Gap junctions and plasmodesmata have what feature in common?
A. They both allow direct transport of
materials between cells.
B. They both are made up of protein subunits
located in the plasma membrane.
C. They are both found in plant cells.
D. They both attach to the cell's cytoskeleton.
A
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Which one of the following is a signal that induces multicellularity of choanoflagellates?
A. the presence of predators in the environment B. the presence of the preferred prey/food source in the environment C. the developmental signal molecules that induce differentiation D. the cell migrations that take place in the developmental phases of growth
Unspecialized structures in embryos that develop into female sex organs are the
A) Mullerian ducts. B) Wolffian ducts. C) oocytes. D) Barr bodies.
Which of the following occurs fourth in the eutrophication process?
a. Bacteria use oxygen to decompose plant material. b. Prolific plant and algal growth occurs. c. Nutrients enter the body of water. d. A drop in oxygen occurs that may cause a fish kill. e. Plants and algae die during winter months.
Homeotic genes are
a. base sequences complementary to sequences in microRNA b. master control genes that regulate organs that develop in specific parts of the body c. parts of the silencing complex that regulates gene action through RNA interference d. regulator genes that bind to operons in prokaryotes