What important feature(s) of noncovalent bonds makes them so important to life?
A. They are strong bonds that hold atoms together tightly in cells.
B. They are weak in a cellular environment so they can be made, broken, and reformed easily.
C. They can only occur in cells.
D. Both a & c.
E. Both b & c.
Answer B
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Degradation of organic matter is influenced by ________.
A. nutrient availability B. the nature of the microbial community present C. abiotic conditions D. All of the choices are correct.
Fuels used in cars, and the carbon dioxide cars emit, were originally carbon dioxide
A. fixed by vascular and nonvascular plants during photosynthesis about 300 mya. B. fixed in the tissues, decayed from dinosaurs after the Cretaceous mass extinction. C. released from volcanoes, and accumulated over centuries. D. trapped in rocks and compressed into oil and coal, during the Precambrian. E. trapped in the ocean and secreted into large coral reef structures, during the Mesozoic.
Mendel crossed yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 generation. The results were as follows: 6022 yellow and 2001 green (8023 total)
The allele for green seeds has what relationship to the allele for yellow seeds? A) dominant B) incomplete dominant C) recessive D) codominant
Sulfolobus are archaea that are commonly found in geothermal environments, with an optimum growth temperature of about 80°C. What feature allows archaea to thrive at such temperatures?
A. Archaea are highly adaptable to changing environmental temperatures. B. Archaeal membranes contain special lipids. C. Archaea use the heat from their environment to produce ATP. D. Archaea have two cell walls that helps prevent heat absorption.