Tonicity, Microscopes, SA:V

Question 1

What does it mean when a cell is hypertonic

Answer 1

The cell has a higher amount of solute as compared to the surrounding environment. Typically shrivel as water is leaving the cell to be isotonic.

Question 2

A physical description of hypotonic cells would be

Answer 2

Bloated with a lower amount of solute causing water to enter the cell.

Question 3

What is the difference between light and electron microscopes

Answer 3

Electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard light microscopes.

Question 4

Explain why you would use a transmission electron microscope to view organelles rather than a scanning electron microscope

Answer 4

TEM magnifies to an extreme degree whilst producing the highest possible resolution. The black and white image is unnoticable fir this examination.

Question 5

Identify organelles that can only be seen with electron microscope (dunno if this will be on test)

Answer 5

Mitochondria, Rough and Smooth Endoplasmic Reticulum, Ribosomes, Golgi Apparatus and vesicles

Question 6

identify cell components that can be seen with current light microscope (dunno if on test)

Answer 6

nucleus, cytoplasm, cell membrane, chloroplasts and cell wall

Question 7

If the length of a cube is 3cm. What is the SA:V ratio?

Answer 7

Sa:6x3^2=54
V:3^3=27
54:27=2:1

Question 8

Whole cube is 10cm^3 in volume while the coloured cube is 4cm^3

Answer 8

10-4=6 (Y-X)
6/10=0.6
0.6x100=60% ((Y-X)/Y x100)