How do the protein fibers in the matrix ground substance compare between loose and fibrous connective tissues?
A) In loose connective tissues, the protein fibers are loosely woven, but in fibrous connective tissues, the fibers are densely packed.
B) In fibrous connective tissues, the protein fibers are loosely woven, but in loose connective tissues, the fibers are densely packed.
C) The protein fibers are dark red in fibrous connective tissue but are white in loose connective tissues.
D) The protein fibers are white in fibrous connective tissue but are dark red in loose connective tissues.
A
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A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage
a. fermentation b. photosynthesis c. sexual reproduction d. aerobic respiration e. anaerobic respiration
Which of the following is not a fundamental property of carbon?
A) Carbon-containing molecules are diverse. B) Carbon-containing molecules may form stereoisomers. C) Carbon-containing molecules are stable. D) Carbon has a valence of 4. E) Carbon atoms are most likely to form ionic bonds with one another.
nucleotides.
amino acids. RNA molecules only. DNA molecules only. RNA and DNA molecules. nucleotides.
Most aquatic animals excrete ammonia, whereas land animals excrete urea or uric acid. What is the most likely explanation for this difference?
a. They have different diets. b. Land animals can get the energy needed to make urea or uric acid. c. Ammonia is very toxic, and it takes a lot of water to dilute it. d. Land animals cannot afford the energy needed to make ammonia. e. Fish need to get rid of ammonia, but land animals need it to live.