Localized regions of plasma membranes that contain cholesterol and proteins involved in cell signaling are known as
A) gap junctions.
B) arterial plaques.
C) cadherin junctions.
D) lipid rafts.
E) plasmodesmata.
Answer: D
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Random assortment occurs between chromatids of homologous chromosome pairs
a. True b. False Indicate whether the statement is true or false
The value of indirect Gram staining from a broth culture in comparison to a agar plate culture is:
a. there is no significant difference in the results of the indirect smear technique. b. organisms tend to demonstrate natural cell shape and arrangement in liquid medium. c. organisms tend to demonstrate more growth and easier visualization from agar plates. d. none of the answers are correct.
Male tungara frogs have a call that contains a "chuck" sound that is attractive to tungara frog females, but that is absent from the calls of males in closely related species
Which of the following experiments could you use to test the sensory bias model as an explanation for the evolution of the "chuck" sound? a. test the attractiveness of recorded tungara male calls from which you have digitally removed the "chuck" on conspecific females b. test the attractiveness of heterospecific male calls on tungara frog females c. test the attractiveness of tungara frog calls with "chuck" on con- and heter-ospecific females d. test the attractiveness of tungara frog calls with "chuck" on females of an unrelated species that also has male calls with a similar "chuck" sound
A key adhesion molecule is ________, which decreases cell adherence when present in insufficient quantities.
Fill in the blank(s) with the appropriate word(s).