________ breaks frozen specimens along lines of greatest weakness, often down the middle of lipid bilayer membranes so that they may be observed by transmission electron microscopy.
Fill in the blank(s) with the appropriate word(s).
Freeze-etching
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What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
A) anabolic pathways B) catabolic pathways C) fermentation pathways D) thermodynamic pathways E) bioenergetic pathways
Sponges are atypical animals because they
(a) reproduce sexually. (b) are heterotrophic. (c) lack definite tissues. (d) are multicellular.
Which statement best describes why oxygen is unloaded in tissue that is highly active?
A) As temperature increases due to increased metabolism, the affinity of hemoglobin for oxygen is decreased. B) As temperature increases, the carbamino effect causes hemoglobin to release oxygen. C) As temperature increases, the Bohr effect causes hemoglobin to release oxygen. D) Highly active tissues produce more carbon dioxide, which competes for the heme groups in hemoglobin, thereby displacing oxygen. E) As temperature increases, the affinity for oxygen to hemoglobin increases, allowing more oxygen to be carried to the tissues.
Which one of the following STD's is NOT caused by a virus