Homework answers / question archive / Which type of cell needs more mitochondria than the other types of cells listed? 1 point     Pancreatic cells     Fat cells     Stomach cells     Liver cells     Muscle cells     Which of the following provides the weakest evidence that mitochondria were once free-living prokaryotes? 1 point     Mitochondria have DNA that is circular and does not have associated protein

Which type of cell needs more mitochondria than the other types of cells listed? 1 point     Pancreatic cells     Fat cells     Stomach cells     Liver cells     Muscle cells     Which of the following provides the weakest evidence that mitochondria were once free-living prokaryotes? 1 point     Mitochondria have DNA that is circular and does not have associated protein

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Which type of cell needs more mitochondria than the other types of cells listed?

1 point

 

 

Pancreatic cells

 

 

Fat cells

 

 

Stomach cells

 

 

Liver cells

 

 

Muscle cells

 

 

Which of the following provides the weakest evidence that mitochondria were once free-living prokaryotes?

1 point

 

 

Mitochondria have DNA that is circular and does not have associated protein.

 

 

Mitochondria reproduce by a process similar to binary fission.

 

 

Mitochondrial ribosomes resemble those of prokaryotes.

 

 

Enzyme pathways on mitochondrial membranes resemble those found on modern prokaryote membranes.

 

 

Mitochondria and prokaryotes both are found in a variety of sizes.

 

 

A student is looking at the organelles of a cell through an electron microscope. One organelle has a folded membrane that gives it the shape of a stack of pancakes. What is the organelle?

1 point

 

 

mitochondria

 

 

Endoplasmic reticulum

 

 

Golgi body

 

 

lysosome

 

 

nucleus

 

 

The manner in which several different ions and molecules move through a cell membrane is shown in the diagram above. For each ion or molecule, the relative concentration on each side of the membrane is indicated. Which of the following accurately describes one of the movements taking place?

2 points

 

 

 

The movement of glucose through the membrane requires ATP hydrolysis.

 

 

Glucose is transported into the cell by active transport

 

 

Na+ transport out of the cell requires ATP hydrolysis.

 

 

Na+ is transported into the cell by active transport.

 

 

In Tay-Sach's disease, death results from brain damage caused by a build-up of a fatty waste product in the brain. The enzyme (hexosaminidase) that normally digests this enzyme is missing. This enzyme deficiency has been linked to the

1 point

 

 

lysosomes

 

 

nucleus

 

 

mitochondria

 

 

endoplasmic reticulum

 

 

vesicles

 

 

Heavy smoking may impair the body's ability to move debris trapped in mucus out of the lungs by affecting the

1 point

 

 

cilia

 

 

flagella

 

 

mitochondria

 

 

cell membrane

 

 

vesicles

 

 

A scientist designed an experiment to test an artificial membrane that mimics the phospholipid bilayer of a cell. The scientist built a tube that was divided by an artificial membrane and filled with distilled water. The scientist put a known amount of a protein into the water on one side of the membrane. After some time, the scientist measured the concentration of the protein on either side of the membrane but found that there had been no change. Which of the following experimental changes would allow the scientist to observe transport of a solute across the artificial membrane?

2 points

 

 

Increase the solute concentration in the solution

 

 

Use a small, nonpolar solute instead of a protein

 

 

Increase the temperature of the solution

 

 

Add artificial aquaporins to the membrane

 

 

Which of the following scientific questions is most relevant to the model represented in the figure above?

2 points

 

 

 

Is ATP required for the transportation of sugars across the outer mitochondrial membrane?

 

 

Do the types of phospholipids in a membrane affect the rate at which molecules enter a cell by passive diffusion?

 

 

Which molecular substance is actively transported across the plasma membrane?

 

 

How does temperature affect the movement of molecules into lysosomes?

 

 

Membrane-bound organelles have been an important component in the evolution of complex, multicellular organisms. Which of the following best summarizes an advantage of eukaryotic cells having internal membranes?

1 point

 

 

Some organelles, such as mitochondria and chloroplasts, are similar to prokaryotic cells in structure.

 

 

Compartmentalization leads to a higher mutation rate in DNA, which leads to more new species.

 

 

Organelles isolate specific reactions, increasing metabolic efficiency.

 

 

Eukaryotic cells are able to reproduce faster because of the presence of organelles.

 

 

Changing the shape or morphology of the mitochondrial inner membrane can change the efficiency of mitochondrial function. Which of the following outcomes will most likely result from a change in the shape of the mitochondrial inner membrane from a highly folded surface to a smooth, flat surface?

1 point

 

 

Mitochondria will become less efficient because the inner mitochondrial membrane will become less permeable to large molecules.

 

 

Mitochondria will become less efficient because the surface area of the inner mitochondrial membranes will decrease.

 

 

Mitochondria will become more efficient because the inner mitochondrial membrane will become more permeable to ions.

 

 

Mitochondria will become more efficient because the total volume of the mitochondria will increase.

 

 

Chefs often place salad greens in water to make the vegetables crispy. What organelle is principally responsible for this increase in plant cell rigidity?

1 point

 

 

Golgi apparatus

 

 

lysosome

 

 

Smooth ER

 

 

Central vacuole

 

 

chloroplast

 

 

A 0.9% NaCl solution is isotonic to red blood cells. What happens if red blood cells are placed into a 0.9 % solution of NaCl?

1 point

 

 

They will shrink

 

 

They will burst

 

 

Nothing will happen

 

 

Crenation will occur leading to blood clots

 

 

They will expand but not burst

 

 

If a perfume bottle is broken, the scent will spread to all parts of the room. This is a result of

1 point

 

 

diffusion

 

 

osmosis

 

 

active transport

 

 

facilitated diffusion

 

 

The illustration shows the active transport of hydrogen ions through a membrane protein. Which of the following best predicts the effect of not having ATP available to supply energy to this process?

1 point

 

 

 

H+ ions will continue to move through the protein in the original direction but at a slower rate.

 

 

H+ ions will begin to move through the phospholipid portion of the membrane in the original direction.

 

 

H+ ions will stop moving through the protein

 

 

H+ ions will move in the other direction through the protein.

 

 

Testosterone producing cells in the testes would usually have large numbers of

1 point

 

 

vacuoles

 

 

lysosomes

 

 

rough endoplasmic reticulum

 

 

Golgi apparatus

 

 

smooth endoplasmic reticulum