements· Original DNA sample (to be amplified)· dNTPS (4 DNA nucleotide bases)· Thermal cycler (reaction vessel)· Buffer solution (to maintain stable pH)· Taq Polymerase· DNA primers (forward and revers...
VL
Answered by Verity L. • Biology tutor
1768 Views