Exam 6: A Tour of the Cell

Which of the following would be most appropriate method to observe and measure the size of ribosomes in a eukaryotic cell?

HV 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?

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?

Thylakoids, DNA, and ribosomes are all components found in ________.

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

A mutation that disrupts the ability of an animal cell to add polysaccharide modifications to proteins would most likely cause defects in which of the following organelles or structures?

Cilia and flagella bend because of ________.

You have a cube of modelling 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?

What is a primary function of integrins?

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

In the fractionation of homogenised cells using differential centrifugation, which of the following will require the greatest speed to form pellets at the bottom of the tube?

Which of the following will have the greatest ratio of surface area to volume?

Which structure is common to plant and animal cells?

Spherocytosis is a human blood disorder associated with a defective cytoskeletal protein in the red blood cells (RBCs). What do you suspect is the consequence of such a defect?

The liver is involved in detoxification of many poisons and drugs. Which of the following structures is primarily involved in this process and, therefore, abundant in liver cells?

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

A characteristic 9 + 2 arrangement of microtubules, consisting of nine doublets of microtubules surrounding a pair of single microtubules is associated with ________.

Suppose a cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from ________.

Which of the following is present in a prokaryotic cell?

Cytochalasin D is a drug that prevents actin polymerisation. A cell treated with cytochalasin D will still be able to carry out which of the following processes?