The principal driving force for movement of water into and through the plant shoot is
a. passive transport.
b. sunlight.
c. root pressure.
d. upward pressure as sugar is forced into the roots.
e. pumping by the xylem cells.
B
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Experiments with ribbon worms and planaria have shown that
A. it is easy to hybridize the two species in nature. B. Pax6-related genes are not always required for eye regeneration. C. the DNA of each is sufficiently similar that they can be hybridized in a lab setting. D. their eyes are examples of convergent evolution.
The protein required for the establishment and maintenance of lysogeny in cells infected with the temperate bacteriophage lambda is the
A. lambda cos. B. lac repressor. C. lambda repressor. D. lambda Xis and Int proteins.
Answer the question using the accompanying figure. Which stage of the Plasmodium life cycle does Label A represent?
a. sporozoite b. gametocyte c. cyst d. zygote e. merozoite
GPI-anchored proteins are synthesized
a. on free ribosomes and attached to the GPI group on the outside of the ER. b. as transmembrane proteins, cleaved, and attached to the GPI group on the inside surface of the ER. c. as transmembrane proteins, cleaved, and attached to the GPI group on the cytosolic surface of the ER. d. into the lumen of the ER and attached to the GPI group on the inside surface of the ER.