Lecture 12 LaunchPad Assignment BIO 2170

Match the following descriptions with the specific type of cellular junction listed below. 1. Adherens junctions 2. Tight junctions 3. Desmosomes 4. Hemidesmosomes a. cell junctions that anchor cells to other cells b. cell junctions that anchor cells to the extracellular matrix c. cell junctions that form a seal or a barrier between cells

1-A 2-C 3-A 4-B

Match each description below with the cell type it characterizes. 1. Major cell type found in the dermis of the skin; its primary function is to secrete extracellular matrix. 2. Major cell type found in the epidermis of the skin; its primary function is the production of pigment. 3. Major cell type found in the epidermis of the skin; its primary function is to protect underlying tissues and organs. a. melanocyte b. fibroblast c. keratinocyte

1-B 2-A 3-C

Intermediate filaments: - All of these choices are correct. - have a diameter that is larger than a microfilament, but smaller than a microtubule. - play an important role in maintaining cell shape. - undergo little change in length in comparison to microtubules and microfilaments. - play an important role in preventing skin from tearing by shear stress.

All of these choices are correct.

Which one of the following statements about intracellular transport is TRUE? - Kinesin and dynein move substances along microfilaments. - Kinesin moves substances along microfilaments. - Kinesin and myosin move substances along microtubules. - Kinesin and dynein move substances along microtubules.

Kinesin and dynein move substances along microtubules.

Which one of the following CORRECTLY lists components of extracellular matrix found in animals? - collagen, laminin, and elastin - lignin, pectin, and keratin - collagen, lignin, laminin, and pectin - cellulose, pectin, lignin

collagen, laminin, and elastin

Dynamic instability is a: - feature of microfilaments. - feature of microtubules and microfilaments. - feature of intermediate filaments. - universal feature of the cytoskeleton. - feature of microtubules.

feature of microtubules.

Which of the following enable(s) the movement of cells? - microfilaments - microtubules - intermediate filaments - microfilaments and intermediate filaments - microtubules and microfilaments

microtubules and microfilaments

The cytoskeleton of plant cells includes: - microtubules, microfilaments, and intermediate filaments. - actin, microfilaments, and intermediate filaments. - tubulin, microfilaments, and intermediate filaments. - microtubules and microfilaments. - actin, microtubules, and intermediate filaments.

microtubules and microfilaments.

Cadherins are: (Select all that apply.) - proteins involved in the attachment of cells to neighboring cells. - proteins involved in the attachment of cells to the extracellular matrix. - proteins that provide a pathway for molecules to move between cells. - cell adhesion molecules found in cell junctions.

proteins involved in attachment of cells to neighboring cells. cell adhesion molecules found in cell junctions.

Cilia are: (Select all that apply.) - None of the other answer options are correct. - specialized structures, which extend from some epithelial cells. - used by sperm cells for locomotion. - used by epithelial cells to move substances along the cell surface

specialized structures, which extend from some epithelial cells used by epithelial cells to move substances along cell surfaces.