Which of the following correctly displays the sequence of developmental milestones?
A) blastula ? gastrula ? cleavage
B) blastula ?? cleavage ? gastrula
C) cleavage ? gastrula ? blastula
D) cleavage ? blastula ? gastrula
E) gastrula ? blastula ? cleavage
Answer: D
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The carbon cycle begins with ________.
A. anaerobic respiration B. aerobic respiration C. the conversion of carbon dioxide to methane D. carbon dioxide fixation
In a chi-square test to determine if two genes are linked or assorting independently, what is the default (null) hypothesis that is tested?
A. The genes are linked to one another B. The genes are assorting independently C. The genes are located on the sex chromosomes D. No crossing over occurs E. The distance between the genes is very small
A transverse plane is indicated by
a. A. b. B. c. C. d. D. e. E.
In an experiment observing yeast respiration, Douglas notes that during the first day, carbon dioxide was produced. After three days, alcohol was produced. Which statement below would explain these results?
A) The yeast cells were going through aerobic respiration for the first two days of the experiment then the cells switched to anaerobic respiration when the available oxygen was gone from the vessel. B) The alcohol is formed from decaying yeast cells. Three days is the normal life span of a yeast cell. C) It took three days for the yeast cells to finish a fermentation cycle to produce the alcohol. D) Alcohol is formed from carbon dioxide when present with yeast, and the concentration of carbon dioxide had to be high enough for that reaction to occur.