In eukaryotic cells, sequences of mRNA removed before translation are called

a. introns.
b. anticodons.
c. exons.
d. rRNA.
e. terminators.


Answer: a. introns.

Biology & Microbiology

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The two copies of each type of chromosome found in normal somatic (body) cells in an organism, throughout the cell cycle, are called:  

A.  Sister chromatids B.  Homologous chromosomes C.  Daughter chromosomes D.  Kinetochores

Biology & Microbiology

The general term for a state where two organisms live together in close association is ____

a. commensalism b. parasitism c. mutualism d. predation e. symbiosis

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Which of the following statements is true of

the proteobacteria? a. They are the most diverse group of bacteria. b. Some are photoautotrophs. c. Some are chemoautotrophs. d. Some are chemoheterotrophs. e. All of these are true

Biology & Microbiology

Consider the life cycle shown in Figure 27-2. If the boxes labeled “n” and “2n” represent multicellular structures, this life cycle could be representative of all of the following except:


a. ferns
b. club mosses.
c. horsetails.
d. hornworts.
e. algae

Biology & Microbiology