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TLS Online TPP Program

#Question id: 2597

How do the different types of actin-binding proteins relate to the ability of actin to form bundles and networks?

#Unit 2. Cellular Organization

  1. Proteins promoting bundle formation have one actin-binding site, whereas proteins promoting network formation have two actin-binding sites.

  2. Different types of actin bind different actin-binding proteins to form bundles or networks.

  3.  Proteins that promote bundle formation bind ADP-actin, whereas proteins that promote network formation bind ATP-actin.

  4. Proteins promoting bundle formation tend to be short and inflexible, whereas proteins that promote network formation tend to be longer and more flexible.

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TLS Online TPP Program

#Question id: 2543

#Unit 2. Cellular Organization

Which of the following is the most common pathway taken by a newly synthesized protein that will be secreted by a cell?
TLS Online TPP Program

#Question id: 2544

#Unit 2. Cellular Organization

Asbestos is a material that was once used extensively in construction. One risk from working in a building that contains asbestos is the development of asbestosis caused by the inhalation of asbestos fibers. Cells will take up asbestos by phagocytosis, but are not able to degrade it. As a result, asbestos fibers accumulate in ________.
TLS Online TPP Program

#Question id: 2545

#Unit 2. Cellular Organization

If plant cells are grown on media containing radioactively labeled thymine for one generation, radioactively labeled macromolecules will be detected in which of the following?
TLS Online TPP Program

#Question id: 2546

#Unit 2. Cellular Organization

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

#Question id: 2547

#Unit 2. Cellular Organization

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

#Question id: 2548

#Unit 2. Cellular Organization

The cell walls of bacteria, fungi, and plant cells, and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following characteristics are common to all of these extracellular structures?