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Biophysics exam questions || A+ Guaranteed.
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  • Biophysics

Charaterize two general forms of the matter. correct answers Corpuscular structure: a chemical substance built up from atoms. Force fields: act between micro particle or between macroscopic bodies built up from these particles. Describe transformations between two general forms of the matter....

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  • December 15, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • charaterize two general forms of the matter

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  • Biophysics
  • Biophysics

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Biophysics exam questions || A+ Guaranteed.
Charaterize two general forms of the matter. correct answers Corpuscular structure: a chemical
substance built up from atoms.

Force fields: act between micro particle or between macroscopic bodies built up from these
particles.

Describe transformations between two general forms of the matter. correct answers Annihilation:
Positively charged particle (e.g. positron and proton) collides with a negatively charged particle
(electron and antiproton) into electromagnetic radiation (photon).

Pair formation: High energy electromagnetic radiation (e.g. gamma radiation) may produce
paricle - antiparticle pair.

What dagnotic method using in medicine is has based on the transformation one form of the
matter to another one. correct answers It is utilized in diagnostic imaging PET (positrion
emission tomography) and electron microscope.

List historical stages in development of structure analysis with approximate resolving powers of
listed methods. correct answers Human eye: ~ d 0,5-1 mm

Light microscope: d ~ 0,5 um

Electron microscope: d ~ 1 nm

X-ray diffraction d<1 nm atomic level

Define resolving power of microscopes. correct answers Resolving power of a microscope is the
ability to form distinguishable images of small objects separated by small distances.

What phenomenon was taken as the base for construction of electron microscope? correct
answers The electron microscope is based on the phenomenon that under certatin conditions
corpuscular particles display wave properties which are otherwise features of physical fields. It is
based on matter wave and its belonging to a particle.

Write approximate resolving power values of: electron microscope, human eye, light
microscope: correct answers Electron microscope: d ~1 nm

Human eye: d ~ 0,5 - 1 mm

Light microscope: d ~ 0,5 um

When a sample in microscope will be illuminating by light with shorter wavelength then
resolving power of microscope will be better or worse? correct answers Better

, Is it possible to see erhthrocytes (red cells in blood) and DNA molecule in light microscope?
correct answers Red blood cells, yes

DNA molecules, no
You can see the nucleus of the cell which contains DNA, but not the threads/strands.

When we want to see thickness of membrane bilayer, what instrument (light microscope or
human eye or X-ray crystallography or electron microscope) we need to use? correct answers
Electron microscope

Histology has formed after investigation light microscope or electron microscope? correct
answers Light microscope

Compare chemical bonds within a water molecule with the interactions aming water molecules
in liquid state. correct answers The atoms of a water molecules are bound together by polar
covalent bonds, which are very strong bonds. Water molecules in liquid state are bound togehter
by hydrogen bonds, which is a strong, weak bond.

List some physical properties of water and describe their importance for living organisms.
correct answers Density:

Melting point/boiling point:

Specific heat: Water has a spesific temperature, ensuring life for organisms. It also means that
our blood, which consist of a lot of water, is at a constant temperature giving us a stable body
temperature.

Surface tension: Formation of lipid and protein layers of cell membranes.

Solvent: Excellent solvent for many inorganic and organic compounds.

Water has fundamental importance in the development of life and its maintanance.

Explain phenomenon anomaly of water and write its importance in nature. correct answers
Nothing

What physical property of water is the most important for thermoregulation in organisms and
explain why. correct answers In terrestrial life, water is an important thermal regulator in two
ways. As a result of high water content in the tissues and high heat capacity of water, the heat
produced by metabolic processes would increase the temperature of the body only slowly even
without thermal regulation. However, due to the high evaporation heat of water, the superfluous
heat is easily lost.

What is the reason of water ordered structure, which exists in biological systems like the cells?
correct answers Bound water is of importance to get and obtain ordered structure in biological

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