Which of the following reservoirs holds the most carbon?
A. Marine sediments
B. Ocean water
C. Plant biomass
D. The atmosphere
E. Fossil fuel
Answer: A
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A mutation is
A) a change in a DNA sequence that affects at least 90 percent of individuals in a population. B) a change in a DNA sequence that is rare in a population. C) a change in a DNA sequence that harms health. D) a type of radiation that can alter the genetic code.
Which of the following organelles has its own
DNA and ribosomes?
a. chloroplasts b. rough endoplasmic reticulum c. smooth endoplasmic reticulum d. lysosomes e. none of these organelles has its own DNA and ribosomes
The Biological Species Concept:
a) is the best and most accurate species concept. b) states that species that live together will eventually start breeding. c) states that a species is any group which shares similar DNA. d) states that any organisms that are biologically similar constitute a species. e) defines a species as any group of actually or potentially interbreeding species that produce viable offspring.
Which pattern best characterizes the history of extinctions on Earth?
A. An increasing per capita background extinction rate B. Five major mass extinctions and several lesser episodes of heightened extinction rates C. Three major mass extinctions and several lesser episodes of heightened extinction rates D. Three major mass extinctions and a low background extinction rate E. An increase in the number of mass extinctions over time