Because of the natural evolution of microorganisms, it is necessary to use techniques that allow distinguishing them at the level of
A. species.
B. genera.
C. family.
D. strain.
D
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In eukaryotes, general transcription factors _____
A) are required for the expression of specific protein-encoding genes B) bind to other proteins or to the TATA box C) inhibit RNA polymerase binding to the promoter and begin transcribing D) usually lead to a high level of transcription even without additional specific transcription factors E) bind to sequences just after the start site of transcription
What is an afterimage?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. A magnifying glass could be considered a simple microscope. 2. The total magnification achieved when the oil immersion lens is used is 1,000 ×. 3. Fluorescence microscopy is often used in immunology laboratories. 4. The resolving power of electron microscopes is much better than that of compound light microscopes because the wavelength of electrons is much longer than that of visible light. 5. Primary syphilis is usually diagnosed in the clinical microbiology laboratory by the use of a scanning electron microscope.
Which environmental factor has a direct effect on an organism's rate of water loss by evaporation?
A) insect biodiversity B) wind C) plant pollination rates D) algae abundance