Equilibrium theories of species diversity have been applied to islands and to larger, continental regions. Which of the following processes is likely to play a greater role in the determination of equilibrium diversity in a continental region?
A) extinction of species
B) immigration of species from elsewhere
C) formation of new species
Ans: C) formation of new species
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Most prokaryotic cells reside
A) on Earth's surface. B) in lakes, rivers, and oceans. C) in and on nonprokaryotic organisms (including humans and other animals). D) in the oceanic and terrestrial subsurfaces.
DNA is associated with proteins, forming a complex called:a
chromosomes. b. nucleoli. c. nucleus. d. genes. e. chromatin.
Which statement is not true about eukaryotic ribosomes?
A) Ribosomes found in mitochondria are 70S rather than the 80S type found in the cytoplasm. B) Both bound and free ribosomes consist of a 40S and a 60S subunit. C) Bound ribosomes produce proteins that are destined for secretion from the cell. D) Bound ribosomes are attached to the endoplasmic reticulum (ER). E) Bound ribosomes are always bound while free ribosomes are always free.
The first group to have mitosis was the _______.
a. Archae b. Bacteria c. Protista d. Fungi