If we continued to follow the cell lineage from question 4, then the DNA content at metaphase of meiosis II would be
A) 0.25x.
B) 0.5x.
C) x.
D) 2x.
E) 4x.
Ans: C) x.
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Experiments on competition among species within a community reveal that
A) removing a group of species has relatively little effect on a community. B) removing a single species has a stronger effect than removing a group of species from a community. C) removing a group of species has a stronger effect than removing a single species from a community. D) removing a single species has relatively little effect on a community.
The northern elephant seal was hunted almost to extinction during the 18th and 19th centuries. Less than 100 seals were left to contribute to the gene pool of their future generations. Since the early 20th century, the elephant seals have been protected by law in both the U.S. and Mexico. Over 100,000 seals now inhabit the western shores of North America, all related to the small population that survived the slaughter of hunters.Scientists fear the elephant seals may be more susceptible to disease and pollution due to
A. founder effect. B. disruptive selection. C. heterozygous advantage. D. bottleneck effect.
An exoskeleton is characteristic of ________, whereas an endoskeleton is a characteristic of ________
A) reptiles; insects B) insects; reptiles C) sea anemones; humans D) mammals; spiders
Developing a novel synthetic antimicrobial drug OFTEN begins with identifying an essential ________ in the target organisms and then making slight chemical modifications to the structure to ensure that it is ________ incorporated
a. biosynthetic precursor / competitively b. biosynthetic precursor / noncompetitively c. cofactor / competitively d. cofactor / noncompetitively