In the amniote egg diagram shown, the item labeled "2" is the
a. yolk sac.
b. chorion.
c. allantois.
d. amnion.
e. albumin.
C
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The plant hormone that promotes dormancy in
some plants and seeds is a. abscisic acid. b. auxin. c. gibberellin. d. ethylene. e. none of these.
Which of the following can lyse pathogenic cells?
a. interleukins b. interferons c. TNF d. complement e. all of these
The ABO blood group locus in humans provides an example of ________
A) conditional alleles B) auxotrophy C) multiple alleles D) incomplete dominance E) epistasis
The lateral movement of transmembrane proteins can be restricted by several different mechanisms. Which mechanism best describes the process by which a budding yeast cell designates the site of new bud formation during cell division?
(a) proteins are tethered to the cell cortex (b) proteins are tethered to the extracellular matrix (c) proteins are tethered to the proteins on the surface of another cell (d) protein movement is limited by the presence of a diffusion barrier