Should viruses like lambda phage be considered living entities? Or are they more properly viewed as parasitic fragments of DNA?
What will be an ideal response?
The answer depends on the definition of life; viruses are not alive under the cellular definition of life, which holds that living organisms are composed of one or more cells. They do, however, evolve by natural selection, the main criterion for life as suggested by geneticist H. J. Muller.
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________, a recombinant clotbusting drug, is used to limit damage to heart muscle by restoring blood flow.
A) Insulin B) Tissue plasminogen activator C) Interleukin-2 D) Glucocerebrosidase
A cell cycle checkpoint at which phase would ensure sufficient nutrients for cell division were available?
a. S b. prophase c. metaphase d. G1 or G2 e. G1 or S
What is the name of the structure formed when the 10 nm fibers of chromatin form a cylindrical filament of coiled nucleosomes?
What will be an ideal response?
What is the advantage of producing a seed over a spore?
A. Seeds are diploid, and can grow directly into a sporophyte. B. Seeds are haploid, and can grow directly into a sporophyte. C. Seeds are diploid, and can grow directly into a gametophyte. D. Seeds are haploid, and can grow directly into a gametophyte. E. Producing seeds over spores is a disadvantage.