Unlike single-celled organisms that have direct contact with their external environment, most cells in a multicellular
organisms do not have direct contract with their external environment. How do these cells acquire nutrients and eliminate
wastes?
a. by active and passive transport between the basal lamina and the interstitial fluid
b. by active and passive transport between the basal lamina and the plasma
c. by active and passive transport between the intracellular fluid and the interstitial fluid
d. by active and passive transport between the intracellular fluid and the plasma
e. through gap junctions between the intracellular fluid and the plasma
ANSWER: c
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The kinase central to second messenger signalling based cAMP is
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A cell is minimally defined by which of the following:
a. an organized chemical system. b. specialized molecules. c. a nucleus. d. a membrane. e. an organized chemical system and specialized molecules surrounded by a membrane.
An asexually reproducing individual is indicated by
a. A. b. B. c. C. d. D. e. E.
In sweet peas, genes C and P are necessary for colored flowers. In the absence of either (__ pp or
cc __), or both (cc pp), the flowers are white. Give the probable genotype of a plant with colored flowers and a plant with white flowers that produced 38 plants with colored flowers and 42 plants with white flowers. What will be an ideal response?