Meiosis can occur
a. in all sexually reproducing organisms.
b. only when an organism is diploid.
c. only in multicellular organisms.
d. only in haploid organisms.
e. only in single-celled organisms.
Ans: a. in all sexually reproducing organisms.
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Most microorganisms live in eutrophic environments.
Answer the following statement true (T) or false (F)
Which of the following statements provides evidence that organelles (e.g., mitochondria and chloroplasts) originated billions of years ago as a result of primitive eukaryotic cells engulfing free-living bacterial cells? (Choose all that apply)
A. Their DNA is usually circular. B. They have an inordinate amount of noncoding DNA. C. They do not synthesize proteins. D. Their DNA is packed as a nucleoid rather than as a chromosome.
In the mitochondria, hydrogen is actively pumped to the ____
a. inner membrane b. outer membrane c. intermembrane space
d. matrix e. cytoplasm
Competition among individuals of different species is called
A. intraspecific competition. B. resource competition. C. interspecific competition. D. commensalism. E. basal competition.