Biophysics 2

Indicate in which case the energy of hydrogen bond is strongest 

If the wavelength is increased by 100% and the velocity of the wave propagation is unchanged then:

The phenotypical properties of the medium changed and the density increased twice (by 100%) and the sound velocity (c) increased three (four times). Indicate how much the acoustic impedance has changed

The sound wave travels within the medium MI and enters the medium M2 crossing the interface between these two media. The acoustic impedances for M1 and M2 are 3kgm^2s and 1kgM^2s respectively. Indicate the value of reflection coefficient.

Indicate the phenomena that do not contribute to electrodiffusion:

Sound velocity:

Ultrasound beam is propagated through a soft tissue and enters one indicated below. Indicate when the reflection will be minimal: 

Which phenomenon required the highest energy of photon:

The ultraviolet radiation is:

The sound waves:

A particle consisting of two protons and two neutrons are called:

Indicate the consequence of decrease in the value of the partition coefficient B (membrane-liquid partitioning) for the substancetransported through the membrane. Assume that the concentration of the transported substance on both sides of the membrane remain unequal and do not change the experimental observation.

The cell membrane (non-excitable cell) is stimulated with the current I. Assuming that the Cm is the membrane capacitance and Rm is the input resistance indicate the maximum change in the membrane voltage evoked by this stimulus.

When the input resistance of an excitable cell is increasing 

Choose the correct statement for the neuromuscular junction:

If the intracellular concentration of cation is smaller than the extracellular one, the Nerst equilibrium potential for this ion is:

During a prolonged depolarization of the cellular membrane the bulk electrolyte in the  cytoplasm 

At the resting membrane potential of a typical neuronal cell, the value of electrical driving forces for potassium and sodium ions are approximately 

We consider an artificial lipid bilayer to which some non-selective channels were incorporated. The resting potential of this membrane will take the value 

Indicate correct concept of the voltage-champ technique 

Indicate in which case action potential is not propagated with a constant amplitude 

GABA receptors are 

If the cellular membrane becomes permeable solely to potassium ions then the membrane potential of such cell would become close to (assume the physological intra and extracellular concentration of ions):

If the input resistance of a cell membrane is 10MOhms (mehaOhms) and its capacitance is 500 pF (picoFarads), the time constant of the membrane is: 

Figure below presents a dipole. The value of the electrical potential at the distance R on the solid line is V*. What would be the value of the potential when increasing the disatnce three times (3R) on the same direction defined by the solid line in the figure? 

If the input resistance of a cell membrane is 10 MOhms (mgea Ohms) and its capacitance is 100 pF (Pico Farads), the time constant of the membrane is:

If the input resistance of a cell mebrane is 10 MOhms (megaOhms) and ist capacitance is 500 pF, the time constant of the membrane is: 

The ultraviolet radiation is:

The infrared light is :

Sound velocity: 

Sound velocity:

In which conditions a proton in the presence of external magnetic field (B) is in the state characterized by the highest energy.    (µ is the magnetic moment of the proton)

In which conditions a proton in the presence of external magnetic field (B 0) is in the charcterized by the lowest energy.

What happens to the mebrane capacitance of a cell if both its surface area and thickness nicrease two fold (two times)?

What happens to the membrane capacitance if its thickness two folds (two times) 

If the intracellular concentration of the cation is smaller than the extracellular one, the Nerst equilibrium potential for this ion is:

If the intracellular concentration of cation is larger tahn the extracellular one, the Nernst equilibrium potential for this ion is: 

The physical properties of the medium changed and the density increased twice (by 100%) and the sound velocity (c) increased three (four times). Indicate how much the acoustic impedance has changed 

The physical properties of the medium changed and the density (p) increased twice and sound velocity (c) increased fourfold. Indicate how much the acoustic ompedance has changed.

The ultrasound emits a pulse of ultrasound wave into the examined soft tissue at time t=0. The echo is detacted at 0,1ms. Assuming the sound velocity in the soft tissue 1500 m/s indicate the distance between the ultrasonograph´s head and the tissue from which sound was reflected.