Explain the functions of adhesion junctions, gap junctions, and tight junctions in human cells.
What will be an ideal response?
Adhesion junctions serve to mechanically attach adjacent cells to each other. This type of junction allows movement of molecules between connected cells. It forms a porous type of barrier.
Gap junctions serve to communicate information between cells. It forms a channel that allows for the rapid movement of molecules from one cell to the next.
Tight junctions make solid connections between adjacent cells. These form a solid barrier.
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An agriculturalist is very concerned because his wheat crop is suddenly covered with red streaks. When consulted, you identify the issue as a condition known as rust. What would you advise the agriculturalist is the best preventive strategy for addressing the cellular basis of the rust?
A. Rust is caused by fungi that give a reddish cast to soils in which they grow, which is taken up by the plant. Treat the soil to prevent the uptake of the rust-causing fungi. B. Rust is caused by fungi that have reddish spores that emerge from the leaves of infected plants. Treat the plant to eliminate the fungi that causes the rust. C. Rust is caused by fungi that have enzymes for breaking down plant structure. Treat the plant to make it resistant to the enzymes that are causing the rust. D. Rust is caused by rust-colored mushrooms produced as fruiting bodies. Treat the plant to eliminate the fruiting bodies that are recognized as rust.
The ABO blood types have ____ different
genotypes.
a. 4 b. 6 c. 8 d. 12 e. 16
DNA varies from species to species in
a. how much adenine binds with thymine rather than with cytosine. b. whether DNA is a double or a single helix. c. the variation in the backbone structure. d. how many different bases it contains. e. its sequence of DNA base-pairs
In terms of cell signaling, estrogen in animal cells works in a similar fashion as the plant hormone auxin via binding to intracellular receptors.
Answer the following statement true (T) or false (F)