Which organism has the narrowest ecological niche?
A. A remora that will hitchhike on any species of shark, eating its scraps
B. A shark that will eat anything that can fit into its mouth
C. A parasitic crab that infects only sea urchins
D. A sea urchin that eats several species of algae
E. A lobster that eats any type of small, bottom-dwelling shellfish
Answer: C. A parasitic crab that infects only sea urchins
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One of the ways agricultural production of such fruits as tomatoes or cucumbers can be increased significantly is to grow them in:
A. soils rich in magnesium B. soils rich in nitrogen C. greenhouses supplied with extra carbon dioxide D. greenhouses with extra oxygen E. None of these is true
Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You
repeat Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?
a. The sun of this new planet emits different wavelengths of light than our own. b. This new organism is using yellow and green light to drive photosynthesis. c. This organism is green just like plants on Earth. d. This organism utilizes the most energy-rich photons of the spectrum. e. This new organism is using blue and red light to drive photosynthesis.
The fact that approximately 80% of the six codons that encode the amino acid leucine in yeast are UUG is an example of codon bias
Indicate whether the statement is true or false
What is the effect of surrounding a gene with insulators?
What will be an ideal response?