Chloroplasts are thought to have evolved from:
A. algae.
B. autotrophic protists.
C. mitochondria.
D. cyanobacteria.
E. proteobacteria.
D
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nucleoid
A. a feature of all cells B. found in prokaryotic cells only C. found in eukaryotic cells only D. found in plant cells only E. found in animal cells only
Why do women experience the symptoms of osteoporosis more acutely than men?
A) Women have less bone mass and produce less estrogen later in life; these factors accelerate calcium loss. B) Women have less muscle mass and don't exercise as much. C) Men don't produce estrogen, so they don't rely on it as much as women do. D) Men take in more calcium in their diet, so they can't get osteoporosis.
Glands that lack ducts and use the bloodstream to transport their products are called ________ glands
Fill in the blank(s) with correct word
In humans, most nutrient molecules are absorbed by the __________.
a. stomach b. liver c. small intestine d. large intestine e. pancreas