Enzymes used to cut genes in recombinant DNA research are known as ____.
A. ligases
B. restriction enzymes
C. transcriptases
D. DNA polymerases
E. replicases
Answer: B
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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.
Which of the following is a female reproductive structure in Figure 28-1?
a. 1
b. 7
c. 5
d. 8
e. 3
Classification. Respond to the following statements with reference to the five types of white cells listed below.
A. These cells scavenge dead cells and attack bacteria directly. B. These cells recognize cell surface antigens and initiate the proliferation of lymphocytes. C. Antibody production occurs in these cells. D. These cells destroy cells infected by viruses. E. These cells kill tumor cells but are not B or T lymphocytes.
Answer the following questions true (T) or false (F)
1. Batesian mimicry involves several harmful species evolving the same kind of characteristics. 2. A mutualistic relationship involves two species who both benefit from the relationship. 3. In a commensal relationship, one species benefits while the other one is harmed.