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 appears 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.
ANSWER: b
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The ancestral lung of fish has developed into a unique structure used for another important function. What is this function?
a. respiration b. buoyancy c. lymph circulation d. excretion of uric acid e. excretion of urea
Despite evidence to the contrary, many scientists during the mid-twentieth century remained convinced that
____________________ were the carrier of genetic information. Fill in the blank(s) with the appropriate word(s).
Integuments develop into the megasporangium
____________________ Indicate whether the statement is true or false.
All the following are important functions of the cytoskeleton EXCEPT
A) maintenance of organization in the cell. B) movement of organelles. C) maintenance of shape. D) storage of food molecules. E) assistance during cell division.