Btec Applied Science Unit 1 Biology
Questions And Answers With Verified
Solutions Already Passed!!!
Eukaryotic cell - ANSWER✔✔Complex cells with a nucleus and membrane bound
organelles
Prokaryotic cell - ANSWER✔✔Simple cells that don't have a nucleus or
membrane bound organelles
Cell theory - ANSWER✔✔1665, Robert Hooke first described cells. 1674-1683,
first living cell was observed and the universal cell theory by Schwann. 1831,
nucleus observed by Brown. 1852, evidence for origin of new cells by Remak. In
1860, spontaneous generation disproved by Pasteur
Light microscopy - ANSWER✔✔Uses visible light and magnifying lense to
observe sub-cellular structures.
Electron microscopy - ANSWER✔✔Uses a beam of electrons in a vacuum with a
wavelength of wavelength of less than 1nm.
What is an advantage of using a light microscope? - ANSWER✔✔Can observe
sub-cellular structures
What is a disadvantage of using a light microscope? - ANSWER✔✔Low
magnification (x500) and a low resolution (x200nm)
, What is an advantage of using an electron microscope? - ANSWER✔✔High
magnification (x500,000) and high resolution (x0.1nm)
What is a disadvantage of using an electron microscope? - ANSWER✔✔Can
damage the sample
What is the equation for magnification? - ANSWER✔✔Magnification = image
size / actual size
Nucleus - ANSWER✔✔Contains DNA and is the control centre of the cell
Ribosome - ANSWER✔✔Site of proteinsynthesis where amino acids are present
to make the proteins.
Endoplasmic recticulum - ANSWER✔✔Makes lipids and packages proteins for
the golgi apparatus
Mitochondria - ANSWER✔✔Breaks food molecules down to make ATP
Chloroplasts - ANSWER✔✔The sight of photosynthesis where light is trapped in
chlorophyl
Golgi apparatus - ANSWER✔✔Modifies proteins for them to be transported in
vesicles around the cell.
Vacuole - ANSWER✔✔Stores water and other materials to keep the cell turgid
and maintain a rigid framework
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