Damage to the mesoderm during embryological development would affect the formation of which of the following structures?
A. Thyroid
B. Urinary bladder
C. Teeth
D. Heart
E. Brain
Answer: D
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The immunocompetence-handicap hypothesis
A) Lends support to the sexual selection hypothesis, which states that males with the most elaborate displays provide an honest signal of good health. B) Suggests that males with superior immunocompetance are the ones with the least elaborate displays but the longest lifespan. C) Suggests that the immune system of males competes for resources with sexually selected elaborate displays, and those males with superior immunocompetence can withstand the costs of developing elaborate displays. D) A and C
Answer the following statements true (T) or false (F)
1. Cilia are hairlike structures on the free or exposed sides of some cells. 2. Endoplasmic reticulum are the “digestive bags” of the cells. 3. The mitochondria is considered the “power plant” of the cell. 4. Centrioles assist in cell division. 5. The Golgi apparatus is called the “protein factory.”
Which condition results from failure of vertebral laminae to fuse?
A. Kyphosis B. Lordosis C. Spina bifida D. Scoliosis E. Herniated disk
Which structure anchors the thecal sac and conus medullaris to the coccyx?
A. Denticulate ligaments B. Pia mater C. Filum terminale D. Cauda equina