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Exam 6: A Tour of the Cell

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Question 21

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Which of the following structures form cytoplasmic channels that connect adjacent plant cells through the cell walls?

A) desmosomes
B) gap junctions
C) plasmodesmata
D) tight junctions

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Question 22

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Which cell would be best for studying lysosomes?

A) muscle cell
B) nerve cell
C) bacterial cell
D) phagocytic white blood cell

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Question 23

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Which of the following statements correctly describes some aspect of protein secretion from prokaryotic cells?

The evolution of eukaryotic cells most likely involved ________.

You have a cube of modeling clay in your hands. Which of the following changes to the shape of this cube of clay will decrease its surface area relative to its volume?

A cell with a predominance of smooth endoplasmic reticulum is likely specialized to ________.

Motor proteins provide for molecular motion in cells by interacting with what types of cellular structures?

A newspaper ad for a local toy store indicates that an inexpensive toy microscope available for a small child is able to magnify specimens nearly as much as the more costly microscope available in your college lab. What is the primary reason for the price difference?

A newly discovered unicellular organism isolated from acidic mine drainage is found to contain a cell wall, a plasma membrane, two flagella, and peroxisomes. Based just on this information, the organism is most likely ________.

Which structure below is independent of the endomembrane system?

In a liver cell detoxifying alcohol and some other poisons, the enzymes of the peroxisome remove hydrogen from these molecules and ________.

H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted intercellular junctions, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments?

In plant cells, the middle lamella ________.

Researchers investigating the mechanism of vesicular transport assembled a cell-free system that included microtubule tracks, vesicles, and ATP. However, they observed no movement of transport of vesicles in this system. What were they missing?

What is a primary function of integrins?

Which of the following would be the most appropriate method to observe the movements of condensed chromosomes during cell division?

Which of the following macromolecules leave the nucleus of a eukaryotic cell through pores in the nuclear membrane?

What is the explanation for how a modern transmission electron microscope (TEM) can achieve a resolution of about 0.2 nanometers, whereas a standard light microscope has a maximum resolution of about 200 nanometers?

Tay-Sachs disease is a human genetic abnormality that results in cells accumulating and becoming clogged with very large, complex, undigested lipids. Which cellular organelle is most likely defective in this condition?

Cells require which of the following to form cilia or flagella?