Four of the following are characteristics of viruses. Which one is the exception?
A. The outer coats of all viruses are alike.
B. The virus contains either DNA or RNA at its core, but not both.
C. Viruses infect organisms in all three domains of life.
D. Most viruses have a protein coat or covering.
E. Viral envelopes consist of host cell membrane.
Answer: A
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Knight followed up on attempts of English farmers to improve varieties of agriculture with his studies on garden peas. When he crossed two true-breeding varieties, he found all of the following: Check all that apply.
_____ All the F1 offspring had the dominant trait. _____ If both parents have the same trait, then all of their offspring will also have that trait. _____ Some F2 offspring had the dominant trait and some had the recessive trait. _____ Among the F2 offspring, more had the dominant trait and fewer had the recessive trait.
The food products most commonly contaminated with Salmonella strains are
A. meat and seafood. B. milk and cheese. C. fruit and vegetables. D. eggs and poultry
The range of a population
A. is very fluid and changes frequently in a random fashion. B. is stable and almost never changes. C. only changes after a disaster has wiped out a former range. D. changes over time due to external events. E. only changes due to iteroparity.
An adventitious root is indicated by
a. A. b. B. c. C. d. B and C. e. none of these.