DNA is present in all of the following human cell types except ________
A) skin cells
B) erythrocytes (mature red blood cells)
C) leukocytes (white blood cells)
D) hair
E) buccal (cheek) cells
B
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In the mammalian digestive system, what is the primary site of nutrient absorption?
A. pharynx B. stomach C. small intestine D. large intestine E. pancreas
What is the main factor that drives ozone
formation?
a. cloud cover b. rainfall c. time of day d. sunlight e. season
Which of the following is NOT a factor that
contributed to the production of coal from the remains of Carboniferous vegetation? a. heat b. pressure c. drying d. decomposition e. compaction
Which of the following characteristics tends to limit bryophytes and seedless vascular plants to habitats that are relatively moist?
A) absence of cuticle B) presence of flagellated sperm C) presence of free-living, independent zygotes and early embryos D) absence of lignified vascular tissues