All the bones below belong to the axial skeleton, except the ________, which belongs to the appendicular skeleton.
A. mandible
B. frontal bone
C. thoracic vertebra
D. stapes
E. scapula
Answer: E
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The apical ectodermal ridge
A. forms at the proximal end of each limb bud. B. plays a role in differentiation and elongation of the limb. C. ossifies prior to formation of the hand and foot plates. D. must undergo apoptosis before the limb can develop. E. secretes mesoderm for muscle formation.
More than one sperm is prevented from fertilizing an egg by all of the following mechanisms except:
A. Opening sodium channels in the plasma membrane causes a change in the electrical charge of the membrane. B. Secretion of material from cortical granules pushes sperm away from the already fertilized egg. C. A slow block to polyspermy occurs. D. Meiosis II is completed by the egg. E. A fast block to polyspermy occurs.
Which of the following structures is not part of the inner ear?
What will be an ideal response?
Which of the following are produced through meiosis?
A) Bone Cells B) Sex Cells C) Blood Cells D) Epithelial cells