Which of the following are heterotrophic eukaryotes with a cell wall?
a. ferns
b. mosses
c. mushrooms
d. orchids
C
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A cnidarian, which is radially symmetrical, has ________ germ layer(s)
A) no B) one C) two D) three E) four
The five distinctly different tastes that stimulate receptors on the human tongue are ________, ________, ________, ________, and ________
Fill in the blank(s) with correct word
Why is baker's yeast useful for expressing genetically engineered genes?
a. The yeast cells are best suited for making human products for medical use. b. Yeast cells are eukaryotic and so would likely be successful in expressing eukaryotic genes. c. Many inducible promoters from the yeast genome have been cloned, such as the lac operon. d. The yeast cells do not secrete their protein products.
Almost all cacti are native to the Americas, but there is a small, relatively uncommon group of plants closely related to cacti native to tropical western Africa. How can we explain this given the information in this chapter?
A) This might have been caused by divergent evolution. B) The plants might have floated across the Atlantic. C) The continents were once connected. D) All of the above are true.