The long tube that carries food to the stomach is called the:
A) ascending colon
B) descending colon
C) jejunum
D) esophagus
D
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Match each level of protein structure with its description.
1. applies to proteins containing more than one peptide chain 2. the sequence and number of amino acids in the chain 3. the three-dimensional shape of an amino acid chain; can be fibrous or globular 4. the spatial arrangement of amino acids; can be a helix or a pleated sheet A. primary B. secondary C. tertiary D. quaternary
The backbone of a DNA molecule is a chain of ________.
alternating deoxyribose sugar and phosphate alternating phosphate and nitrogen alternating nitrogenous bases alternating deoxyribose and ribose sugars
The process of physically and chemically breaking food particles down is referred to as ________
A) digestion B) defecation C) ingestion D) absorption
In smooth muscle, cross-bridging occurs due to
A. calcium binding to troponin. B. calcium binding to calmodulin. C. myosin kinase adding a phosphate to myosin heads. D. both calcium binding to troponin and calmodulin. E. both calcium binding to calmodulin and myosin kinase adding a phosphate to myosin heads.