Four of the five choices listed below are derived
from the same germ layer. Select the exception.
a. kidney
b. brain
c. muscle
d. respiratory system
e. skeleton
Answer: b
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What is one of the ways plants overcome dispersal issues associated with vegetative reproduction?
A. Horizontal stems grow away from the parent, allowing new shoots to grow at a distance from the parent. B. Specialized seed coats can enable wind dispersal. C. Fruits encourage animal-assisted dispersal. D. Plantlets cluster near the parent plant. E. Plant dispersal is not an issue for vegetatively reproducing plants.
The United States has used export subsidies to encourage the exportation of
a. steel. b. agricultural products. c. automobiles. d. computers.
How were mutants used to order the sevenless-Ras pathway?
A) Cells that expressed a constitutively active Ras mutant protein did not require Sevenless activation to become R7. B) Cells that expressed a constitutively active Sevenless mutant protein did not require Ras activation to become R7. C) Cells that expressed an inactive Ras mutant protein did not require Sevenless activation to become R7. D) Cells that expressed a constitutively-inactive Sevenless mutant protein did not require Ras activation to become R7.
Agglutination tests make use of the fact that
A) antibodies have two antigen-binding sites and will cause clumping when bound to antigen. B) the presence of antibodies in a patient's serum will prevent viral infection of cells in culture. C) a reporter enzyme can be bound to an antibody to provide a visual change with a positive test. D) antibodies bound to antigen will precipitate in a gel matrix. E) T cells will release interferon-gamma during certain infections.