BIOL2021 Quiz 10 - Chapter 19

Which of the following is NOT an anchoring junction?

Gap junction

Malignant cancer cells that have entered the bloodstream can imitate lymphocytes in exiting the bloodstream and entering underlying tissues in the process of metastasis. How can this “lymphocyte mimicry” be summarized?

An initial selectin-dependent rolling followed by an integrin-dependent adhesion and emigration

These are structurally similar to adherens junctions and contain a number of homologous components. However, they are linked to intermediate filaments instead of the actin cytoskeleton.

Desmosomes

Glycosaminoglycan chains in the extracellular matrix all contain N-acetylglucosamine.

True

What class of molecules constitute the major proteins of the ECM?

Collagen

Plasmodesmata in plant cells are functionally similar to what in animal cells?

Gap junctions

What happens in the active state of the integrin dimer?

Both intracellular and extracellular binding sites are exposed.

Which of the following is an accurate description of selectins?

They are carbohydrate-binding proteins.

What is the most common additional polymer present in the plant secondary, but not primary, cell wall?

Lignin

Which of the following cell junctions uses cadherin cell adhesion molecules to anchor the actin cytoskeleton?

Adherens junction