What is the fate of metabolites during respiration?
a. They are oxidized completely to carbon dioxide and water.
b. They are reduced to from NADH and FADH2.
c. They are oxidized completely to form pyruvic acid.
d. They are rearranged to form GTP.
Answer: a. They are oxidized completely to carbon dioxide and water.
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You have recently identified a molecule that you believe to be a ligand associated with a signal transduction mechanism. All you know about this ligand is that chemically it is hydrophilic. As a result, you expect it to interact with its receptor
A) at the outer cell surface. B) within the cytoplasm of the cell. C) within the nucleus of the cell. D) on the cytoplasmic side of the plasma membrane. E) all of the above
During forceful exhalation, the ____ muscles contract
a. diaphragm and abdominal b. external intercostal c. internal intercostal d. diaphragm and external intercostal e. diaphragm and internal intercostal
Which of the following characteristics indicates that Tiktaalik was an intermediate form between fish and amphibian?
a. The fossil reveals the presence of true lungs, with no gills present. b. Evidence suggests that the eyes were forward facing, similar to a terrestrial predator. c. The attachment of the fin bones to the shoulder suggest that they might be weight bearing. d. The DNA evidence shows that Tiktaalikâs enzymes were adapted for terrestrial habitats.
Flagellated protozoans possess a ____, layer of elastic proteins just beneath the plasma membrane
Flagellated protozoans possess a ____, layer of elastic proteins just beneath the plasma membrane.
a. pellicle b. cilium c. capsule d. pilus e. flagellum