Some enzymatic receptors and most G protein-coupled receptors transmit the signal into the cytoplasm by utilizing other substances within the cytoplasm that are referred to as
A. first messengers.
B. intracellular receptors.
C. second messengers.
D. genes.
Answer: C
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All of the following statements accurately describe eutrophication EXCEPT which one?
A) Eutrophication may be accelerated by agricultural runoff containing fertilizers. B) Eutrophication can be part of a natural process that converts freshwater to marsh to dry land. C) Eutrophication is beneficial and enhances the diversity of life-forms in a body of water. D) Eutrophication accelerates plant and algal growth at the expense of animal diversity. E) Sewage and other organic nutrient pollutants can enhance eutrophication.
Alloploidy provides a mechanism for slow speciation
________ Indicate whether the statement is true or false.
Which of these statements is NOT correct about flatworms?
A. Flatworms are deuterostomes. B. The embryos of flatworms are triploblastic. C. Flatworms have a sac body plan with an incomplete gut. D. Flatworms are in phylum Platyhelminthes. E. Flatworms are free-living or parasitic.
Suppose that crossing-over during meiosis occurs within a region where one of the homologous chromosomes has an inversion with respect to the other homolog. Which chromosomal alterations would you expect to find in the gametes produced by this organism?
a. balanced translocations b. translocations c. both duplications and deletions