Cell Junctions

Plasmodesmata in plant cells are analogous to what structure in animal cells?

• Tight junctions

• Gap junctions

• Adhesion junctions/Desmosomes

• Vacuoles

Urine is confined to the human bladder in part due to the structure of junctions that connect the cells lining the bladder. These junctions form a barrier that prevents the exchange of ions and solutes between the blood and urine. What is the likely identity of these junctions?

• Gap junctions

• Tight junctions

• Desmosomes

• Plasmodesmata

Which type of cellular junction is prominent in cardiac myocytes and allows for a unified contraction of the heart? Hint: in order for these cells to contract in unison, ions need to flow rapidly between them.

• Tight

• Desmosomes

• Gap

• Plasmodesmata

Which of these correctly matches the cellular junction with its function?

• Gap junctions prevent the flow of ions and water from one part of the body to another

• Adhering junctions (AKA desmosomes) are branched network of proteins that are impermeable to fluids

• Gap junctions are connections that directly connect the cytoplasm of two cells

• Tight junctions are random, spot attachments between cells that prevent tearing of tissue

Platelets are small cellular fragments that have no nucleus. Their job is to clot together at tears and cuts in the skin to prevent bleeding out of the organism. Which type of junction would you expect to form between platelets?

• Gap

• Tight

• Adhering/Desmosomes

• Plasmodesmata

"Water Loving"

• Hydrophobic
• Hydrophilic 
• Hydroelectric 
• Hydroloric

Tags

NGSS.HS-ESS2-5

"Water Fearing" 

• Hydrophobic
• Hydrophilic 
• Hydroelectric 
• Hydroloric

What forms the channels and pumps in the phospholipid bilayer?

• carbohydrates
• proteins
• hydrophilic heads 
• lipids

Bind cells together, prevent molecules from passing in between the cells, and also help to maintain the polarity of cells.

• Desomosomes

• Gap junctions

• Tight Junctions

• Connexons

The membranes of cells are spot welded together to form reinforced structural units. Skin cells have these kind of junctions.

• gap junctions
• tight junctions
• desmosomes