One way to improve crop productivity is to modify flowering time. This can allow for multiple growing seasons in one year, and can also increase grain production because a smaller plant has lower resource needs. You are approached by an agricultural company that wants to create an early-flowering transgenic plant. Using your knowledge of Arabidopsis genetics, which genetic modifications would you suggest?
A. Inhibition of the embryonic flower (EMF) gene or overexpression of the LEAFY (LFY) gene would work.
B. Early flowering is not possible in Arabidopsis, and is not likely to be possible in other plants.
C. Inhibition of either the embryonic flower (emf) gene or the LEAFY (LFY) gene would work.
D. Inhibition of the LEAFY (LFY) gene or overexpression of the embryonic flower (emf) gene would work.
Answer: A
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When would Koch's postulates be utilized?
A. to determine the cause of a new disease in a microbiology research lab B. to determine the cause of a patient's illness in a hospital microbiology lab C. to develop a new antibiotic in a pharmaceutical lab D. to formulate a vaccine against a new pathogen in a genetic engineering lab E. whenever the scientific method cannot be used to investigate a microbiological problem
Under what environmental conditions do yeast carry out fermentation?
A. high osmotic pressure B. low pH C. high temperature D. absence of oxygen E. All of the choices are correct.
Halobacterium has a photosynthetic membrane that appears purple. Its photosynthetic action spectrum is the inverse of the action spectrum for green plants
(That is, the Halobacterium action spectrum has a peak where the green plant action spectrum has a trough.) What wavelengths of light do the Halobacterium photosynthetic pigments absorb? A) red and yellow B) blue, green, and red C) green and yellow D) blue and red
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a. Can be subcultured. b. Developed resistance to antibiotics. c. Were killed by 0.125 g/ml of antibiotic X. d. Were killed by 0.5 g/ml of antibiotic X. e. Were resistant to 1.0 g/ml at the start of the experiment.