One element that does not cycle into the atmosphere is phosphorus
____________________ Indicate whether the statement is true or false.
True
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Adenine and thymine form _______ hydrogen bonds between them, while cytosine and guanine form _______ bonds
A. 2 , 3 B. 3 , 4 C. 3 , 2 D. 4 , 3
What is one advantage of using transgenic plant cells to produce human proteins for hormone replacement therapy?
a. Transgenic plants produce lower protein yields than transgenic animals. b. Transgenic plants produce higher protein yields than transgenic animals. c. Plant cells are less expensive to grow than other cell types d. Transgenic animals cannot produce human proteins. e. HIV is spread through proteins harvested from transgenic animals.
In the figure below, if food were the limiting factor in reproduction, how would the line change if unlimited food were available?
A) The line would slope up rather than down. B) The line would not change direction, but the clutch size values would significantly increase at each density. C) The line would be horizontal. D) The line would not change
Which of the following statements best describes secondary endosymbiosis?
A. A host cell ingests two or more symbionts simultaneously. B. A host cell without plastids ingests a prokaryotic cell. C. A host cell manufactures its own symbiont and later acquires another one by phagocytosis. D. A host cell ingests another cell already containing a primary symbiont. E. A host cell ingests one symbiont and then later ingests another one.