How did Hans Krebs discover the citric acid cycle?
What will be an ideal response?
He demonstrated that the four carbon organic acids succinate, fumarate, malate, and oxaloacetate
stimulated the consumption of oxygen in pigeon breast muscle tissue. He also showed that the
oxidation of pyruvate is stimulated by citrate, isocitrate and á-ketoglutarate.
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Which one of the following animals would most likely be defined as a keystone species?
A) sea otter B) housefly C) fathead minnow D) nauplii (a species of zooplankton)
Examine the phylogenetic tree depicted in Figure 26.17 as you address the following questions. The ability to produce methane is constrained to Archaea that optimally grow at temperatures ranging from 20-60 °C
A. true B. false
People who exercise regularly have less mitochondria than couch potatoes.
a. true b. false
Why is the evolution of secondary growth important for plants?
What will be an ideal response?