To make information travel faster through your body, your neurons ________.
a. are very large
b. are wrapped with myelin
c. are made of gray matter
d. all those
Answer: b. are wrapped with myelin
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Answer the following statements true (T) or false (F)
1. In the organismic model, communities are superorganisms. 2. A forest community consists of not only the trees and shrubs, but also the animals and microorganisms. 3. If one species in a community is very common this will increase measures species diversity. 4. The time hypothesis suggests communities diversify with age. 5. South Texas has the highest bird species richness in the continental United States.
How did the researchers first know that Marilyn the chimp may be infected with HIV?
a. Because she had HIV RNA in her blood b. Because she had HIV DNA in her tissues c. Because she had been used in HIV research d. Because she had raised antibodies against HIV e. Because she had symptoms of HIV infection, or AIDS
Which of these factors would be involved in maintaining a constant gene frequency in a population?
A. dominant alleles B. lack of migration C. high rate of mutation D. a caste system that determines whom one can marry
On chromosomes within an individual, there are ________ alleles for a given gene found on ________ chromosomes.
a. two; homologous b. four; maternal c. four; paternal d. two; Y