Which of items below represents an example of exaptation?
a. the use of feathers for flight
b. the development of lungs
c. antibacterial resistance
d. fragrances in flowers
e. coloration in peppered moths
What will be an ideal response?
Answer: a
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Protein kinase is an enzyme that _____
A) functions as a second messenger molecule B) serves as a receptor for various signal molecules C) activates or inactivates other proteins by adding a phosphate group to them D) produces second messenger molecules
Compare and contrast the structure, life cycle, and host cell type of naked and enveloped viruses
What will be an ideal response?
A leaf without a(n) blade is said to be sessile. Indicate whether the statement is true or false
For many years scientists believed that almost all animal lineages burst into being during the Cambrian era (just after the end of the Precambrian super eon)
However, there have been many recent findings of animal-like fossils and "trace fossils" (fossils of an animal-like organisms movement) from the late Precambrian. Which of the following best explains why it took so long to realize there was animal-like life in the Precambrian? A) Animals from the late Precambrian had soft bodies. B) There were many hard-shelled animals in the Cambrian. C) The global climate was such that there was poor fossilization in the Precambrian. D) There were very few animals during this period.