Direct penetration of which of the following worms results in tissue damage at the site of attachment, blood loss, and an acute gastrointestinal phase demonstrated by an increased eosi-nophilia?
a. Whipworm
b. Pinworm
c. Threadworm
d. Hookworm
D
With direct penetration of the hookworms A. duodenale and N. americanus, tissue damage at the site of attachment, blood loss, and an increased eosinophilia are observed in the gastrointestinal phase. Increased worm burden may result in death, particularly in young children.
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Sharks and rays deal with the osmotic stress of living in seawater mainly by
a. active transport of ions into the body through the gills. b. excreting nitrogenous wastes through their kidneys as urea. c. active transport of ions out of the body by chloride cells. d. excreting excess salt through the actions of specialized salt glands in their heads. e. maintaining high levels of urea and trimethylamine oxide in body fluids.
Fruit is produced from the development of the
a. egg. b. ovule. c. megaspore. d. endosperm. e. ovary
Which of the following statements about the
prostate is FALSE?
a. Prostate enlargement can be a symptom of prostate cancer. b. Prostate cancer is the leading cause of death in males. c. In young men, the prostate gland is the size of a walnut. d. The urethra runs through the prostate gland. e. The prostate gland is directly below the urinary bladder.
All of the following describe characteristics of sclerenchyma cells, except which?
A. Their secondary walls may be impregnated with lignin. B. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. C. They have thick, tough secondary walls. D. They lack living protoplasts when mature. E. They form fibers and sclereids.