On which portion of the hemoglobin molecule does carbon dioxide bind?
a. protein chain
b. cholesterol side chains
c. iron in the cytoplasm
d. heme group
e. nuclear side chains
ANSWER: a
You might also like to view...
How did the evolution of the jaw contribute to diversification of early vertebrate lineages?
A) It allowed for smaller body size. B) It was the first stage in the development of a bony skull. C) It paved the way for the evolution of the pharyngeal jaw. D) It made additional food sources available. E) It increased the surface area for respiration and feeding.
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for 2 generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band. B. one light band. C. one half-heavy (intermediate to heavy and light) band. D. one heavy and one half-heavy band. E. one light and one half-heavy band.
Why are some molecules electrically neutral, whereas others display polarity?
a. Molecules that have lost an electron will have a positive charge. b. All molecules start off electrically charged, but this charge weakens over time. c. Relative differences in electronegativity between elements in a molecule result in negatively charged electrons spending more time near some elements than others, resulting in asymmetrical charge distributions. d. Radioisotopes eject positrons as they decay, becoming more electrically negative over time.
where the fetus grows
What will be an ideal response?