Which process is directly responsible for the synthesis of adenosine triphosphate molecules?
a. digestion
b. excretion
c. respiration
d. circulation
Ans: c. respiration
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Which of the following represents a double-blind study?
A. The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers. B. The test group knows whether they are receiving a placebo or the actual treatment, but the researchers do not know until all the data are collected. C. The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do. D. Neither the test group nor the researchers know whether the test group is receiving a placebo or the actual treatment until all the data are collected.
A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as
A. osmosis. B. diffusion. C. facilitated transport. D. active transport. E. exocytosis.
Birds utilize countercurrent mechanisms to optimize diffusion of O2 across their respiratory surfaces
Indicate whether the statement is true or false.
A phylogenetic tree is shown in part (b) of the image above. Phylogenetic trees visually represent hypotheses of the evolutionary relationships and ancestry of species or species groups. In this case, Najash is placed in proposed context with other snake species, representing different groups of snakes around the world. What can you conclude about the evolution of sea snakes and the Najash species?
A. The phylogenetic tree shows that Najash, lower in the diagram, had the fossil marine snakes in its ancestry. B. Najash diverged separately and earlier than the three fossil marine snakes, indicating only a weak evolutionary relationship. C. All of these answer options are correct, except that Najash did not have fossil marine snakes in its ancestry. D. Najash is proposed as a separate group from other snakes, while the three fossil marine snakes are more similar to living snakes. E. Both Najash and the three fossil marine snakes have ancestry traced back to an original snake species.