A gene typically has many alleles because
A. a protein sequence can vary in many ways.
B. humans have many traits.
C. a chromosome has many genes.
D. a DNA sequence can vary in many ways.
Answer: D
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The endocrine gland not located in the skull is the:
a. pineal gland b. thymus gland c. pituitary gland d. hypothalamus
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Because the amount of atmospheric air that reaches the alveoli and is actually available for exchange with blood is more important than the total amount breathed in and out, alveolar ventilation is more important than pulmonary ventilation
a. True b. False Indicate whether the statement is true or false
The three branches off of the aorta that supply blood to the upper limbs and head are the ________.
A. brachiocephalic trunk, right subclavian artery, and left common carotid artery B. left common carotid artery, left subclavian artery, and brachiocephalic trunk C. brachiocephalic trunk, right subclavian artery, and left subclavian artery D. right common carotid artery, right subclavian artery, and brachiocephalic trunk