Cells can be classified into two different categories: prokaryotic and eukaryotic. Which of the following information is needed in order to determine if an organism is prokaryotic?
A. The organism's color and mass.
B. The organism's internal structures.
C. If the organism is unicellular or multicellular.
D. The methods the organism uses to feed and move.
B. The organism's internal structures.
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The infective larvae of the parasite S. stercoralis penetrate the skin and migrate through the circulatory system to the heart and lungs. The organism enters the bronchial tree and is then swallowed, entering the digestive tract, where the organism matures into an adult worm. This parasite is classified as which type of infection?
a. Pinworm b. Threadworm c. Whipworm d. Hookworm
All of the following can contribute to
desertification EXCEPT a. drought. b. overplowing. c. overgrazing. d. farming in areas with high winds. e. all of these.
Which sentence best describes what occurs during bacterial transformation?
a. Bacteria take up pieces of DNA through infection of a virus. b. Bacteria replicate DNA molecules. c. Bacteria make replicate copies of one another. d. Bacteria take up pieces of DNA that are released as other cells disintegrate.
A karyotype:
A) can be used to diagnose Down syndrome in humans. B) reveals the autosomes but not the sex chromosomes. C) requires a haploid gamete. D) can be produced only from cells in telophase of mitosis. E) can be produced only from cells in telophase of mitosis or telophase II of meiosis.