To Become Bound to Hemoglobin for Transport in Mammals, Atmospheric

question 42

Multiple Choice

To become bound to hemoglobin for transport in mammals, atmospheric molecules of oxygen must cross ________.

• A) one membrane-that of the lining in the lungs-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood
• B) two membranes-in and out of the cell lining the lung-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood
• C) four membranes-in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillary-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood
• D) five membranes-in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillary, and into the red blood cell-to bind with hemoglobin

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Definitions:

Uracil

A nitrogenous base found in RNA that pairs with adenine during RNA synthesis.

Nucleotide Bases

The building blocks of DNA and RNA molecules, consisting of adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U, in RNA).

RNA

Ribonucleic acid, a molecule essential for various biological roles, including coding, decoding, regulation, and expression of genes.

Translation

Translation is a biological process by which messenger RNA is decoded by a ribosome to produce a specific amino acid chain, or polypeptide, that will fold into an active protein.