Which condition is NOT associated with chromosome 21?
a. sickle-cell anemia
b. Down syndrome
c. ALS
d. epilepsy
e. schizophrenia
ANSWER: a
Biology & Microbiology
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____ allow(s) land animals to exchange gases with air across a moist surface
a. Gills b. Moist skin c. A digestive system d. Lungs e. Nasal passages
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WHAT DOES NATURAL SELECTION RESULT IN
What will be an ideal response?
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When calculating the gross national product, economists consider whether an activity is environmentally harmful.
Answer the following statement true (T) or false (F)
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Normal white blood cells (called B cells) and cancerous B cells that cause leukemia both carry a unique surface protein
called CD-19. a. True b. False
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