4.7-4.12

Question 1

_______ are a distinguishing characteristic of eukaryotic cells

Answer 1

Membranes

Question 2

Which of the following cellular components is not part of the endomembrane system

Answer 2

Peroxides and Mitchochondria

Question 3

Smooth ER (SER) lacks _______, which gives it a “smooth” appearance

Answer 3

Ribosomes

Question 4

Which type of of ER would you expect the cells of the pancreas to find in great abundance? Explain your answer.

Answer 4

Y ou would expect the cells of the pancreas to have a large amount of rough endoplasmic reticulum
because it would be making a large amount of proteins for excretion.

Question 5

What other organelle of the endombrane system would you expect to find in great abundance.

Answer 5

Y ou would also expect the pancreas to have an extensive network of Golgi, which would be necessary
to ship the enzymes out of the cells of the pancreas.

Question 6

True or false: A protein that is destined to be inserted into the plasma membrane as opposed to being
secreted still travels through the Golgi stacks. If false, make it a correct statement. (

Answer 6

True

Question 7

Place the following steps in the order in which they occur:
a. Proteins are modified as they pass through the Golgi apparatus.
b. A vesicle from the rough ER fuses with the Golgi membrane.
c. A vesicle buds off from a Golgi stack.
d. A vesicle containing a secretory protein fuses with the cell’s plasma membrane.

Answer 7

b, a, c, d

Question 8

Lysosomes

Answer 8

An organelle that
compartmentalizes
destructive
enzymes and an
acidic
environment for the
breakdown of cellular
components

Question 9

V acuoles

Answer 9

A large
structure
usually used for
storage of
different
substances that
range from toxins
to pigments

Question 10

Vesicles

Answer 10

A small membranous sac that is used for transport

Question 11

____________
are organelles involved in the metabolism of fatty acids and peroxide.

Answer 11

Peroxisomes

Question 12

Internal compartmentalization is crucial to the proper function of a cell. List two organelles where
this is important and briefly explain why you chose them.

Answer 12

Lysosomes because they compartmentalize destructive enzymes; peroxisomes because they make
hydrogen peroxide (a toxic substance) as a by-product of their metabolism