Which statement provides the best evidence that there is a common genetic code that demonstrates the unity of life?
A) Bees, birds, and bats all have wings and fly.
B) Many insects can pollinate only a particular species of plant due to many generations of evolutionary adaptation.
C) Through genetic engineering, a gene from a firefly can be inserted into a bacterium to make it glow.
Answer: C
You might also like to view...
Why would the Sabin oral polio vaccine need to be eliminated as we get closer and closer to eradication of the polio virus?
A. Since it is a live, attenuated viral vaccine, there's always the chance it could revert back into a pathogenic state by mutation. This would introduce new strains still capable of causing the illness into human populations, thwarting elimination. B. The Sabin vaccine is cheaper than the Salk (killed virus) vaccine, but it isn't as effective at producing a protective response. We'll need to shift to the more effective Salk vaccine worldwide eventually to complete the eradication process. C. The Salk vaccine is far cheaper than the Sabin vaccine. To effectively eradicate polio, we'll need to shift all of our resources into the cheapest and easiest to deliver vaccine possible. That is the Salk vaccine. D. The Sabin vaccine can only be administered to human beings. We need to vaccinate bird populations as well to effectively control the spread of polio. Birds are a natural reservoir for the virus.
Most males born with an extra Y chromosome
A) die shortly before or after birth. B) are violent and anti-social. C) are tall but are otherwise normal. D) are phenotypically female.
Which of the following pairs of traits are homologous?
a. butterfly wings and bat wings b. the surface areas of bird and bat wings c. the bones of bird and bat wings d. butterfly wings and bird wings e. bird wings and bat wings
In which year was the sequencing of the
human genome completed?
a. 2003 b. 2001 c. 1999 d. 1997 e. 1995