The unicellular alga Chlamydomonas
a. lacks an asexual stage.
b. lacks a sexual stage.
c. lacks a haploid and a diploid phase.
d. possesses both a haploid and a diploid phase.
e. produces thick-walled resistant spores.
Answer: d
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Tropical biomes have evolved over _____ years. Biomes at higher latitudes have experienced an ice age within the past _____ years
A. a few million years; few million B. a few million Syears; thousand C. tens of millions of; few million D. several thousand; few million E. few thousand; few thousand
The three components that interact for one health are
A. producers, consumers, and decomposers. B. bacteria, archaea, and eukaryotes. C. prokaryotes, eukaryotes, and viruses. D. the environment, humans, and animals.
The first cells were formed approximately ___________ years ago.
a. 3 million years ago b. 3 billion years ago c. 2 billion years ago
Why is a heat-stable DNA polymerase from a thermophilic bacterium (the Taq polymerase) used in the polymerase chain reaction rather than a DNA polymerase from E. coli or humans?
What will be an ideal response?