Roughly half of all adults in the United States are infected with ________ but are asymptomatic
A) Toxoplasma gondii
B) Trichomoniasis vaginalis
C) Cryptosporidium parvum
D) Cyclospora cayetanensis
Answer: A
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In some male songbirds, long winter nights lead to an increase in melatonin secretion. The rise in melatonin indirectly prevents singing and other courtship behaviors by slowing secretion of which hormone?
a. testosterone b. estrogen c. thyroid hormone d. follicle stimulating hormone e. growth hormone
Which of the following statements concerning gene regulation in eukaryotes is FALSE?
a. The organization of tissues and organs is regulated mainly via transcription. b. Some eukaryotic genes are constitutive. c. Eukaryotic genes do not usually form operon-like clusters. d. "Housekeeping" enzymes are expressed at all times. e. Eukaryotic cells lack inducible genes.
You are out working in your garden, and you notice that one of your favorite flowering plants has black, dead spots on the leaves. You immediately suspect that the plant has been invaded by a pathogen and has initiated a(n) _____
A) avirulence response B) hypersensitive response C) resistance response D) virulence response
Hanna, 18 years old, is over 6 feet tall. She has an x-ray film taken that shows that her long bones are continuing to lengthen. Eventually, a thorough examination shows that she has a tumor growing in her ________
A) anterior pituitary B) pineal gland C) adrenal medulla D) posterior pituitary