Question 1

Which of the following works like a propeller?

Accepted Answer

Prokaryotic flagella work like a propeller, rotating to move the cell, unlike eukaryotic flagella and cilia, which use a whip-like motion.

Question 2

The following figure shows a mitochondrion,emphasizing its inner and outer membranes.  The inner membrane of the mitochondria is thought to have evolved from

Accepted Answer

The inner membrane of the mitochondria has a similar structure to the plasma membrane of prokaryotic cells, and is thought to have evolved from the plasma membrane of a prokaryotic cell engulfed by an early eukaryotic cell. This theory is known as the endosymbiotic theory of mitochondria.

Question 3

Which of the following would you find in the cells that produce the mucus that lines the nasal cavities?

Accepted Answer

Vesicles are membrane-bound organelles that are involved in the secretion of substances such as mucus. The cells that produce mucus in the nasal cavities contain vesicles that release the mucus into the lumen of the nasal cavity. Grana, thylakoids, and flagella are not typically found in these cells.

Question 4

The ________ model describes the plasma membrane as a mobile mixture of phospholipids and proteins.

Accepted Answer

The answer of The ________ model describes the plasma membrane...

Question 5

At the most basic level of life,organic compounds are organized into energy-dependent,self-replicating units known as ________.

Accepted Answer

The answer of At the most basic level of life,organic...

Question 6

Which of the following is correctly matched?

Accepted Answer

Flagella are composed of microtubules made of tubulin, while cilia are also composed of microtubules but are shorter and more numerous than flagella. Pseudopodia are temporary extensions of cells and are primarily composed of actin filaments, which are a type of microfilament. Keratin is a type of intermediate filament that provides structural support to cells in epithelial tissues.

Question 7

The light-capturing pigments of photosynthesis like chlorophyll are contained in the membrane of a structure known as a(n)

Accepted Answer

The light-capturing pigments of photosynthesis like chlorophyll are contained in the membrane of a structure known as thylakoids. Thylakoids are flattened, membrane-bound sacs inside chloroplasts where the light-dependent reactions of photosynthesis occur. The pigments, including chlorophyll, are embedded in the thylakoid membrane and capture light energy to drive the process of photosynthesis.

Question 8

The entire contents of a cell,except for the nucleus,are included in the ________.

Accepted Answer

The answer of The entire contents of a cell,except for...

Question 9

Which of the following statements is FALSE?

Accepted Answer

Microtubules, not actin filaments, define the paths for vesicle movement within the cell.

Question 10

Which of the following statements about mitochondria and chloroplasts is FALSE?

Accepted Answer

The answer of Which of the following statements about mitochondria...

Question 11

Protists use cilia to move within their habitat,but ciliated human cells like those in the bronchi are always anchored to one another and to an extracellular matrix; what benefit does cilia provide these cells?

Accepted Answer

Ciliary movement can create currents that move secretions like mucus over the surface of a tissue. In the bronchi, ciliated cells work together to move mucus and other secretions out of the airways to prevent buildup and potential infection. The cilia beat in a coordinated motion to create a current that moves the mucus towards the throat where it can be swallowed or coughed out.

Question 12

Which of the following diseases is NOT caused by a malfunction of or problem in the lysosomes?

Accepted Answer

The answer of Which of the following diseases is NOT...

Question 13

You are an astronaut and have discovered an alien photosynthetic organism.It has organelles that are responsible for photosynthesis; these organelles appear to work in much the same way as the chloroplasts in plants on Earth.The only difference is that they are red.Which color of light is NOT likely to drive photosynthesis in these alien organelles?

Accepted Answer

Red organelles likely reflect red light, making it less effective for photosynthesis, similar to how green chloroplasts reflect green light.

Question 14

Microtubules are responsible for

Accepted Answer

Microtubules are structural components of the cytoskeleton and provide the framework for the cell's shape. They are also involved in intracellular transport and the movement and positioning of organelles within the cell. Pseudopodia are formed by actin filaments, not microtubules. Microfilaments or intermediate filaments, not microtubules, are responsible for reinforcing and supporting cell structure. Microtubules, again, are not involved in strengthening skin cells.

Question 15

DNA from which listed organelle is inherited from a child's mother?

Accepted Answer

Mitochondria have their own DNA, which is passed down from the mother during fertilization. The nucleus contains the majority of a person's DNA, but it is inherited from both parents. Chloroplasts are only found in plant cells, and lysosomes do not have their own DNA.

Question 16

Certain ________ in a cell's membrane form channels through which ions and molecules may pass.

Accepted Answer

The answer of Certain ________ in a cell's membrane form...

Question 17

Which of the following components contribute to the structure of the cytoskeleton of a cell?

Accepted Answer

Microtubules and actin filaments are the main components that contribute to the structure of the cytoskeleton of a cell. They provide shape, support, and enable cellular movement. Pseudopodia and motor proteins are also involved in cell movement, but they are not part of the cytoskeleton. Chloroplasts and mitochondria are organelles involved in energy production and are not part of the cytoskeleton. The cell wall and plasma membrane are outer layers of the cell that provide structure and protection, respectively, but they are not part of the cytoskeleton.

Question 18

The contents of cells are often visualized with fluorescent (glow-in-the-dark)stains.You treat a cell with a stain that makes a certain part of the cytoskeleton glow green and another stain that makes mitochondria glow red.Under the microscope,you see a meshwork of green filaments throughout the cell.Red organelles appear to be traveling along the filaments.The green stain you used must stain

Accepted Answer

The meshwork of green filaments throughout the cell suggest that they are part of the cytoskeleton. Microtubules are the largest of the three cytoskeleton filaments and are responsible for maintaining cell shape and supporting cell movement. Additionally, motor proteins use microtubules as tracks for transporting organelles and other cargo throughout the cell. Therefore, the green stain used must be staining microtubules.

Question 19

The cell in the following figure is moving by producing pseudopodia.This type of movement is a result of the reorganization of a certain component of the cytoskeleton (labeled).  Some of the various labeled lines in the figure show

Accepted Answer

Pseudopodia movement involves the reorganization of actin filaments (microfilaments) in the cytoskeleton. As the cell moves forward, the leading edge extends by the assembly of actin and the formation of pseudopodia. At the same time, the trailing edge contracts and disassembles actin to enable the movement. Therefore, the correct option is B, which states that some of the lines labeled in the figure show microfilaments disassembling at the trailing edge of movement.

Question 20

Organisms whose cells lack internal,membrane-bound organelles are classified as ________.

Accepted Answer

The answer of Organisms whose cells lack internal,membrane-bound organelles are...

Quiz 3: Cell Structure and Internal Compartments