Cells and organelles Exam Questions Flashcards
Normal size for a virus?
50nm
Normal size for a human cell?
30um
Smallest size resolvable by electron microscope
0.2nm
Smallest size resolvable by light microscope?
200nm
Normal size for bacterium?
1um
Rate of diffusion is not:
a. proportional to surface area.
b. proportional to distance
c. proportional to concentration difference
d. the main factor limiting the size of cells
e. significantly decreased above 50um
b. proportional to distance
Cells with dimensions larger than 50um…
are found in the nervous system
Cellular organelles:
a. are found in some prokaryotic cells
b. divide the cell into different functional compartments
c. are mostly surrounded by a double plasma membrane.
d. are found in the same proportions in all cells.
e. can exist independently of the cell
b. divide the cell into different functional compartments.
Perioxisomes are…
the site of phospholipid synthesis
The nucleolus is…
…the site of ribsome subunit assembly.
The golgi apparatus is…
…a structure with a cis and trans face, which creates lysosomes.
The nucleus is…
….bound by a double membrane interrupted by many pores.
Smooth endoplasmic reticulum is…
…the site of synthesis of lipids and steroids.
Mitochondria do not:
a. occur in greater numbers in cells with a high rate of oxidative respiration.
b. have a double plasma membrane.
c. contain their own DNA which encodes all their proteins.
d. have infoldings of membrane known as cristae.
e. compare in size to a prokayote.
c. Mitochondira do not contain their own DNA which encodes all their proteins.
Only SOME mitochondrial proteins are encoded by mitochondrial DNA.
What is the diameter of a cell nucleus?
3-10 um in diameter
