Reptiles dominated the:a
Proterozoic era.
b. Paleozoic era.
c. Mesozoic era.
d. Cenozoic era.
e. Triassic era
C
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Nitrogen-fixing bacteria convert atmospheric nitrogen (N2 gas) into ammonium (NH4). Why is this conversion important for life on Earth?
A. Nitrogen gas is toxic. B. Ammonium is an important cleaning agent. C. Nitrogen gas leads to global warming. D. Ammonium is a very important plant nutrient.
Which of the following enzymes join the paired
sticky ends of DNA fragments? a. reverse transcriptases b. restriction enzymes c. DNA ligases d. DNA polymerases e. polynucleotide kinases
Which statement about kudzu is FALSE?
A. It was imported from Asia for erosion control and forage. B. It was originally introduced into the Pacific Northwest. C. It is an exotic species. D. It grows over most anything stationary in its path. E. It is a vine.
Insect workers propagate more of their own alleles by helping their mother reproduce rather than by reproducing themselves; thus, they share a larger fraction of their ________ with the next generation.
A. ability to defend their nest B. home C. time D. food resources E. genome