How is it possible for the cells produced by meiosis to have undergone two nuclear divisions but have a haploid
number of chromosomes? What will be an ideal response?
Concepts to Consider: This is possible because the first nuclear division is preceded by
duplication of the chromosomes, whereas the second nuclear division is not. As a result, the
ploidy of the cells after two divisions is exactly half that of the parental cell.
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In a food web, which of the following organisms would be considered heterotrophs? Select all that apply
A. decomposers B. consumers C. primary producers D. secondary consumers
Dana Reeve, the wife of actor Christopher Reeve, died at a young age from lung cancer, although she had never smoked. Her cancer was likely caused by
A) a germline mutation. B) two somatic mutations in the same lung cell. C) exposure to carcinogens. D) stress from caring for her husband, who had a spinal cord injury.
Caring for young by both parents is most
common in a. birds. b. amphibians. c. mammals. d. reptiles. e. amphibians and reptiles.
In your biology lab, you are given a vial that contains fish urine. Your assignment is to predict whether the urine came from a fresh- or saltwater species. You discover that the urine contains a high concentration of salts. What is your prediction for the fish's habitat? What is the concentration of solutes in the fish relative to its environment?
A. Marine; hypoosmotic B. Freshwater; hypoosmotic C. Freshwater; hyperosmotic D. Marine; hyperosmotic