Which of the following is NOT an essential amino acid?
A. Leucine
B. Lysine
C. Valine
D. Proline
Answer: D
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One type of skin cancer, which often results in a potentially fatal metastasis, arises in the pigment-producing cells called ________.
Fill in the blank(s) with the appropriate word(s).
Which blood vessels are direct branches of the left coronary artery?
a. circumflex and marginal arteries b. anterior and posterior interventricular arteries c. anterior interventricular and marginal arteries d. anterior interventricular and circumflex arteries e. posterior interventricular and marginal arteries
The spaces found within the concentric lamellae are called ________, and they contain ________
A) osteons; stem cells B) lacunae; osteocytes C) central canals; osteocytes D) lacunae; osteoclasts E) canaliculi; osteoblasts
The life stage at which the reproductive organs become capable ________.
A. is puberty B. is birth C. varies between males and females D. is menopause