What reproductive characteristics allowed the formation of an egg with a leathery shell?
What will be an ideal response?
In order to form such eggs, fertilization must take place before the leathery case of reptilian and avian eggs is laid down. The evolution of copulatory organs that allowed internal fertilization allowed the development of such an egg.
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Which of the following is characteristic of animals?
(a) heterotrophy. (b) autotrophy. (c) photosynthesis. (d) both b and c.
Figure 5-17 shows the approximate Km for the hydrolysis of ATP by helicase PcrA to be:
A. 3 µM. B. 5 µM. C. 10 µM. D. 15 µM. E. 20 µM.
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What will be an ideal response?
The stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells. Which type of gating mechanism do these cells use?
(a) voltage-gated (b) extracellular ligand-gated (c) intracellular ligand-gated (d) stress-gated