Choose the correct statement regarding estrous and menstrual cycles.
A. The lining of the uterus is shed during menstruation and estrous.
B. Copulation can only occur during ovulation in the menstrual cycle.
C. Ovulation only occurs in animals with a menstrual cycle.
D. Menstrual cycles are longer than estrous cycles.
E. Animals with estrous cycles are sexually receptive only when they are ovulating.
Answer: E
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a. Capillaries b. Veins c. Arteries d. Lymphatics
The parasite T. gondii is acquired via the ingestion of infected oocysts from cat feces. A diagnosis is primarily made through:
a. examination of stool. b. examination of blood films. c. observance of "jerky" motility. d. serologic means.
In the late 1870s, Charles Darwin and his son, Francis, discovered that if the tip of the grass was covered, phototropism did not occur, even though the rest of the grass was exposed to light. However, if the rest of the plant was covered and only the tip exposed to light, the grass bent a few centimeters below the tip. Which of the following was sensing the light?
A. auxin-detecting cells in the tip of the grass B. auxin-producing cells in the tip of the grass C. auxin-producing cells a few centimeters below the tip of the grass D. auxin-detecting cells a few centimeters below the tip of the grass
Jellyfish are ____
a. polyp forms of cnidarians b. medusae forms of cnidarians c. spongiforms of cnidarians d. spongiforms of echinoderms e. polyp forms of echinoderms