When cloning DNA into bacteria, the ____
a. DNA sequence is inserted into a plasmid
b. DNA sequence is inserted into the bacterial chromosome
c. linear DNA sequence is circularized, thus generating a plasmid
d. new DNA is directly introduced into the bacterial cell
e. approach depends on the species of host bacteria used in the experiment
ANSWER: 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. A strain that can grow in a minimal medium containing arginine, but NOT in a minimal medium containing citrulline or ornithine would have a mutation in the gene that encodes for A. enzyme 1. B. enzyme 2. C. enzyme 3. D. both enzymes 1 and 3. E. both enzymes 2 and 3.
Answer the following statement(s) true (T) or false (F)
1. An application of too much fertilizer will negatively affect the movement of materials in the phloem. 2. A decrease in the availability of ATP in a root cell could decrease the water potential of the cell. 3. If a mutation decreased the radius of a xylem vessel threefold, there would be an 81-fold increase in the volume of liquid moving through the vessel. 4. An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata. 5. If the proton pumps of guard cell were damaged, transpiration would decrease.
The influenza virus can infect:a
humans b. pigs c. birds d. humans and pigs e. humans, pigs and birds
Why shouldn't the origin of species according to a religious text be included in the curriculum of biology courses?
A. Most religious texts have been proven to contain false information. B. The origin of species from an intelligent designer has been superseded by more modern theories. C. Religious teachings are not scientifically testable theories. D. It is contrary to the beliefs of most scientists.