Why is human blood clotting factor VIII produced by genetically engineered bacteria better to treat
hemophilia type A than the clotting factor isolated from human or animal blood?
a. Recombinantly produced clotting factor has a longer shelf life than natural clotting factor.
b. Clotting factor isolated from blood can transmit infectious agents.
c. Clotting factor isolated from human blood can cause transfusion reactions.
d. Recombinantly produced clotting factor is free of blood thinning factors.
e. Natural clotting factor from blood is not very active.
B
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Which of these time intervals, based on plant fossils, came last (most recently)?
A) extensive growth of gymnosperm forests B) Silurian-Devonian explosion with fossils of plant lineages that contain most of the major morphological innovations C) colonization of land by early liverworts and mosses D) rise and diversification of angiosperms E) carboniferous swamps with giant horsetails and lycophytes
Hydrogen ions cross the thylakoid membranes from the stroma by
A) simple diffusion. B) osmosis. C) facilitated diffusion. D) synthesis. E) active transport.
Because most birds travel through the air at high speeds, they must have
a) highly sensitive sensory systems. b) eggs and no placenta. c) a crop and a gizzard. d) complex songs. e) a three-chambered heart.
Sperm cells are the only type of cell in animals that have:
A) cilia. B) a flagellum. C) pili. D) cytoplasm. E) genetic material.