All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology
Endomembrane System
Cell Junctions

Concept #1: Plant Cell Walls and Plasmodesmata

Concept #2: Extracellular Matrix and Tight Junctions

Concept #3: Desmosomes and Gap Junctions

Practice: Plant cells are connected via openings between cells called ____________________________________.

Practice: The extracellular matrix in animals is similar in function to plant cell walls, but unlike cell walls it is made mostly of _______________________ rather than ______________________.

Practice: Which type of cell junction forms a fluid barrier?

Practice: What type of cell junction fastens animal cells together?

Practice: Plant cells are held together with __________________________

Additional Problems
Nuclear pores are most similar to which of the following?  a. Desmosomes b. Microtubules c. Tight junctions d. Ion channels e. Gap junctions
Most cells are in physical contact with other cells at all times by forming permanent connections called a.  cell junctions b.  gated ion channels c.  enzymic receptors d.  G protein-linked receptors e.   cell surface markers
Small molecules or ions can pass from one cell to another througha. tight junctions.b. gap junctions.c. desmosomes.d. adhering junctions.
In plants, cell-cell junctions can only occur at gaps in the cell walls through cytoplasmic connections that form across the plasma membranes of the touching cells. These junctions are called  a. desmosomes. b. tight junctions. c. plasmodesmata. d. the cellulose matrix. e. adhering junctions.
Some plant cells have their cytoplasms linked, which permits small molecules and ions to pass from one cell to the other. These areas of cytoplasmic linkages are calleda. gap junctions.b. anchoring junctions.c. tight junctions.d. plasmodesmata. 
A junction that is a protein channel linking the cytoplasms of adjacent cells is called:  a. A tight junction b. A gap junction c. An adhering junction d. An anchoring junction e. A micro tubular junction
The channels indicated by the pointer, are _____.a. Desmosomesb. Mycorrhizae c. tight junctionsd. plasmodesmatae. gap junctions
Which of the following could plants use to transport nutrients between adjacent cells?  a. Tight junction b. Gap junction c. Plasmodesmata d. Anchoring junction e. Cell wall
You are working on a forensics team and collect some cells from a crime scene. The cells have a cell wall made up of cellulose. This sample most likely came from:  a. An animal b. A bacteria c. A plant d. A fungi e. All could be correct
What are their differences? Drag the appropriate items to their respective bins.
Tight and anchoring _______ cause cells to adhere tightly to each other.a. cellsb. proteinsc. signalsd. junctions
Name the 4 major classes of cell-cell adhesion proteins.
Explain the importance of gap junctions in intercellular communication and how this mechanism is related to cancer?
A gap junction connects which part of two cells?A. cytoplasmB. cytoskeletonC. membranesD. endoplasmic reticulum