The only marsupial mammal living in North America is the
A. weasel.
B. raccoon.
C. wombat.
D. opossum.
E. ring-tailed cat.
Answer: D
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Industrial smog causes air to turn
a. gray. b. black. c. brown. d. red. e. blue.
A karyotype reveals:
a) the shape of the spindle. b) 23 pairs of chromosomes. c) the number, shapes, and sizes of chromosomes in an individual cell. d) the sex chromosomes but not the non-sex chromosomes. e) the non-sex chromosomes but not the sex chromosomes.
Most of the dry mass of a plant is derived from _____
A) NO3- and CO2 B) K+ and CO2 C) PO4 and K+ D) H2O and K+ E) H2O and CO2
Match the following items to the correct phrase.
_______1. Viruses that infect bacteria and cause the lytic cycle to occur. _______2. Term meaning complete viral particles. _______3. Are known to cause some plant diseases, but no animal diseases. _______4. Infectious protein molecules. _______5. Infectious molecules of RNA. _______6. Cause diseases such as Creutzfeldt-Jacob disease, “mad cow disease,” and “scrapie.” a. viroids b. virions c. prions d. temperate phages e. virulent phages