The ultimate source of new alleles and genetic variability is _____________________. Fill in the blank(s) with the appropriate word(s)
mutations
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Scientist believe that the formation of organic polymers, like RNA and DNA, had to move from the watery environment of the seas to solid surfaces or evaporating tidal pools because
A. dehydration is necessary for the formation of large organic polymers, too much water competes with dehydration. B. hydrolysis is necessary for the formation of large organic polymers, dehydration competes with polymerization. C. tidal pools would provide a concentrated area where more small organic molecules could aggregate. D. Kusky discovered 1.43 billion year old fossils in shallow water and tidal pools. E. sugars dissolve in water, ribose is a sugar and is necessary for the polymerization of DNA and RNA therefore being out of the water would speed up the polymerization reactions.
You isolate a plant that expresses a phytochrome mutant that is always in the
Pfr form. You expect these plants will germinate A. not at all. B. regardless of the light conditions. C. later than normal plants. D. similarly to normal plants.
Which term refers to prokaryotes that are cylindrical?
a. cocci b. spirilla c. vibrios d. bacilli
Superantigens produced by Staphylococcus aureus are a class of antigens that cause non-specific activation of T cells resulting in their activation and massive cytokine release which may harm the host
a. true b. false