True or false? Isotopes differ in the number of electrons
True
False
False
Explanation:
Isotopes differ in the number of neutrons. Isotopes of a same atom have similar properties because their number of protons (and electrons) are the same. Isotopes may have more or fewer neutrons than the original atom.
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Infectious mononucleosis is caused by the Epstein-Barr virus, and patients often exhibit a fever, sore throat, swollen glands, and fatigue for several weeks. In some patients, the virus can reactivate later and cause physical symptoms once again
This is likely because A. they were misdiagnosed the first time, and only really were infected by the virus the second time they became sick. B. the virus was latent in these patients, and then switched to the active form and began making new virus particles C. the patients had the virus initially, and they became sick again at the time the virus became latent. D. the Epstein-Barr virus is an emerging virus so we do not know much about its infectious life cycle.
When a child is born, mitosis ceases to function.
Answer the following statement true (T) or false (F)
The McDonald-Kreitman test is an important tool in molecular evolutionary analysis. What is this test, and what kinds of insights can it provide?
What will be an ideal response?
The oldest fossil organisms presently known have been dated at approximately how many years old?
A) more than 4.5 billion B) less than 1.7 billion C) 4.5 billion D) 1.7 billion E) 3.4 billion