Question 1

Which of the following is NOT commonly found in association with the cell membrane?
A) Glycolipids
B) Integral proteins
C) Peripheral proteins
D) Cytochrome
E) Cholesterol

Accepted Answer

Cytochrome is not commonly found in association with the cell membrane; it is primarily involved in the electron transport chain within mitochondria, not in the structure or function of the cell membrane.

Question 2

In general, how much of cellular membrane mass is comprised of proteins?
A) 20%
B) 30%
C) 60%
D) 40%
E) 50%

Accepted Answer

Cellular membranes typically have about 50% of their mass comprised of proteins, which play crucial roles in various functions such as transport, signaling, and structural support.

Question 3

Two models currently exist as to the mechanism behind how glycoproteins and polysaccharides are processed and packaged in the Golgi apparatus. Which of the following statements is true in relation to at least one of these models?
A) Cargo molecules, having entered the cis-most cisterna, then progress through consecutive cisterna. In each cisterna the molecules are processed by enzymes specific to that cisterna. The number of cisternae the molecule is transported through is therefore directly proportional to the degree of modification it undergoes.
B) Cargo molecules move from one cisterna to the next in an anterograde direction via small vesicles. The processing enzymes that modify the cargo molecules remain in the same cisterna within the stack.
C) Processing enzymes move in a retrograde direction into only the first cisterna, with all subsequent movement external to cisternae and instead occuring via vesicles where processing enzymes are active.
D) Processing enzymes move freely between cisternae and vesicles where they come in to contact with cargo molecules moving from one cisternae to the next.
E) Vesicles and cisternae constantly fuse and divide, by which means they facilitate processing enzymes to contact and interact with cargo molecules as they move in either an anterograde or retrograde direction.

Accepted Answer

The answer of Two models currently exist as to the...

Question 4

Why is the Golgi apparatus, unlike other cellular features, always spelt with a capital letter?
A) It is a cellular feature of particularly crucial importance, signified by its beginning with a capital letter.
B) When first described by Alberto Minguell in 1886, it was accidentally spelt with a capital letter which has carried on into modern literature.
C) It is named after Camillo Golgi, who first identified the Golgi apparatus in 1897.
D) It is an acronym for 'Glucose orthophosphate layers, glyco-transport intracellular'.
E) Golgi is an abbreviation for Golgihexoheptahydratekinase. Scientific terms commonly spelt as an abbreviation have a capital letter to identify it as such.

Accepted Answer

The Golgi apparatus is named after Camillo Golgi, an Italian scientist who first identified it in 1897, hence the capitalization as it is a proper noun.

Question 5

Which of the following is NOT a cargo molecule transported via the Golgi apparatus?
A) Polysaccharides
B) Transcripts
C) Proteins
D) Glycoproteins
E) All options listed here are correct.

Accepted Answer

Transcripts refer to RNA molecules, which are not transported via the Golgi apparatus. The Golgi apparatus is involved in the modification, sorting, and packaging of proteins and lipids for secretion or use within the cell, not RNA transcripts.

Quiz 4: Functioning Cells

Which of the following is NOT commonly found in association with the cell membrane?

In general, how much of cellular membrane mass is comprised of proteins?

Two models currently exist as to the mechanism behind how glycoproteins and polysaccharides are processed and packaged in the Golgi apparatus. Which of the following statements is true in relation to at least one of these models?

Why is the Golgi apparatus, unlike other cellular features, always spelt with a capital letter?

Which of the following is NOT a cargo molecule transported via the Golgi apparatus?