Which of the following consist of a protein coat surrounding a molecule of genetic material?
A) bacteria.
B) prions.
C) viruses.
D) protists.
E) archaea.
C) viruses.
Answer: C) viruses.
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The skin-invading molds belong to the genera
A. Epidermophyton. B. Microsporum. C. Trichophyton. D. Ixodes. E. Epidermophyton, Microsporum, AND Trichophyton.
A patient, complaining about persistent drowsiness and difficulty conceiving children undergoes a series of tests, during which it is shown that he has a significantly diminished sperm count. Excess production of which hormone could account for these symptoms?
a. luteinizing hormone b. testosterone c. melatonin d. cortisol
The structure labeled "A" is the
a. aorta. b. inferior vena cava. c. pulmonary artery. d. pulmonary vein. e. superior vena cava
The use of recombinant DNA technology to treat genetic diseases ("gene therapy") has been held back by difficulty
A) delivering cloned genes into target cells and getting the genes to function properly. B) in obtaining the appropriate sequence information from individual people. C) cloning human genes. D) in identifying human genes that cause disease. E) cloning and identifying human genes that cause disease.