A water-vascular system that operates the tube feet is characteristic of the ____
a. arthropods
b. annelids
c. chordates
d. mollusks
e. echinoderms
ANSWER: e
Biology & Microbiology
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In which year does it appear that the climate was most conducive to growth?
a. 2009 b. 2010 c. 2011 d. 2012
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Which structure reduces friction around tendons?
a. ligaments b. bursae c. origins d. insertions e. myofibrils
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When substrate-level phosphorylation occurs, it means that
A. ATP is converted into ADP plus a phosphate group. B. ADP is converted into ATP by the addition of a phosphate group. C. NADH is converted into NAD+ plus a proton. D. NAD+ is converted into NADH.
Biology & Microbiology
Which of the following bonds explains the cohesion of water molecules in the cohesion-tension mechanism?
A) Disulfide B) Peptide C) Hydrogen D) Ionic E) Covalent
Biology & Microbiology