Conjugation, transduction, and transformation are the three main mechanisms for gene transfer
between bacteria. Compare these three mechanisms in terms of how DNA is transferred.
What will be an ideal response?
Conjugation involves the transfer of DNA from one bacterium to another via direct contact.
Transduction is when a virus accidentally packages some bacterial DNA into its capsid before
infecting another bacterial cell and depositing that bacterial DNA into the second cell. Transformation
is simply the uptake of naked bacterial DNA from the medium by another cell.
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Green sulfur bacteria are often found at the greatest depths of all phototrophic cells in lakes, oceans, and microbial mats. This is because green sulfur bacteria
A) are very sensitive to UV irradiation, despite their reliance on light for energy. B) are the only phototrophs that can use hydrogen sulfide as an electron donor for photosynthesis. C) are strict anaerobes. D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low.
What is the relationship between the narrow-sense heritability (h2 ) index and the impact of selection?
What will be an ideal response?
An example of a freshwater wetland is a(n) estuary. Indicate whether the statement is true or false
The information that determines what an organism will be like is stored in the ________ molecule.
Fill in the blank(s) with the appropriate word(s).