Chapter 10 Learning curve

Which answer choice is true about the motor proteins myosin and kinesin?

They both use the energy of ATP.

Which motor protein(s) participate in the movement of melanin granules in melanophores?

both dynein and kinesin

Which structures are located in the dermis of the skin?

All of these choices are correct. blood vessels sweat glands connective tissue nerve endings

Which answer choice correctly describes the skin cell type it characterizes?

Fibroblasts are a cell type found in the dermis of the skin; its primary function is to secrete extracellular matrix.

__________ is not a cellular function of microfilaments.

Movement of motile cilia

The epidermis contains several layers and receives its nutrients from the dermis by diffusion. What explains why the outermost layers of the epidermis consist of dead cells?

One of the major functions of the epidermis is forming a waterproof barrier. Once that barrier is formed, nutrients cannot pass through it and the cells beyond that layer die.

Imagine that you are examining a mouse that does not produce basal lamina in the skin. How will this mouse be different from a normal, wild-type mouse?

The cells of the epidermis would not be properly connected to form a water-resistant barrier.

A patient in a physician's office has a deep cut, and as it is being stitched up, a sample of tissue is taken for testing. Analysis of the tissue reveals it has few cells, surrounded by a large amount of extracellular matrix proteins with some blood vessels, sweat glands, and nerve cells. What kind of tissue is this?

The tissue is most likely dermis, and should also have some fibroblasts, but few keratinocytes and melanocytes.

A researcher is assessing the expression of a specific protein in cells. This protein appears as a "web" in the cytoplasm of cells. The protein is likely: Please choose the correct answer from the following choices, and then select the submit answer button.

a component of the cytoskeleton.

The basal lamina is:

a specialized form of the extracellular matrix found beneath all epithelial tissues.

A researcher is studying a population of mutant fibroblasts that fail to flatten and attach to extracellular matrix proteins on a flat surface. This is likely the result of mutations in genes encoding:

components of cell junctions.

Which structures are responsible for the shape of a cell during cell division?

cytoskeleton

Dynamic instability is a:

feature of microtubules.

Structures known as microvilli are associated with:

increased surface area for nutrient absorption.

Myosin is a motor protein that associates with:

microfilaments

Kinesin is a motor protein found attached to:

microtubules

Which is the correct decreasing order of cytoskeletal elements from largest filament diameter to smallest filament diameter?

microtubules → intermediate filaments → microfilaments

Dynein is a motor protein found attached to:

microtubules.

Many scientists are working to generate organs in vitro. In some cases, cells are seeded onto a "scaffold" shaped like the desired target organ. Such scaffolds are likely composed of extracellular matrix proteins.

true