Koopmans (1981) transplanted an extra stomach and length of intestine into rats and then joined the major arteries and veins of the implants to the recipients' circulatory systems. He found that food injected into the transplanted stomach and kept there by a noose around the pyloric sphincter:
(a) decreased eating in proportion to both its caloric content and volume
(b) increased eating in proportion to both its caloric content and volume
(c) did not affect eating
(d) produced a conditioned taste aversion for the injected food
(a) decreased eating in proportion to both its caloric content and volume
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The primary function of DNA ligase is to
a. cut the two strands of DNA molecule prior to replication. b. attach free nucleotides to a growing chain. c. remove bases that might have been inserted incorrectly. d. seal any tiny gaps in the new DNA. e. fragment old DNA that is no longer of use to the cell.
Which of the following statements about allopolyploidy is false?
a. It can result in a new, reproductively isolated species in just one generation. b. Many flowering plant species are allopolyploids. c. It accounts for a large portion of the remarkable species diversity observed on Earth today. d. The hybrid may have a combination of traits conferring greater fitness than the parent species. e. The hybrid may assume a new role in the environment and so coexist with the parent species.
The hypothesis that explains the origin of eukaryotic cells as the result of two or more simpler cells developing a relationship with one another is called:
A) symbiosis B) evolution theory C) endosymbiont theory D) panspermia
For given species or groups of species, some taxonomists and evolutionary biologists disagree on which common ancestry and evolutionary relationships may exist. They may hypothesize different common ancestors (nodes) or descendants (clades). Still, where fossil, or phenotype, or DNA sequence, or other factors make decisions difficult in preparing the cladogram, researchers commonly ensure their interpretation is the most
What will be an ideal response?