What moves the food from your mouth to your stomach when you swallow?
A. Pressure difference between zones of the esophagus
B. Gravity
C. Enzymes excreted by the salivary glands
D. Peristaltic muscle contractions
Answer: D
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The movement of carbon from CO2 in the atmosphere to HCO3 - (a byproduct of chemical weathering) on rocks to CaCO3 in coral skeletons and finally CaCO3 in limestone are all steps in the _____________
A. short-term carbon cycle B. nitrogen cycle C. sulfur cycle D. long-term carbon cycle
Accuracy in the translation of mRNA into the primary structure of a polypeptide depends on specificity in the _____
A) binding of ribosomes to mRNA B) binding of the anticodon to small subunit of the ribosome C) attachment of amino acids to rRNAs D) binding of the anticodon to the codon and the attachment of amino acids to tRNAs
Oxygen would interfere with organic molecules by
A. increasing the weight (mass) of the molecules. B. combining with the organic molecules and destroying them. C. stopping all chemical reactions. D. increasing the thickness of the atmosphere.
Which of the following families of cytokines play a central role in the inflammatory response by stimulating cell migration and attracting phagocytic cells and lymphocytes?
A) Chemokines B) Hematopoietins C) Interleukins D) Tumor necrosis factor (TNF)