The cilia and flagella of eukaryotic cells are composed of _____.
a) pili
b) tonofilaments
c) microfilaments
d) intermediate filaments
e) microtubules
Ans: e) microtubules
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. The structure labeled "D" is the ____
a. aorta b. right atrium c. left atrium d. trunk of the pulmonary arteries e. superior vena cava
The ancestors of modern ________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
A. Firmicutes B. Cyanobacteria C. Crenarchaeota D. Proteobacteria
Nitrogen-fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants, and in exchange, the bacteria obtain food from the plants. Which reaction can these bacteria catalyze?
A. nitrogen gas (N2) to nitrate (NO3) B. ammonium (NH4+) to nitrate (NO3) C. nitrogen gas (N2) to ammonium (NH4+) D. nitrate (NO3) to ammonium (NH4+) E. nitrate (NO3) to nitrogen gas (N2)
In humans, widow's peak (W) is dominant over straight hairline (w). If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?
a) can't be determined b) 25% c) 0% d) 100% e) 50%