Research has shown that certain body cells, known as stem cells, can develop into a variety of specialized cells. Various factors can cause stem cells to develop into different types of mature cells. These different types of mature cells result from
A. different antibodies and mitotic cell division
B. identical genetic codes and meiotic cell division
C. different environments of the cells and the functioning of different parts of the genetic code
D. similar steps in the development of the cells and a reduction in the number of chromosomes in each cell
Answer: C. different environments of the cells and the functioning of different parts of the genetic code
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Check all that apply: Members of the same biological species can
_____ have several isolated gene pools. _____ differ from other species in one or more characteristics. _____ generate fertile offspring with the members of a different species. _____ interbreed freely with each other.
Earth has a constant tilt of _____ on its axis from its plane of orbit.
A. 5.5° B. 9° C. 12.5° D. 23.5° E. 30°
If many human genes differ in about 10% of their bases from another species' same genes and substitutions occur at an estimated rate of 2% per one million years then
A. approximately 5 million years have passed since the two species diverged. B. approximately 3 million years have passed since the two species diverged. C. approximately 10 million years have passed since the two species diverged. D. approximately 20 million years have passed since the two species diverged. E. approximately 200,000 years have passed since the two species diverged.
Which of the following statements is not true concerning the central nervous system?
A. The central nervous system is made up of the spinal cord and the brain. B. Both the brain and spinal cord are protected by meninges. C. The spaces around the brain and spinal cord are filled with fluid. D. The brain and spinal cord contain only white matter: myelinated axons that run together in bundles. E. Both the brain and spinal cord are protected by bone.