Buttress roots help trees obtain oxygen from flooded soil
____________________ Indicate whether the statement is true or false.
F, Pneumatophores
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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.
Data from what source led to the hypothesized relationship between the Craniata and nonvertebrate chordates?
A. the vertebrae. B. DNA. C. rRNA. D. external features.
When a land bridge connecting two continents
is cut off due to rising sea levels, this can lead to
a. sympatric speciation. b. disruptive selection. c. directional selection. d. hybrid sterility. e. allopatric speciation
Which of the following is an action of the sympathetic nervous system?
a. to increase stomach activity b. to decrease heart rate c. to dilate the pupils d. to stimulate intestinal activity e. to decrease blood pressure