DNA analysis reveals that two species of birds appear to have evolved from a common ancestor. These two species belong to the same
A) nest group.
B) species.
C) gene pool.
D) clade.
E) breeding group.
D
You might also like to view...
A population of mosquitoes is exposed to the pesticide DDT for several generations. At the end of that time, most individuals in the population are resistant to DDT. The most likely reason is that:
A. DDT caused the mutations that lead to resistance. B. some individuals in the original population had the mutations that lead to resistance. C. by chance, new mutations that lead to DDT resistance arose after DDT was used. D. somatic mutations in the original population were passed on to subsequent generations. E. random mutations in each generation made mosquitoes resistant to DDT.
What features are associated with the leaf epidermis? Check all that apply.
_____ Guard cells. _____ Trichomes. _____ Cuticular wax. _____ Pores. _____ Tracheids.
Which of the following is not a possible destination for vesicles leaving the Golgi apparatus?
a. The plasma membrane b. The exterior of the cell c. Lysosomes d. Mitochondria
Why are waves of calcium that enter cells and are propagated through the cytoplasmic compartment, as happens within the first minute or so after fertilization, generally transient?
a) The ions are changed to calcium salts as soon as they enter the cell. b) The Ca2+ ions are rapidly pumped out of the cytosol and back into the ER and/or the extracellular space. c) The ions are destroyed as soon as they enter the cell. d) Option D: The Ca2+ ions are rapidly pumped out of the cytosol and back into the nucleus.