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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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
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.