Plants arose from green algae. Why are green algae and plants not classified under the same kingdom?
What will be an ideal response?
Plants are multicellular, by definition. Most green algae are unicellular, colonial forms.
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The ____ are the initial branches of the trachea that lead into each lung
a. bronchioles b. alveoli c. pleura
d. bronchi e. larynx
How many total CO 2 are produced during the Krebs cycle?
a. 2 b. 3 c. 4 d. 6
Compact bone
What will be an ideal response?
A scientist studying the oxygen concentration in sealed chambers containing cultured plant cells finds that when the chambers are illuminated, the concentration of oxygen increases. However, when the chambers are kept in the dark, the concentration of oxygen decreases. Why does the oxygen concentration decrease when the chamber is kept in the dark?
(A) Plant cell mitochondria consume oxygen by aerobic respiration. (B) Plant cell chloroplasts run the photosynthetic pathways backward to consume oxygen. (C) Plant cell chloroplasts switch their structure and function and become mitochondria. (D) The chambers must not be properly sealed, so that oxygen is leaking out.