Based on DNA evidence, fossil evidence, homology, and vestigial structures, what do humans and chimpanzees share?
What will be an ideal response?
a common ancestor
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If the hypothesis stating viruses evolved prior to living organisms on Earth is true, the first type of viruses in the world were likely
A) bacteriophage. B) DNA viruses. C) retroviruses. D) RNA viruses.
Within a nucleoid, the supercoiled DNA loops are held together by:
A. proteins. B. topoisomerase II. C. homologous chromosomes. D. nucleosomes. E. nucleiods.
Minick Rosing's analysis of microscopic globules of carbon found in rocks 3.7 billion years old showed that they were somewhat higher in 12C as opposed to 13C. This is significant because ________
A) 13C radiometrically decays into 12C, which lets us calculate the age of these rocks B) life could not have arisen in an environment with excessive 13C C) these carbon globules contain visible remains of cell walls and nuclei D) living things that fix carbon preferentially incorporate 12C over 13C E) meteorites must have brought 13C to the early Earth
An allele on the X chromosome is responsible for the recessive trait of red-green color blindness in humans. The daughter of a woman who is color-blind has normal vision and marries a man who is color-blind. This couple has a son, what is the probability that the son will be color-blind?
(A) 0 (B) 1/4 (C) 1/2 (D) 3/4