Speciation requires that two populations become ____ from each other
Fill in the blank with the appropriate word.
reproductively isolated
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How do phagocytes interact speedily and effectively with pathogens?
What will be an ideal response?
Cryptic female choice is a type of intersexual selection where
A. the female genital tract selects for sperm that tend to be unrelated to the female. B. the egg itself has mechanisms to prevent fertilization by genetically related sperm. C. pollen from unrelated plants is not able to fertilize an egg. D. the female genital tract and/or the egg itself prevents fertilization by genetically related sperm. E. the female chooses which male can mate with her based on cryptic coloration.
With regard to tight junctions,
A) one face of the cell, the apical surface, is in contact with other cells. B) they allow free movement of ions and molecules between cells. C) they are responsible for holding cardiac muscle together. D) they are composed of special proteins called connexins. E) they block the movement of basolateral integral membrane proteins to the apical surface.
Which of the following structures are NOT used by chemical synapses during signal transmission?
a. gap junctions b. ligand-gated receptors c. Ca2+ d. vesicles e. neurotransmitters