Which of the following is not a typical capsid shape?
A. Helical
B. Tetrahedral
C. Complex
D. Icosahedron
Answer: B
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A human cell and a mouse cell were experimentally fused, and the results demonstrated that ________
a. proteins cannot move laterally in the membrane b. large polar molecules can enter cells only through transport proteins c. proteins can move laterally in the plasma membrane d. human/mouse chimeric embryos are not viable
By the end of the Devonian period, which of the following plants populated the landscape?
a. flowering plants and trees b. mosses and other bryophytes c. ferns, horsetails, and seed plants d. algae and early vascular plants
Most fresh water exists as:
a. ice b. soil water c. aquifer water d. surface water (lakes, rivers) e. atmosphere
Nutrients and antibodies move across the placenta from mother to embryo or fetus, as do __________,
which can cause birth defects. Fill in the blank(s) with the appropriate word(s).