The observable expression of the genes present is called
A. genotype
B. karyotype
C. epistasis
D. phenotype
D. phenotype
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Which of the following is a Gram-negative bacterium that acts as a predator on other Gram-negative bacteria, and might be used to control populations of Gram-negative human pathogens in locations such as poultry farms?
A. Salmonella enteritidis B. E. coli C. Vibrio choerae D. Bdellovibrio
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.
All of the following are examples of nonmuscle motility and contractility except
A) microsome formation. B) pseudopodia formation. C) cytoplasmic streaming. D) actin polymerization of Listeria. E) phagocytosis.
What is the correct sequence for the development of a eudicot embryo?a. Globular stageb. Heart stagec. Proembryo staged. Mature embryoe. Zygote formsf. Torpedo stage
A. d - e - a - b - f - c B. e - c - a - b - f - d C. e - b - c - a - f - d D. d - a - e - b - f - c