Which of the following statements is false?
(a) Proteoglycans can act as filters to regulate which molecules pass through the extracellular medium.
(b) The negative charge associated with proteoglycans attracts cations, which cause water to be sucked into the extracellular matrix.
(c) Proteoglycans are a major component of compact connective tissues but are relatively unimportant in watery tissues such as the jellylike substance in the interior of the eye.
(d) Glycosaminoglycans are components of proteoglycan.
(c) Proteoglycans are more important in the interior of the eye, where collagen is very scarce, than in compact connective tissues such as bone and tendon, whose structure is dominated by collagen.
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Which of the following events do not occur in non-stop mRNA decay?
A. A string of lysine residues are added at the C-terminus of the polypeptide. B. The stalled ribosome recruits Ski7 protein. C. Ski7 protein degrades the defective protein by recognizing the C-terminal poly(Lys) tag. D. An exosome ribonuclease degrades the mRNA.
Acid rain caused by human activities, primarily the burning of fossil fuels, contributes to which cycle?
a. nitrogen cycle b. phosphorus cycle c. sulfur cycle d. carbon cycle
GTP-binding proteins contain 4 subunits.
a. true b. false
The upper portion of the intestine through which most of the glucose and amino acids are absorbed into the bloodstream
What will be an ideal response?