Carbon dioxide molecules enter the light-dependent reactions from the atmosphere.
Indicate whether the statement is true or false.
Ans: False.
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Male deer have large antlers that are used to challenge each other in fights for territory and females. The females of this group actively choose the strongest males. Which type of sexual selection is occurring with the deer population?
A. Intersexual and intrasexual selection are both occurring. B. Intrasexual selection. C. Stabilizing selection. D. Negative frequency-dependent selection. E. Intersexual selection.
What will happen if you place a turgid plant cell in a hypertonic solution? A hypotonic solution?
A. it will lose water; nothing B. nothing; it will gain water C. nothing; nothing D. it will lose water; it will gain water
The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms
A) incorporate carbon dioxide via the acetyl-CoA pathway. B) incorporate carbon dioxide via the Calvin cycle. C) incorporate carbon dioxide via the reverse citric acid cycle. D) utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism.
Which of the following genera fix nitrogen nonsymbiotically?
A. Nitrosomonas B. Nitrobacter C. Rhizobium D. Azotobacter