Chemical signals released into the environment are called

A) telemones.
B) pheromones.
C) apomones.
D) hormones.
E) spermatophores.


B

Biology & Microbiology

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Profuse watery diarrhea (i.e., "rice water stools"), leading to dramatic fluid loss, severe dehydration, and hypotension that frequently leads to death, is the hallmark of which toxin activ-ity?

a. Cholera toxin (CT) b. Enteric endotoxin c. Shiga toxin d. Toxin A

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Why must sea otters consume 25% of their body weight in food every day?

What will be an ideal response?

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In what way(s) can mRNAs be processed?

A. By adding caps and tails to the ends of the mRNAs B. By splicing the exons (the coding regions) of the mRNAs in different ways C. By removing the introns (the noncoding regions) of the mRNAs D. All of the above are ways in which mRNAs can be processed

Biology & Microbiology

Which of the following statements is false?

a. Cell migration during embryonic development is an example of chemotaxis. b. Embryonic neurons follow adhesive cells as they migrate. c. Cells continue migrating throughout the entire embryonic process. d. Morphogenesis depends upon local growth. e. Controlled cell death can be involved in morphogenesis.

Biology & Microbiology