Laboratory-based genetic systems have been difficult to develop for Archaea, because they do NOT naturally undergo conjugation or transduction
Indicate whether the statement is true or false.
Answer: FALSE
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Because most herbivores do not produce cellulase, they have specialized compartments in their digestive tracts that (select all correct choices):
A. provide appropriate temperature and pH for breaking down plant material. B. house large populations of bacteria and other single-celled symbionts that do produce cellulase. C. grind up the plant material using muscular gizzards or other structures. D. secrete alternative enzymes that carry out the same function as cellulase. E. ferment nutrients in the hindgut.
Approximately 40% of all children with Down syndrome have congenital ____________________ defects.Fill in the blank(s) with the appropriate word(s)
Viruses
A. consist of only a single cell. B. are smaller than cells. C. consist of multiple cells. D. contain a nucleus. E. are alive.
Which technology was first established by Cro-Magnon?
Select one: a. throwing spears b. scrapers c. controlled fire d. group life e. All of the answer choices are correct.