In older men, the inability to get or keep an erection firm enough for sexual intercourse is usually the result of injury, disease, or the side effects of medication and is called
A. erectile dysfunction.
B. infertility.
C. sterility.
D. menopause.
A. erectile dysfunction.
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With Clostridium perfringens, the enterotoxin is present in the endospores that germinate under anoxic conditions
Indicate whether the statement is true or false.
Which technique did Rosalind Franklin use to determine many aspects of DNA’s structure?
a. transformation b. transmission electron microscopy c. density-gradient centrifugation d. x-ray crystallography e. chromatography
A photosystem II complex is under normal light conditions, how often might you expect that it needs to be repaired?
a. 10 minutes b. 20 minutes c. 30 minutes d. 60 minutes
The human reproductive system is regulated by
A. restriction enzymes B. antigens C. complexcarbohydrates D. hormones