In addition to mutation, what other mechanism allows for new genetic information to be introduced into a population? Explain your answer.
What will be an ideal response?
The other mechanism is gene flow. Mutations introduce new genes into a population by changing the DNA in a gene. Gene flow does it by new organisms immigrating into a population and interbreeding with old members.
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A scientist has been growing a bacterial strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. What has caused this strange result?
A. a prophage switched from the lysogenic cycle to the lytic cyle B. a prophage switched from the lytic cycle to the lysogenic cycle C. the bacteria are infected with a temperate phage D. the bacteria are infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle E. the bacteria are infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle
Phytochrome is converted from the inactive to the active form by being exposed to light of what color?
a. far red b. red c. yellow d. white e. blue
The embryonic root tip is indicated by the letter ____
a. A b. B c. C d. D e. E
This image depicts the concept of
1.the chemical reaction of antioxidants.
2.a protein being built as peptide bonds form between amino acids.
3.DNA being built as peptide bonds form between amino acids.
4.all of the choices