What limits the resolving power of a light microscope?
The shortest wavelength of light used to illuminate the specimen.
When biologists wish to study the internal ultrastructure of cells, they most likely would use
A transmission electronic microscope.
The advantage of light microscopy over electron microscopy is that
light microscopy allows one to view dynamic processes in living cells.
A primary objective of cell fractionation is to
Separate the major organelles so their particular functions can be determined
In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is
the size and weight of the component
Which of the following correctly lists the order in which cellular components will be found in the pellet when homogenized cells are treated with increasingly rapid spins in a centrifuge.
nucleus, mitochondria, ribosomes
Quantum dots are small (15-30nm diameter), bright particles visible using light microscopy. If the dots can be specifically bound to individual proteins on a plasma membrane of a cell, which of the following correctly describes the advantage of using quantum dots in examining proteins?
The dots permit the motion of the proteins to be determined more precisely.
Which of the following are prokaryotic cells.
All of the following are part of a prokaryotic cell except
an endoplasmic reticulum
The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animal cells. The most reasonable explanation for this observation is that
Plant cells contain a large vacuole that reduces the volume of the cytoplasm.
Which of the following comparisons between prokaryotic and eukaryotic cells is incorrect?
The lack of organelles in prokayotes means that the basic cellular functions are different in prokaryotics than in eukaryotes.
Are a feature found in all cells
Found in plant cells only
Found in prokaryotic cells only
Which of the following does not contain functional ribosomes?
Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules?
Which of the following compounds require the presence of the nuclear pores to move between the cytoplasm and the interior of the nucleus?
A,B,C rRNA, ,mRNA, proteins synthesized in the cytoplasm that are part of ribosomes.
Which of the following organelles is not a common destination for small vesivles that bud off the Golgi apparatus?
Which of the following incorrectly matches the type of cell, type of protein, and site of the protein's synthesis?