No till farming is advantageous because it
A) reduces soil erosion.
B) increases yield.
C) decreases need for pesticide use.
D) decreases plant cover.
A
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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.
Today, evolutionary biologists view speciation as an event
a. True b. False
The outcome of an infection is called a(n) ________
Fill in the blank(s) with correct word
Which of these vascular tissue cells is alive but lacks a nucleus?
A. vessel element B. tracheid C. companion cell D. sieve-tube members