The bacteriophages used in Alfred Hershey's and Martha Chase's experiments showed that:a
DNA was injected into bacteria.
b. DNA and protein were injected into bacteria.
c. DNA remained on the outer coat of bacteria.
d. proteins were injected into bacteria.
e. proteins were responsible for the production of new viruses within the bacteria.
A
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What can be assumed from these results?
In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate. A. The newly synthesized compound induces a mutation in the bacteria. B. The bacteria no longer produce histidine. C. The bacteria produce histidine. D. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine. E. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
A genetic signature for positive selection is
A) a gene sequence present in humans and other primates, but with at least one amino acid difference in the encoded protein in humans. B) a gene that is unique to humans. C) a gene sequence present in humans and other primates, but with no amino acid sequence differences. D) a gene that encodes a protein that makes the individual more sexually attractive.
Long time back in history the Babylonians believed that earth was flat. Later based on scientific observations and evidence, it was found that earth was round in shape. What does that tell you about scientific knowledge?
A. Scientific knowledge is uncertain B. Scientific knowledge is mutable C. Scientific knowledge is durable D. none of the above
Sexual reproduction first evolved among the
A. amphibians. B. land-dwelling vertebrates. C. insects. D. marine organisms.