Question 1

In animal cells the main microtubule organizing center (or centrosome) is important in cell division. 
__________________

Accepted Answer

The centrosome contains a pair of centrioles and is important in organizing the microtubules during cell division, specifically in the formation of the spindle fibers that separate the chromosomes during mitosis.

Question 2

Enzymes called proteases in the ER lumen catalyze folding of proteins into proper conformations. 
__________________

Accepted Answer

Enzymes called chaperones, not proteases, catalyze folding of proteins into proper conformations in the ER lumen. Proteases cleave proteins into smaller peptides or amino acids.

Question 3

Match between columns
                        Premises: large membranous sacs of plants and fungi
encloses an internal thylakoid membrane
consists of RNA and protein within another organelle
rodlike structures consisting of actin
membranous sacs in animals
ribosomes stud its outer surface

Accepted Answer

The Answer of plastids and nucleolus and microfilaments and vacuoles is...

Question 4

Some cells are very large, seemingly in defiance of maintaining a large surface area to volume ratio. What are some strategies or adaptations that these cells may use in order to maintain a reasonable surface area to volume ratio?

Accepted Answer

The answer of Some cells are very large, seemingly in...

Question 5

Golgi complexes of prokaryotic cells produce extracellullar polysaccharides that are used to make cell walls. 
__________________

Accepted Answer

Prokaryotic cells do not have Golgi complexes; they lack membrane-bound organelles. Cell wall components in prokaryotes are synthesized in the cytoplasm and at the cell membrane.

Question 6

Mitochondria play an important role in cell necrosis . __________________

Accepted Answer

The answer of Mitochondria play an important role in cell...

Question 7

For the following medical conditions, describe the likely cellular organelle or structure that has been affected in such a way as to cause the condition (note: There may be more than one organelle or structure involved): 
A. The sperm of a man cannot swim, thus rendering him infertile. 
B. A child experiences kidney failure due to Fabry's disease where the cells lining the inside of the kidney tubule accumulate abnormally large amounts of glycolipids that are usually degraded by enzymes. 
C. A person dies within minutes after ingesting cyanide because ATP is no longer being synthesized.

Accepted Answer

The answer of For the following medical conditions, describe the...

Question 8

A bacterial pathogen has just entered the body of a person. Describe the sequence of events that lead to the production of enzymes that will hydrolytically destroy the bacterial cell, beginning with events in the nucleus and ending with destruction of the pathogen.

Accepted Answer

The answer of A bacterial pathogen has just entered the...

Question 9

Peroxisomes are found in large numbers in cells that synthesize, store, and degrade lipids, and one of their functions is to break down protein molecules. 
__________________

Accepted Answer

Peroxisomes are primarily involved in lipid metabolism and the breakdown of hydrogen peroxide, not protein degradation. Protein breakdown occurs primarily in lysosomes.

Question 10

Proteasomes direct the destruction of defective DNA . __________________

Accepted Answer

Proteasomes are involved in degrading proteins, not DNA. They break down damaged or unneeded proteins tagged with ubiquitin, while DNA repair and destruction are managed by other cellular mechanisms.

Question 11

Cells that secrete large amounts of glycoprotein have many Golgi stacks. 
__________________

Accepted Answer

Golgi stacks play a crucial role in glycoprotein synthesis and secretion. Cells that produce and secrete large amounts of glycoprotein require many Golgi stacks to facilitate the modification, sorting, packaging, and secretion of these proteins. The Golgi stacks in these cells are highly developed and tend to be larger and more numerous than in cells that produce fewer glycoproteins. Therefore, the statement is true.

Quiz 4: Organization of the Cell

In animal cells the main microtubule organizing center (or centrosome) is important in cell division. __________________

Enzymes called proteases in the ER lumen catalyze folding of proteins into proper conformations. __________________

Match the organelle to the description of its structural components.

Some cells are very large, seemingly in defiance of maintaining a large surface area to volume ratio. What are some strategies or adaptations that these cells may use in order to maintain a reasonable surface area to volume ratio?

Golgi complexes of prokaryotic cells produce extracellullar polysaccharides that are used to make cell walls. __________________

Mitochondria play an important role in cell necrosis . __________________

A bacterial pathogen has just entered the body of a person. Describe the sequence of events that lead to the production of enzymes that will hydrolytically destroy the bacterial cell, beginning with events in the nucleus and ending with destruction of the pathogen.

Peroxisomes are found in large numbers in cells that synthesize, store, and degrade lipids, and one of their functions is to break down protein molecules. __________________

Proteasomes direct the destruction of defective DNA . __________________

Cells that secrete large amounts of glycoprotein have many Golgi stacks. __________________