Chemical signals such as __________ have roles in social communication.
Fill in the blank(s) with the appropriate word(s).
pheromones
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Which of the following biochemical reactions identifies an organism associated with blood, bone, and joint infections in young children?
a. Positive catalase, positive nitrate reduc-tion, and positive indole b. Negative catalase, positive nitrate reduc-tion, and positive indole c. Negative catalase, negative nitrate reduc-tion, and positive indole d. Negative catalase, negative nitrate reduc-tion, and negative indole
Okazaki fragments are small pieces of
A) RNA. B) protein. C) DNA. D) enzymes.
The accompanying figure shows what happens in insect populations when crops are sprayed with insecticides. This is an example of ___
A. founder effect B. genetic drift C. gene flow D. natural selection
Which system defends against infections and cancer?
a. endocrine b. circulatory c. respiratory d. lymphatic e. urinary