Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood
A) pH. B)PO2.
C) PCO2.
D) PCO2 andPO2.
E) PO2, pH, andPCO2.
Answer: E) PO2, pH, andPCO2.
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Two-thirds of terrestrial environments support growth of termites
Indicate whether the statement is true or false.
Bread mold can grow in a minimal medium without supplements (wild type) while certain mutated strains (mutants) can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis:
minimal ------> ornithine -------> citrulline ------> arginine, where enzyme 1 converts the precursor to ornithine, enzyme 2 converts ornithine to citrulline, and enzyme 3 converts citrulline to arginine. Which of the following would be TRUE of a strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone? A. The strain would have a mutation in the gene that encodes enzyme 1. B. The strain would have a mutation in the gene that encodes enzyme 2. C. The strain would have a mutation in the gene that encodes enzyme 3. D. The strain would have a mutation in the gene that encodes for enzymes 1, 2, and 3. E. The strain would be the wild type with no genetic mutations.
On both the eastern and western coasts of the USA, the subtidal zone contains very productive
a. seagrass meadows. b. Laminaria seaweeds. c. Ulva flats. d. both a and b e. both b and c
Four of the following features are important evolutionary advancements in the evolution of the tree-dwelling primates
Which one is the exception? a. grasping hands and feet b. depth perception c. well-developed sense of smell d. the ability to see in 3D e. a large brain relative to body size