Subacute encephalitis may be caused by ________.
A. prions
B. Toxoplasma gondii
C. persistent measles virus
D. herpes simplex virus
E. All of the choices are correct.
Answer: E
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Researchers are interested in the genomes of prokaryotic species for all of the following reasons EXCEPT
A. bacteria cause many diseases that affect people, plants, and animals. B. bacteria reveal modes of infection. C. bacteria are more highly advanced than humans. D. the origin of the first eukaryotic cell probably involved a union between an archaeal and a bacterial cell. E. All of the choices are reasons for studying genomes of prokaryotic species.
What is a seed?
A. a mature pollen B. a diploid embryo C. a mature sporophyte D. a diploid spore E. a haploid gametophyte
Which phrase describes how identical twins can result?
a. from the fusion of two paternal gametes with a single maternal gamete that then divides b. from a lack of chromosomal separation during meiosis, resulting in gametes that are diploid and do not need to be fertilized c. from the fusion of two sets of identical gametes d. from a division of a zygote into two separate cells that develop into two separate embryos
When Luria and Delbruck assayed bacterial growth on the petri plates, what did they find?
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. A) All plates had some bacterial colonies; some plates had more bacterial colonies than others. B) Some plates had no bacterial colonies; others had varied numbers of colonies. C) All plates had a similar number of bacterial colonies. D) Some plates had no bacterial colonies; all of the other plates had a similar number of bacterial colonies. E) No bacterial colonies formed on any of the plates.