Although bees carry pollen from tulip flowers to the blossoms on cherry trees, hybrid seeds are not produced because of
A) gametic isolation.
B) temporal isolation.
C) ecological isolation.
D) mechanical isolation.
E) All of these
A
You might also like to view...
Horses are large herbivores that lack the four-chambered stomach of foregut fermenters like cows. You would therefore expect the equine (horse) gut to have an enlarged _____ relative to omnivores of similar size
A. stomach B. small intestine C. liver D. pancreas E. cecum
A nonprotein component of an enzyme that is usually a metal ion or small organic molecule is called a(n) ________
Fill in the blank with correct word.
What kind of molecular information is commonly used to study phylogeny among ORGANISMS that diverged from a common ancestor relatively long ago?
A. The mitochondrial genome because it easily incurs neutral mutations. B. Whole genomes because they are easy to obtain. C. Small ribosomal subunit (SSU) RNA because it is found in the genomes of all living organisms. D. Segments of cellular membrane proteins because the proteins, coded by DNA, are found in all living organisms. E. DNA sequences within introns because their sequences change rapidly over evolutionary time.
Oxidation and reduction states are relatively easy to determine for metal ions, because there is a measurable net charge. In the case of carbon compounds, oxidation and reduction depend on the nature of polar covalent bonds
Which of the following is the best way to describe these types of bond? (a) hydrogen bonds in a nonpolar solution (b) covalent bonds in an aqueous solution (c) unequal sharing of electrons across a covalent bond (d) equal sharing of electrons across a covalent bond