Alfalfa plants occur symbiotically with bacteria that can convert nitrogen gas to ammonium in a process called ________

A) nitrification B) fertilizers C) nitrogen fixation D) nitroprocessing


Answer: C

Biology & Microbiology

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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.

Biology & Microbiology

Which of the following is the correct order for the taxonomic classification of living things?

What will be an ideal response?

Biology & Microbiology

A contraceptive pill that continuously inhibits the release of gonadotropin-releasing hormone (GnRH) from the hypothalamus will _____

A) increase the production of estrogen and progesterone by the ovaries B) initiate ovulation C) reduce the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the anterior pituitary gland D) stimulate the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the posterior pituitary gland E) increase the flow phase of the menstrual cycle

Biology & Microbiology

Which avenue of research is least likely to reveal whether asexual organisms form species?

a. analyzing whether a cluster of bacteria constitutes a species b. exploring various niches in which different populations reside c. looking into previously undiscovered types of bacteria d. performing genomic research e. hybridizing polyploid plants

Biology & Microbiology