Q: Which equation best represents the conversion of chemical energy to mechanical energy by kinesin during vesicle transport?

$ \text{ATP} \rightarrow \text{ADP} + \text{P}_i + \text{mechanical work} $

Question 1

Which of the following best explains why mitochondria are considered semi-autonomous organelles in eukaryotic cells?

Accepted Answer

They have their own DNA and ribosomes, allowing them to grow and divide independently of the cell cycle.

Question 2

A researcher uses differential centrifugation to isolate cell components. Which organelle would be most enriched in a fraction containing high levels of ATP production enzymes?

Accepted Answer

Mitochondria

Question 3

Which structural feature of the inner mitochondrial membrane is essential for maximizing ATP production?

Accepted Answer

Folding into cristae to increase surface area

Question 4

According to the endosymbiosis theory, which evidence supports the idea that mitochondria and chloroplasts originated from free-living bacteria?

Accepted Answer

Both contain their own circular DNA and ribosomes similar to those found in bacteria.

Question 5

A mutation disrupts the ER signal sequence in a protein destined for the lysosome. What is the most likely consequence?

Accepted Answer

The protein will remain in the cytosol and not reach the lysosome.

Question 6

Which process describes the addition of carbohydrate groups to proteins in the ER, resulting in glycoprotein formation?

Accepted Answer

Glycosylation

Question 7

During the pulse-chase experiment, what did the movement of labeled proteins from the rough ER to the Golgi apparatus demonstrate?

Accepted Answer

Proteins follow a secretory pathway from the rough ER to the Golgi before secretion or delivery to other organelles.

Question 8

Which cytoskeletal element is primarily responsible for maintaining the shape of the nucleus and anchoring chromosomes?

Accepted Answer

Intermediate filaments (lamins)

Question 9

A vesicle containing newly synthesized proteins must travel from the ER to the Golgi apparatus. Which cytoskeletal structure and motor protein are involved in this transport?

Accepted Answer

Microtubules and kinesin

Question 10

Which of the following best describes the function of the nuclear pore complex?

Accepted Answer

It selectively regulates the passage of molecules between the nucleus and cytosol.

Question 11

A cell is observed to have a large number of grana and thylakoids. What is the primary function of this cell?

Accepted Answer

Photosynthesis

Question 12

Which equation best represents the conversion of chemical energy to mechanical energy by kinesin during vesicle transport?

Accepted Answer

$ 	ext{ATP} ightarrow 	ext{ADP} + 	ext{P}_i + 	ext{mechanical work} $

Question 13

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Catalyzing chemical reactions

Question 14

Which cellular structure is responsible for the synthesis and initial folding of secretory proteins?

Accepted Answer

Rough ER

Question 15

A mutation prevents the addition of mannose-6-phosphate to a lysosomal enzyme. What is the most likely outcome?

Accepted Answer

The enzyme will be secreted from the cell instead of delivered to the lysosome.

Question 16

Which cytoskeletal element is most abundant in animal cells and is involved in cell movement and shape changes?

Accepted Answer

Actin filaments (microfilaments)

Question 17

Which of the following best describes the difference between prokaryotic and eukaryotic flagella?

Accepted Answer

Eukaryotic flagella move by whipping back and forth, while prokaryotic flagella rotate like a propeller.

Question 18

Which of the following statements about the cell wall in plants and algae is correct?

Accepted Answer

It provides a durable outer layer and structural support to the cell.

Question 19

Which process allows large molecules to be digested and recycled by lysosomes before their monomers are used by the cell?

Accepted Answer

Endocytosis followed by lysosomal degradation

Question 20

A cardiac muscle cell is observed to have a high density of mitochondria. What does this suggest about its specialized function?

Accepted Answer

It requires large amounts of ATP for contraction.

Inside the Eukaryotic Cell: Structure and Function of Cell Components

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