The mutual attraction of opposite charges holds atoms together as molecules in a(n) _____ bond
a. ionic c. polar covalent
b. hydrogen d. nonpolar covalent
A
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In what way does hemoglobin act as a buffer against changes in blood pH?
A) Subsequent binding of oxygen is drastically reduced after the first one is bound. B) Hemoglobin binds some of the excess protons released by carbonic acid. C) Hemoglobin produces protons or hydroxide ions as needed to alter the blood pH. D) Hemoglobin removes excess protons from the red blood cells so that they can be excreted through the kidneys.
Each end of a long bone is called ____
a. the diaphysis b. the epiphysis c. the shaft d. compact bone e. canaliculi
In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food. This would lead to ________ in the ancestral giraffe population.
A. disruptive selection B. sexual selection C. genetic drift D. directional selection E. stabilizing selection
DNA is a ____ stranded molecule.
A. double B. single C. triple