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.
Answer: D
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You have two populations of flowering plants. In these populations floral color is controlled by one gene. The red gene (R) is dominant to the white gene (r). In population one, 75% of the flowers are red, in population two 25% of the flowers are white
Assuming H-W, which population has a greater frequency of the R allele? A. population 1 B. population 2 C. Neither; they both have the same frequency.
What is the current status of the Human Genome Project? What will be an ideal response?
If red flowers (R) is dominant over white flowers (r), plants with rr ____
a. are heterozygous b. are homozygous recessive c. have red flowers d. have white flowers e. have pink flowers
A friend asks you a question after your biology class. "What's genetic engineering?" What is your answer?
A. "Genetic engineering is moving genes from one organism to another." B. "Genetic engineering is removing structural components, for example a lysosome, from one part of a cell and placing those structures elsewhere in that cell." C. "Genetic engineering is the ability of scientists to remove a nucleus from a cell and place it into another cell." D. "Genetic engineering is taking proteins from one organism and placing them into another organism of a different species."