A stage 3 society, based on the demographic transition model, would not be characterized by ____
a. an r value > 0
b. industrialization
c. a clumped population distribution
d. (K
ANSWER: e
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In a cloning experiment, you use a vector that contains a lacZ gene as a selectable marker. If the competent cells are grown on X-Gal and IPTG, which colonies would contain chromosomal DNA?
A. The white colonies B. The blue colonies C. Half the total colonies D. None of the colonies
The most numerous cells carried in the plasma are ____
a. erythrocytes b. leukocytes c. platelets d. stem cells e. epithelial cells
In the 1920s, Otto Loewi discovered that
a. a frog heart would beat outside the animal. b. the nerve to a frog’s heart released a chemical that affected only that heart. c. neuron endings release a neurotransmitter when stimulated. d. a saline solution caused an isolated frog heart deprived of its own nerve supply to beat more slowly. e. ACh acts on skeletal muscle, smooth muscle, the heart, some glands, and the brain.
The Krebs cycle is considered a cycle because ________ is regenerated
a. -ketoglutarate b. acetyl-CoA c. citrate d. oxaloacetate