Which of the following statements is true about the flight muscles of a fly?
A. They are attached underneath the cuticle.
B. They are attached to the wings directly.
C. They pull the wings down when the vertical muscles contract.
D. They change the shape of the thorax.
E. They pull the wings up when the longitudinal muscles contract.
Answer: D
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Thalidomide is
A) a drug that causes fetal limb defects, but is used to treat leprosy. B) a drug that causes mental retardation in fetuses, but is used to treat acne. C) a type of bacterial infection. D) a vitamin that harms fetuses in megadoses.
Which of the following series correctly represents the hierarchical organization within ecology?
a. ecosystem ? population ? community ? biosphere b. biosphere ? community ? population ? ecosystem c. community ? population ? ecosystem ? biosphere d. population ? community ? ecosystem ? biosphere e. population ? ecosystem ? community ? biosphere
A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S and the end of G2?
A) 8; 8 B) 8; 16 C) 16; 8 D) 16; 16
How do the reproduction of human immunodeficiency virus (HIV) and bacteriophage lambda differ from each other?
A. HIV production requires integrase, while bacteriophage lambda does not B. bacteriophage lambda attaches to specific proteins on the cell surface, while HIV does not C. HIV encodes and uses reverse transcriptase, while lambda phage does not D. HIV can reproduce in either eukaryotic or prokaryotic cells, while bacteriophage lambda can only infect bacteria E. None of the answers are correct.