Earth formed___years ago, and life first appeared about___years ago
Fill in the blank(s) with the appropriate word(s).
Answer: 4.6 billion, 4 million
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Refer to the accompanying figure. Which one of the following is NOT a plausible hypothesis to explain the differences in caterpillar appearance observed in this population?
A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) The cooler temperatures of spring trigger the development of flowerlike caterpillars. C) Differences in air pressure, due to differences in elevation, trigger the development of different types of caterpillars. D) Differences in diet trigger the development of different types of caterpillars.
Assume that red plants crossed with white plants give rise to pink plants. Explain how to eliminate red plants if you
start with two pinks. What will be an ideal response?
A virion consists of all but the following:
a. Capsomeres b. Nucleic acids c. Ribosomes d. In some viruses a viral envelope e. Capsid
When heart muscles cells are deprived of oxygen, the heart still pumps for some time. What must the heart cells be able to do?
A. derive sufficient energy from fermentation B. remove oxygen from lactate C. transform lactate back to pyruvate D. remove lactate from the blood E. continue aerobic metabolism when skeletal muscle cannot