True or false: autosomal trisomies are associated with the X or Y chromosome
A. true
B. false
B
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Which of the following genera produce numerous useful antibiotics?
A. Clostridium B. Leuconostoc C. Helicobacterium D. Bacillus
Where in the body does the circadian clock act to control of vascular disease?
a. Systems under positive feedback control. b. Systems under negative feedback control. c. Systems that develop early in life. d. Systems that develop later in life. e. It is not known.
In your fertility clinic, you look at the lab results of a young man. He has a prostate gland the size of a golf ball, a fructose-rich semen, and 10 million sperm per ml. His sperm consist of little more than DNA, mitochondria, and a flagellum, with almost no cytoplasm. Also, he has follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in his bloodstream. Which of these is the likely cause of his fertility problems?
A. enlarged prostate gland B. fructose in the semen C. sperm count D. sperm morphology E. FSH and LH
In a flowering plant, which structure includes the ovary?
a. the stamen b. the ovule c. the calyx d. the carpel