Which of the following can be used for the cultivation of viruses?
A.) Enriched broth media
B.) Viral host cells grown in vitro
C.) Enriched agar media
D.) All of these choices.
B.) Viral host cells grown in vitro
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Hybridization between different species is rare because it ____
a. requires the breakdown of a barrier preventing interbreeding b. causes lethal mutations in hybrid offspring c. leads to the exchange of genes between closely related species
d. leads to gene flow between species e. contradicts the species concept
James Watson and Francis Crick ____
a. were both English researchers working at Cambridge University b. performed elegant experiments in DNA chemistry c. constructed an accurate model of DNA’s double helix structure d. performed experiments that convinced scientists that DNA is a double-stranded molecule e. used x-ray diffraction in all of their experiments
The threads that make up the mycelium of a fungal body are called:
a. yeast. b. thallium. c. spores. d. hyphae. e. fruiting bodies.
In the female gametophyte, two cells flanking the egg secrete a ________ that guides the pollen tube's growth from the bottom of the style to the egg.
Fill in the blank(s) with the appropriate word(s).