Problems
Problem :
Identify the cell nucleus, mitochondria, and peroxisomes in the following
diagram.
Figure %: Eukaryotic cell
Figure %: Solution
Problem :
What is the name of the structures into which DNA is packaged inside the cell
nucleus?
DNA is packaged into chromosomes with proteins in the cell nucleus.
Problem :
Does the nucleus allow molecules to pass across its double membrane?
Yes. The nuclear membrane contains pores that allow only certain molecules to
pass across its membrane either in or out of the cell.
Problem :
Why does the mitochondria have two distinct sub-compartments?
Mitochondrial membranes have two layers—an inner and outer membrane. As a
result, there are two distinct spaces in the organelle. One between the inner
and outer membranes, called the intermembrane space, and one within the inner
membrane, called the matrix space.
Problem :
What is the chemical process that occurs in the peroxisomes?
Oxidation. The peroxisomes contain enzymes that oxidize intracellular molecules
like fatty acids.
Problem :
Identify the endoplasmic reticulum, golgi apparatus, and lysosome in the
following diagram.
Figure %: Eukaryotic cell
Figure %: Solution
Problem :
Why is it called "rough" endoplasmic reticulum?
It is called rough endoplasmic reticulum because it is coated with small
ribosomal particles that for a bumpy coat on the cytosolic side of the ER
membrane. It is contrasted with
smooth ER which lacks these ribosomes.
Problem :
How are proteins segregated in the golgi apparatus for secretion?
Most proteins contain a signal sequence at its end that tell the golgi to where
in the cell it should
be secreted.
Problem :
Into which face of the golgi apparatus do proteins from the ER enter? Which
face do they exit from?
Proteins enter the golgi apparatus through the cis face and exit through the
trans face.
Problem :
What is the function of the lysosome?
The lysosome functions to remove intracellular debris by digesting it with the
acidic enzymes found inside it.
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