One disadvantage in excreting urea rather than uric acid is that:a
urea is more toxic than uric acid.
b. urea is less toxic than uric acid.
c. urea is excreted by respiratory structures.
d. urea requires more water for excretion.
e. urea is produced from ammonia, not nucleic acids.
D
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Which of the following statements about proteoglycans is TRUE?
A. Proteoglycans are composed of collagen. B. Proteoglycans are composed of polysaccharides called glycosaminoglycans. C. Proteoglycans provide resistance to compression. D. Proteoglycans are both composed of collagen and provide resistance to compression. E. Proteoglycans are both composed of polysaccharides called glycosaminoglycans and provide resistance to compression.
Which portion of a phospholipid is hydrophilic?
a. fatty acid tails b. glycerol heads c. The entire phospholipid is hydrophilic. d. None of the phospholipid is hydrophilic.
Why does the sarcomere get narrower during muscle contraction?
A. The myosin fiber shrinks. B. The myosin and actin fibers overlap more. C. The edges of the muscle push the cells closer together. D. The actin fiber shrinks. E. The sarcoplasmic reticulum empties.
Cranial nerves are connected directly to the brain.
Answer the following statement true (T) or false (F)