In agriculture, male animals are often castrated to modify their behavior and to produce desirable qualities in the meat. What would you predict about hormone levels in castrated male animals?
A. Testosterone is high; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are low.
B. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high.
C. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are low.
D. Testosterone is high; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high.
B. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high.
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Honey bees use movement in specific patterns (waggle) that convey information about the location of a food source. Which of the following does not accurately describe the waggle dance?
A. The waggle is "danced" by the queen bee. B. Foragers waggle back and forth while moving forward. Then they circle back, repeat the waggle and circle back the other way. C. Distance to the food source is conveyed by a waggle up the middle of the bee's circle. D. If the food source is far away, the bee spends more time waggling up the middle of its circle. E. Finding the food source that is at a 45 degree angle requires that the dancer's "line" be 45? to the left of vertical.
Defects in bone marrow stem cells result in a condition known as
A. SCID. B. AIDS. C. Di George's syndrome. D. Chediak-Higashi disease.
The organizational phases of development are regulated by
A. transcription factors B. morphogens C. segmentation genes D. morphogens and transcription factors only E. morphogens, transcription factors, and segmentation genes
In animal skeletal muscles, white muscle fibers
a. have an abundance of myoglobin. b. make ATP by lactate fermentation. c. produce ethanol. d. are good for sustained activities. e. are not found in chickens