The most prominent organelle visible in most eukaryotic cells is the
A. cell membrane.
B. endoplasmic reticulum.
C. nucleus.
D. mitochondrion.
E. chloroplast.
C. nucleus.
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. Which biological process accounts for the oscillating pattern observed in this dataset?
A. photosynthesis B. respiration C. More information would be needed to answer this question.
Muscles exert force by
a. expanding in one direction. b. expanding in either of two directions. c. pushing in one direction only. d. pulling in one direction only. e. pushing or pulling.
After dinosaurs became extinct, the number of mammal species increased greatly. What process applies to this example?
A) adaptive radiation B) endosymbiosis C) competition D) eukaryotic development
A biologist studying evolution starts with a single cell of E. coli and grows a population of one billion bacteria from it. Which rule of Hardy-Weinberg must be broken first before evolution will occur in this population?
a. no new mutations b. large population size c. no natural selection d. random mating