The classic experiment using isolated cells from two species of sponges provided evidence that:
A. Cell adhesion molecules are species
specific.
B. Sponge cells posses an extracellular
matrix.
C. Cell adhesion molecules are non-specific.
D. Sponge cells have cell adhesion
molecules.
A
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The benthic community of an ocean, with the exception of hydrothermal vents, is best described as
A) completely heterotrophic and very diverse. B) completely autotrophic and very diverse. C) completely phototrophic and not very diverse. D) mostly heterotrophic and not very diverse.
Which of the following chemicals' concentration is NOT increased by an elevation in metabolic activity?
A) carbon dioxide B) oxygen C) hydrogen D) potassium E) pyruvic acid
Explain how the use of sequencing technologies finally brought the search for the HD gene to a close as reported by the Huntington's Disease Collaborative Research Group
What will be an ideal response?
Which of the following does not occur when you are very, very cold?
A. You get goose bumps. B. The arrector pili muscles contract. C. Shivering occurs. D. Smooth muscle contracts inside the blood vessels supplying the skin. E. More blood flows to the surface of the body.