Living organisms are categorized into two major groups based on the presence or absence of a nucleus. What group is defined by the presence of a nucleus?
A) mitochondrial organism
B) eukaryotic organism
C) prokaryotic organism
D) bacterium
E) virus
B
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Which category had the highest amount of endangered species in 2012?
a. amphibians b. insects c. mammals d. plants
During bacterial conjugation, bacteria use a long tubular structure called a(n) ____ to contact each other
a. metabolic pilus b. asexual pilus c. flagellum d. cilia e. sex pilus
In animal skeletal muscles, white muscle fibers
a. have an abundance of myoglobin. b. make ATP by lactate fermentation. c. produce ethanol. d. are good for sustained activities. e. are not found in chickens
The extinction that occurred on earth 65 million years ago was immediately followed by:
a. an increase in atmospheric oxygen levels. b. the rise of archaea. c. the emergence of the first non-photosynthetic organisms. d. the rise of reptiles, including the dinosaurs. e. the rapid divergence and radiation of modern mammals.